typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // ...
}

 {
    // ...
}

typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // ...
}

 {
    // ...
}

typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // ...
}

 {
    // ...
}

typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // ...
}

 {
    // ...
}

typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // ...
}

 {
    // ...
}

typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // ...
}

 {
    // ...
}

typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // ...
}

 {
    // ...
}

typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // ...
}

 {
    // ...
}

typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // ...
}

 {
    // ...
}

typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // ...
}

 {
    // ...
}

indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case .text(let content):
        return content
    case .element(let name, let attributes, let children):
        var html = "<" + name
        for (key, value) in attributes {
            html += " " + key + "=\"" + value + "\""
        }
        html += ">"
        for child in children {
            html += generate(child)
        }
        html += "</" + name + ">"
        return html
    }
}

 {
    switch tree {
    case .text(let content):
        return content
    case .element(let name, let attributes, let children):
        var html = "<" + name
        for (key, value) in attributes {
            html += " " + key + "=\"" + value + "\""
        }
        html += ">"
        for child in children {
            html += generate(child)
        }
        html += "</" + name + ">"
        return html
    }
}

indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case .text(let content):
        return content
    case .element(let name, let attributes, let children):
        var result = "<" + name
        for (key, value) in attributes {
            result += " " + key + "=\"" + value + "\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</" + name + ">"
        return result
    }
}

 {
    switch tree {
    case .text(let content):
        return content
    case .element(let name, let attributes, let children):
        var result = "<" + name
        for (key, value) in attributes {
            result += " " + key + "=\"" + value + "\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</" + name + ">"
        return result
    }
}

indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case .text(let content):
        return content
    case .element(let name, let attributes, let children):
        var result = "<" + name
        for (key, value) in attributes {
            result += " " + key + "=\"" + value + "\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</" + name + ">"
        return result
    }
}

 {
    switch tree {
    case .text(let content):
        return content
    case .element(let name, let attributes, let children):
        var result = "<" + name
        for (key, value) in attributes {
            result += " " + key + "=\"" + value + "\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</" + name + ">"
        return result
    }
}

indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case .text(let content):
        return content
    case .element(let name, let attributes, let children):
        var result = "<" + name
        for (key, value) in attributes {
            result += " " + key + "=\"" + value + "\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</" + name + ">"
        return result
    }
}

 {
    switch tree {
    case .text(let content):
        return content
    case .element(let name, let attributes, let children):
        var result = "<" + name
        for (key, value) in attributes {
            result += " " + key + "=\"" + value + "\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</" + name + ">"
        return result
    }
}

indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case .text(let content):
        return content
    case .element(let name, let attributes, let children):
        var result = "<" + name
        for (key, value) in attributes {
            result += " " + key + "=\"" + value + "\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</" + name + ">"
        return result
    }
}

 {
    switch tree {
    case .text(let content):
        return content
    case .element(let name, let attributes, let children):
        var result = "<" + name
        for (key, value) in attributes {
            result += " " + key + "=\"" + value + "\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</" + name + ">"
        return result
    }
}

indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case .text(let content):
        return content
    case .element(let name, let attributes, let children):
        var result = "<" + name
        for (key, value) in attributes {
            result += " " + key + "=\"" + value + "\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</" + name + ">"
        return result
    }
}

 {
    switch tree {
    case .text(let content):
        return content
    case .element(let name, let attributes, let children):
        var result = "<" + name
        for (key, value) in attributes {
            result += " " + key + "=\"" + value + "\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</" + name + ">"
        return result
    }
}

indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case .text(let content):
        return content
    case .element(let name, let attributes, let children):
        var result = "<" + name
        for (key, value) in attributes {
            result += " " + key + "=\"" + value + "\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</" + name + ">"
        return result
    }
}

 {
    switch tree {
    case .text(let content):
        return content
    case .element(let name, let attributes, let children):
        var result = "<" + name
        for (key, value) in attributes {
            result += " " + key + "=\"" + value + "\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</" + name + ">"
        return result
    }
}

indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case .text(let content):
        return content
    case .element(let name, let attributes, let children):
        var result = "<" + name
        for (key, value) in attributes {
            result += " " + key + "=\"" + value + "\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</" + name + ">"
        return result
    }
}

 {
    switch tree {
    case .text(let content):
        return content
    case .element(let name, let attributes, let children):
        var result = "<" + name
        for (key, value) in attributes {
            result += " " + key + "=\"" + value + "\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</" + name + ">"
        return result
    }
}

indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case .text(let content):
        return content
    case .element(let name, let attributes, let children):
        var result = "<" + name
        for (key, value) in attributes {
            result += " " + key + "=\"" + value + "\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</" + name + ">"
        return result
    }
}

 {
    switch tree {
    case .text(let content):
        return content
    case .element(let name, let attributes, let children):
        var result = "<" + name
        for (key, value) in attributes {
            result += " " + key + "=\"" + value + "\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</" + name + ">"
        return result
    }
}

indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case .text(let content):
        return content
    case .element(let name, let attributes, let children):
        var result = "<" + name
        for (key, value) in attributes {
            result += " " + key + "=\"" + value + "\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</" + name + ">"
        return result
    }
}

 {
    switch tree {
    case .text(let content):
        return content
    case .element(let name, let attributes, let children):
        var result = "<" + name
        for (key, value) in attributes {
            result += " " + key + "=\"" + value + "\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</" + name + ">"
        return result
    }
}

enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    // Your code goes here
}

 {
    // Your code goes here
}

enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    // your code goes here
}

 {
    // your code goes here
}

enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    // TODO: implement me
}

 {
    // TODO: implement me
}

enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    // TODO: implement me
}

 {
    // TODO: implement me
}

enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    // TODO: implement me
}

 {
    // TODO: implement me
}

enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    // TODO: implement me
}

 {
    // TODO: implement me
}

enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    // your implementation
}

 {
    // your implementation
}

enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    // your implementation here
}

 {
    // your implementation here
}

enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    // your code here
}

 {
    // your code here
}

enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    // your code goes here
}

 {
    // your code goes here
}

func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
    var cache = [T: U]()
    return { input in
        if let output = cache[input] {
            return output
        }
        let output = function(input)
        cache[input] = output
        return output
    }
}

 {
    var cache = [T: U]()
    return { input in
        if let output = cache[input] {
            return output
        }
        let output = function(input)
        cache[input] = output
        return output
    }
}

func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
    var cache = [T: U]()
    return { input in
        if let result = cache[input] {
            return result
        } else {
            let result = function(input)
            cache[input] = result
            return result
        }
    }
}

 {
    var cache = [T: U]()
    return { input in
        if let result = cache[input] {
            return result
        } else {
            let result = function(input)
            cache[input] = result
            return result
        }
    }
}

func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
    var cache = [T: U]()
    return { input in
        if let output = cache[input] {
            return output
        }
        let output = function(input)
        cache[input] = output
        return output
    }
}

 {
    var cache = [T: U]()
    return { input in
        if let output = cache[input] {
            return output
        }
        let output = function(input)
        cache[input] = output
        return output
    }
}

func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
    var cache = [T: U]()
    return { input in
        if let output = cache[input] {
            return output
        } else {
            let output = function(input)
            cache[input] = output
            return output
        }
    }
}

 {
    var cache = [T: U]()
    return { input in
        if let output = cache[input] {
            return output
        } else {
            let output = function(input)
            cache[input] = output
            return output
        }
    }
}

func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
    var cache = [T: U]()
    return { (input: T) -> U in
        if let output = cache[input] {
            return output
        } else {
            let output = function(input)
            cache[input] = output
            return output
        }
    }
}

 {
    var cache = [T: U]()
    return { (input: T) -> U in
        if let output = cache[input] {
            return output
        } else {
            let output = function(input)
            cache[input] = output
            return output
        }
    }
}

func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
    var cache: [T: U] = [:]
    return { (input: T) -> U in
        if let result = cache[input] {
            return result
        } else {
            let result = function(input)
            cache[input] = result
            return result
        }
    }
}

 {
    var cache: [T: U] = [:]
    return { (input: T) -> U in
        if let result = cache[input] {
            return result
        } else {
            let result = function(input)
            cache[input] = result
            return result
        }
    }
}

func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
    var cache = [T: U]()
    return { input in
        if let output = cache[input] {
            return output
        } else {
            let output = function(input)
            cache[input] = output
            return output
        }
    }
}

 {
    var cache = [T: U]()
    return { input in
        if let output = cache[input] {
            return output
        } else {
            let output = function(input)
            cache[input] = output
            return output
        }
    }
}

func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
    var cache: [T: U] = [:]
    return { input in
        if let result = cache[input] {
            return result
        } else {
            let result = function(input)
            cache[input] = result
            return result
        }
    }
}

 {
    var cache: [T: U] = [:]
    return { input in
        if let result = cache[input] {
            return result
        } else {
            let result = function(input)
            cache[input] = result
            return result
        }
    }
}

func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
    var cache: [T: U] = [:]
    return { input in
        if let result = cache[input] {
            return result
        }
        let result = function(input)
        cache[input] = result
        return result
    }
}

 {
    var cache: [T: U] = [:]
    return { input in
        if let result = cache[input] {
            return result
        }
        let result = function(input)
        cache[input] = result
        return result
    }
}

func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
    var cache = [T: U]()
    return { (input: T) -> U in
        if let output = cache[input] {
            return output
        } else {
            let output = function(input)
            cache[input] = output
            return output
        }
    }
}

 {
    var cache = [T: U]()
    return { (input: T) -> U in
        if let output = cache[input] {
            return output
        } else {
            let output = function(input)
            cache[input] = output
            return output
        }
    }
}

func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
    var result: T?
    var error: Error?
    do {
        for _ in 0..<attempts {
            try result = try task()
            if let value = result {
                return value
            }
        }
    } catch let e as NSError {
        error = e as Error
    } catch {
        error = Error(e)
    }
    if let e = error {
        throw e
    }
    return result!
}

 {
    var result: T?
    var error: Error?
    do {
        for _ in 0..<attempts {
            try result = try task()
            if let value = result {
                return value
            }
        }
    } catch let e as NSError {
        error = e as Error
    } catch {
        error = Error(e)
    }
    if let e = error {
        throw e
    }
    return result!
}

func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
    var result: T?
    var error: Error?
    do {
        for _ in 0..<attempts {
            try result = try task()
            if let value = result {
                return value
            }
        }
    } catch let e as NSError {
        error = e as Error
    } catch {
        error = error
    }
    
    if let e = error {
        throw e
    }
    
    return result!
}

 {
    var result: T?
    var error: Error?
    do {
        for _ in 0..<attempts {
            try result = try task()
            if let value = result {
                return value
            }
        }
    } catch let e as NSError {
        error = e as Error
    } catch {
        error = error
    }
    
    if let e = error {
        throw e
    }
    
    return result!
}

func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
    var result: T?
    var error: Error?
    do {
        for _ in 0..<attempts {
            try result = try task()
            if let value = result {
                return value
            }
        }
    } catch let e as NSError {
        error = e as Error
    } catch {
        error = Error(e)
    }
    if let e = error {
        throw e
    }
    return result!
}

 {
    var result: T?
    var error: Error?
    do {
        for _ in 0..<attempts {
            try result = try task()
            if let value = result {
                return value
            }
        }
    } catch let e as NSError {
        error = e as Error
    } catch {
        error = Error(e)
    }
    if let e = error {
        throw e
    }
    return result!
}

func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
    var result: T?
    var error: Error?
    do {
        result = try task()
    } catch let e {
        error = e
    }
    for _ in 0..<attempts {
        if let res = result {
            return res
        }
        if let e = error {
            error = nil
            do {
                result = try task()
            } catch let e {
                error = e
            }
        }
    }
    if let e = error {
        throw e
    }
    return result!
}

 {
    var result: T?
    var error: Error?
    do {
        result = try task()
    } catch let e {
        error = e
    }
    for _ in 0..<attempts {
        if let res = result {
            return res
        }
        if let e = error {
            error = nil
            do {
                result = try task()
            } catch let e {
                error = e
            }
        }
    }
    if let e = error {
        throw e
    }
    return result!
}

func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
    var result: T?
    var error: Error?
    do {
        result = try task()
    } catch let e {
        error = e
    }
    for _ in 0..<attempts {
        if let res = result {
            return res
        }
        if let e = error {
            error = nil
            do {
                result = try task()
            } catch let e {
                error = e
            }
        }
    }
    if let e = error {
        throw e
    }
    return result!
}

 {
    var result: T?
    var error: Error?
    do {
        result = try task()
    } catch let e {
        error = e
    }
    for _ in 0..<attempts {
        if let res = result {
            return res
        }
        if let e = error {
            error = nil
            do {
                result = try task()
            } catch let e {
                error = e
            }
        }
    }
    if let e = error {
        throw e
    }
    return result!
}

func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
    var result: T?
    var error: Error?
    do {
        result = try task()
    } catch {
        error = error
    }
    for _ in 0..<attempts {
        guard let res = result else {
            try Thread.sleep(for: .seconds(1))
            continue
        }
        return res
    }
    throw error!
}

 {
    var result: T?
    var error: Error?
    do {
        result = try task()
    } catch {
        error = error
    }
    for _ in 0..<attempts {
        guard let res = result else {
            try Thread.sleep(for: .seconds(1))
            continue
        }
        return res
    }
    throw error!
}

func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
    var result: T?
    var error: Error?
    for _ in 0..<attempts {
        do {
            result = try task()
            break
        } catch let e as Error {
            error = e
        }
    }
    if let e = error {
        throw e
    }
    return result!
}

 {
    var result: T?
    var error: Error?
    for _ in 0..<attempts {
        do {
            result = try task()
            break
        } catch let e as Error {
            error = e
        }
    }
    if let e = error {
        throw e
    }
    return result!
}

func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
    var result: T?
    var error: Error?
    do {
        for _ in 1...attempts {
            result = try task()
            if let result = result {
                return result
            }
        }
    } catch let error1 as Error {
        error = error1
    }
    
    if let error = error {
        throw error
    }
    
    return result!
}

 {
    var result: T?
    var error: Error?
    do {
        for _ in 1...attempts {
            result = try task()
            if let result = result {
                return result
            }
        }
    } catch let error1 as Error {
        error = error1
    }
    
    if let error = error {
        throw error
    }
    
    return result!
}

func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
    var result: T?
    var error: Error?
    for _ in 0..<attempts {
        do {
            result = try task()
        } catch let e {
            error = e
        }
        if let r = result {
            return r
        }
    }
    throw error!
}

 {
    var result: T?
    var error: Error?
    for _ in 0..<attempts {
        do {
            result = try task()
        } catch let e {
            error = e
        }
        if let r = result {
            return r
        }
    }
    throw error!
}

func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
    var result: T?
    var error: Error?
    do {
        result = try task()
    } catch let e {
        error = e
    }
    for _ in 0..<attempts {
        if let res = result {
            return res
        }
        if let e = error {
            error = nil
            do {
                result = try task()
            } catch let e {
                error = e
            }
        }
    }
    if let e = error {
        throw e
    }
    return result!
}

 {
    var result: T?
    var error: Error?
    do {
        result = try task()
    } catch let e {
        error = e
    }
    for _ in 0..<attempts {
        if let res = result {
            return res
        }
        if let e = error {
            error = nil
            do {
                result = try task()
            } catch let e {
                error = e
            }
        }
    }
    if let e = error {
        throw e
    }
    return result!
}

protocol DIContainerProtocol {
    func register<T>(_ type: T.Type, factory: @escaping () -> T)
    func resolve<T>(_ type: T.Type) -> T?
}

class DIContainer: DIContainerProtocol {
    func register<T>(_ type: T.Type, factory: @escaping () -> T) {
        // ...
    }
    
    func resolve<T>(_ type: T.Type) -> T? {
        // ...
    }
}

 DIContainerProtocol {
    func register<T>(_ type: T.Type, factory: @escaping () -> T) {
        // ...
    }
    
    func resolve<T>(_ type: T.Type) -> T? {
        // ...
    }
}

protocol DIContainerProtocol {
    func register<T>(_ type: T.Type, factory: @escaping () -> T)
    func resolve<T>(_ type: T.Type) -> T?
}

class DIContainer: DIContainerProtocol {
    func register<T>(_ type: T.Type, factory: @escaping () -> T) {
        // ...
    }

    func resolve<T>(_ type: T.Type) -> T? {
        // ...
    }
}

 DIContainerProtocol {
    func register<T>(_ type: T.Type, factory: @escaping () -> T) {
        // ...
    }

    func resolve<T>(_ type: T.Type) -> T? {
        // ...
    }
}

protocol DIContainerProtocol {
    func register<T>(_ type: T.Type, factory: @escaping () -> T)
    func resolve<T>(_ type: T.Type) -> T?
}

class DIContainer: DIContainerProtocol {
    private var registry: [String: (() -> Any)] = [:]
    
    func register<T>(_ type: T.Type, factory: @escaping () -> T) {
        registry[String(describing: type)] = { factory() }
    }
    
    func resolve<T>(_ type: T.Type) -> T? {
        guard let value = registry[String(describing: type)] else { return nil }
        return value() as? T
    }
}

 DIContainerProtocol {
    private var registry: [String: (() -> Any)] = [:]
    
    func register<T>(_ type: T.Type, factory: @escaping () -> T) {
        registry[String(describing: type)] = { factory() }
    }
    
    func resolve<T>(_ type: T.Type) -> T? {
        guard let value = registry[String(describing: type)] else { return nil }
        return value() as? T
    }
}

protocol DIContainerProtocol {
    func register<T>(_ type: T.Type, factory: @escaping () -> T)
    func resolve<T>(_ type: T.Type) -> T?
}

class DIContainer: DIContainerProtocol {
    private var registrations = [String: () -> Any]()
    
    func register<T>(_ type: T.Type, factory: @escaping () -> T) {
        registrations[String(describing: type)] = { factory() }
    }
    
    func resolve<T>(_ type: T.Type) -> T? {
        guard let factory = registrations[String(describing: type)] else {
            return nil
        }
        return factory() as? T
    }
}

 DIContainerProtocol {
    private var registrations = [String: () -> Any]()
    
    func register<T>(_ type: T.Type, factory: @escaping () -> T) {
        registrations[String(describing: type)] = { factory() }
    }
    
    func resolve<T>(_ type: T.Type) -> T? {
        guard let factory = registrations[String(describing: type)] else {
            return nil
        }
        return factory() as? T
    }
}

protocol DIContainerProtocol {
    func register<T>(_ type: T.Type, factory: @escaping () -> T)
    func resolve<T>(_ type: T.Type) -> T?
}

class DIContainer: DIContainerProtocol {
    private var registrations: [String: (() -> Any)] = [:]
    
    func register<T>(_ type: T.Type, factory: @escaping () -> T) {
        registrations[String(describing: type)] = { factory() }
    }
    
    func resolve<T>(_ type: T.Type) -> T? {
        guard let registration = registrations[String(describing: type)] else { return nil }
        return registration() as? T
    }
}

 DIContainerProtocol {
    private var registrations: [String: (() -> Any)] = [:]
    
    func register<T>(_ type: T.Type, factory: @escaping () -> T) {
        registrations[String(describing: type)] = { factory() }
    }
    
    func resolve<T>(_ type: T.Type) -> T? {
        guard let registration = registrations[String(describing: type)] else { return nil }
        return registration() as? T
    }
}

protocol DIContainerProtocol {
    func register<T>(_ type: T.Type, factory: @escaping () -> T)
    func resolve<T>(_ type: T.Type) -> T?
}

class DIContainer: DIContainerProtocol {
    private var registrations: [String: (() -> Any)] = [:]
    
    func register<T>(_ type: T.Type, factory: @escaping () -> T) {
        registrations[String(describing: type)] = { factory() }
    }
    
    func resolve<T>(_ type: T.Type) -> T? {
        if let registration = registrations[String(describing: type)] {
            return registration() as? T
        }
        return nil
    }
}

 DIContainerProtocol {
    private var registrations: [String: (() -> Any)] = [:]
    
    func register<T>(_ type: T.Type, factory: @escaping () -> T) {
        registrations[String(describing: type)] = { factory() }
    }
    
    func resolve<T>(_ type: T.Type) -> T? {
        if let registration = registrations[String(describing: type)] {
            return registration() as? T
        }
        return nil
    }
}

protocol DIContainerProtocol {
    func register<T>(_ type: T.Type, factory: @escaping () -> T)
    func resolve<T>(_ type: T.Type) -> T?
}

class DIContainer: DIContainerProtocol {
    var registrations: [String: (() -> Any)] = [:]
    
    func register<T>(_ type: T.Type, factory: @escaping () -> T) {
        registrations[String(describing: type)] = { factory() }
    }
    
    func resolve<T>(_ type: T.Type) -> T? {
        guard let factory = registrations[String(describing: type)] else {
            return nil
        }
        return factory() as? T
    }
}

 DIContainerProtocol {
    var registrations: [String: (() -> Any)] = [:]
    
    func register<T>(_ type: T.Type, factory: @escaping () -> T) {
        registrations[String(describing: type)] = { factory() }
    }
    
    func resolve<T>(_ type: T.Type) -> T? {
        guard let factory = registrations[String(describing: type)] else {
            return nil
        }
        return factory() as? T
    }
}

protocol DIContainerProtocol {
    func register<T>(_ type: T.Type, factory: @escaping () -> T)
    func resolve<T>(_ type: T.Type) -> T?
}

class DIContainer: DIContainerProtocol {
    private var registrations: [String: () -> Any] = [:]
    
    func register<T>(_ type: T.Type, factory: @escaping () -> T) {
        registrations[String(describing: type)] = { factory() }
    }
    
    func resolve<T>(_ type: T.Type) -> T? {
        if let registration = registrations[String(describing: type)] {
            return registration() as? T
        }
        return nil
    }
}

 DIContainerProtocol {
    private var registrations: [String: () -> Any] = [:]
    
    func register<T>(_ type: T.Type, factory: @escaping () -> T) {
        registrations[String(describing: type)] = { factory() }
    }
    
    func resolve<T>(_ type: T.Type) -> T? {
        if let registration = registrations[String(describing: type)] {
            return registration() as? T
        }
        return nil
    }
}

protocol DIContainerProtocol {
    func register<T>(_ type: T.Type, factory: @escaping () -> T)
    func resolve<T>(_ type: T.Type) -> T?
}

class DIContainer: DIContainerProtocol {
    private var registrations: [String: Any] = [:]
    
    func register<T>(_ type: T.Type, factory: @escaping () -> T) {
        registrations[String(describing: type)] = factory
    }
    
    func resolve<T>(_ type: T.Type) -> T? {
        guard let value = registrations[String(describing: type)] as? () -> T else {
            return nil
        }
        
        return value()
    }
}

 DIContainerProtocol {
    private var registrations: [String: Any] = [:]
    
    func register<T>(_ type: T.Type, factory: @escaping () -> T) {
        registrations[String(describing: type)] = factory
    }
    
    func resolve<T>(_ type: T.Type) -> T? {
        guard let value = registrations[String(describing: type)] as? () -> T else {
            return nil
        }
        
        return value()
    }
}

protocol DIContainerProtocol {
    func register<T>(_ type: T.Type, factory: @escaping () -> T)
    func resolve<T>(_ type: T.Type) -> T?
}

class DIContainer: DIContainerProtocol {
    private var registrations: [String: Any] = [:]
    
    func register<T>(_ type: T.Type, factory: @escaping () -> T) {
        registrations[String(describing: type)] = factory
    }
    
    func resolve<T>(_ type: T.Type) -> T? {
        guard let factory = registrations[String(describing: type)] as? () -> T else {
            return nil
        }
        return factory()
    }
}

 DIContainerProtocol {
    private var registrations: [String: Any] = [:]
    
    func register<T>(_ type: T.Type, factory: @escaping () -> T) {
        registrations[String(describing: type)] = factory
    }
    
    func resolve<T>(_ type: T.Type) -> T? {
        guard let factory = registrations[String(describing: type)] as? () -> T else {
            return nil
        }
        return factory()
    }
}

protocol StateMachineProtocol {
    associatedtype State: Hashable
    associatedtype Event: Hashable
    init(state: State)
    var state: State { get }
    func trigger(event: Event)
    func registerTransition(from: State, to: State, event: Event)
}

class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
    var state: State
    var transitions: [State: [Event: State]] = [:]
    
    init(state: State) {
        self.state = state
    }
    
    func trigger(event: Event) {
        if let to = transitions[state]?[event] {
            state = to
        }
    }
    
    func registerTransition(from: State, to: State, event: Event) {
        if let transitions = transitions[from] {
            transitions[event] = to
        } else {
            transitions[event] = to
        }
    }
}

State: Hashable, Event: Hashable>: StateMachineProtocol {
    var state: State
    var transitions: [State: [Event: State]] = [:]
    
    init(state: State) {
        self.state = state
    }
    
    func trigger(event: Event) {
        if let to = transitions[state]?[event] {
            state = to
        }
    }
    
    func registerTransition(from: State, to: State, event: Event) {
        if let transitions = transitions[from] {
            transitions[event] = to
        } else {
            transitions[event] = to
        }
    }
}

protocol StateMachineProtocol {
    associatedtype State: Hashable
    associatedtype Event: Hashable
    init(state: State)
    var state: State { get }
    func trigger(event: Event)
    func registerTransition(from: State, to: State, event: Event)
}

class StateMachine<State: Hashable, Event: Hashable> {
    var state: State
    var transitions: [State: [Event: State]] = [:]
    init(state: State) {
        self.state = state
    }
    func trigger(event: Event) {
        if let to = transitions[state][event] {
            state = to
        }
    }
    func registerTransition(from: State, to: State, event: Event) {
        if let transitions = transitions[from] {
            transitions[event] = to
        } else {
            transitions[event] = to
        }
    }
}

State: Hashable, Event: Hashable> {
    var state: State
    var transitions: [State: [Event: State]] = [:]
    init(state: State) {
        self.state = state
    }
    func trigger(event: Event) {
        if let to = transitions[state][event] {
            state = to
        }
    }
    func registerTransition(from: State, to: State, event: Event) {
        if let transitions = transitions[from] {
            transitions[event] = to
        } else {
            transitions[event] = to
        }
    }
}

protocol StateMachineProtocol {
    associatedtype State: Hashable
    associatedtype Event: Hashable
    init(state: State)
    var state: State { get }
    func trigger(event: Event)
    func registerTransition(from: State, to: State, event: Event)
}

class StateMachine<State: Hashable, Event: Hashable> {
    var state: State
    var transitions: [State: [State: [Event: State]]] = [:]
    init(state: State) {
        self.state = state
    }
    func trigger(event: Event) {
        if let transition = transitions[state][event] {
            self.state = transition
        }
    }
    func registerTransition(from: State, to: State, event: Event) {
        if let transition = transitions[from] {
            transition[event] = to
        } else {
            transitions[from] = [event: to]
        }
    }
}

State: Hashable, Event: Hashable> {
    var state: State
    var transitions: [State: [State: [Event: State]]] = [:]
    init(state: State) {
        self.state = state
    }
    func trigger(event: Event) {
        if let transition = transitions[state][event] {
            self.state = transition
        }
    }
    func registerTransition(from: State, to: State, event: Event) {
        if let transition = transitions[from] {
            transition[event] = to
        } else {
            transitions[from] = [event: to]
        }
    }
}

protocol StateMachineProtocol {
    associatedtype State: Hashable
    associatedtype Event: Hashable
    init(state: State)
    var state: State { get }
    func trigger(event: Event)
    func registerTransition(from: State, to: State, event: Event)
}

class StateMachine<State: Hashable, Event: Hashable> {
    private var state: State
    private var transitions: [State: [State: [Event: State]]] = [:]
    
    init(state: State) {
        self.state = state
    }
    
    var state: State {
        get {
            return state
        }
    }
    
    func trigger(event: Event) {
        if let nextState = transitions[state][event] {
            state = nextState
        }
    }
    
    func registerTransition(from: State, to: State, event: Event) {
        if let transitions = transitions[from] {
            transitions[event] = to
        } else {
            transitions[event] = to
        }
    }
}

State: Hashable, Event: Hashable> {
    private var state: State
    private var transitions: [State: [State: [Event: State]]] = [:]
    
    init(state: State) {
        self.state = state
    }
    
    var state: State {
        get {
            return state
        }
    }
    
    func trigger(event: Event) {
        if let nextState = transitions[state][event] {
            state = nextState
        }
    }
    
    func registerTransition(from: State, to: State, event: Event) {
        if let transitions = transitions[from] {
            transitions[event] = to
        } else {
            transitions[event] = to
        }
    }
}

protocol StateMachineProtocol {
    associatedtype State: Hashable
    associatedtype Event: Hashable
    init(state: State)
    var state: State { get }
    func trigger(event: Event)
    func registerTransition(from: State, to: State, event: Event)
}

class StateMachine<State: Hashable, Event: Hashable> {
    private var state: State
    private var transitions: [State: [State: [Event: State]]] = [:]
    
    init(state: State) {
        self.state = state
    }
    
    var state: State {
        get {
            return state
        }
    }
    
    func trigger(event: Event) {
        if let transition = transitions[state][event] {
            state = transition
        }
    }
    
    func registerTransition(from: State, to: State, event: Event) {
        if let transition = transitions[from] {
            transition[event] = to
        } else {
            transitions[from] = [event: to]
        }
    }
}

State: Hashable, Event: Hashable> {
    private var state: State
    private var transitions: [State: [State: [Event: State]]] = [:]
    
    init(state: State) {
        self.state = state
    }
    
    var state: State {
        get {
            return state
        }
    }
    
    func trigger(event: Event) {
        if let transition = transitions[state][event] {
            state = transition
        }
    }
    
    func registerTransition(from: State, to: State, event: Event) {
        if let transition = transitions[from] {
            transition[event] = to
        } else {
            transitions[from] = [event: to]
        }
    }
}

protocol StateMachineProtocol {
    associatedtype State: Hashable
    associatedtype Event: Hashable
    init(state: State)
    var state: State { get }
    func trigger(event: Event)
    func registerTransition(from: State, to: State, event: Event)
}

class StateMachine<State: Hashable, Event: Hashable> {
    init(state: State) {
        self.state = state
    }
    
    var state: State
    
    func trigger(event: Event) {
        let transition = transitions[state][event]
        state = transition(state)
    }
    
    func registerTransition(from: State, to: State, event: Event) {
        if let transition = transitions[from][event] {
            transitions[from][event] = transition
        } else {
            transitions[from][event] = { $0 }
        }
    }
    
    private var transitions: [State: [Event: (State -> State)]] = [:]
}

State: Hashable, Event: Hashable> {
    init(state: State) {
        self.state = state
    }
    
    var state: State
    
    func trigger(event: Event) {
        let transition = transitions[state][event]
        state = transition(state)
    }
    
    func registerTransition(from: State, to: State, event: Event) {
        if let transition = transitions[from][event] {
            transitions[from][event] = transition
        } else {
            transitions[from][event] = { $0 }
        }
    }
    
    private var transitions: [State: [Event: (State -> State)]] = [:]
}

protocol StateMachineProtocol {
    associatedtype State: Hashable
    associatedtype Event: Hashable
    init(state: State)
    var state: State { get }
    func trigger(event: Event)
    func registerTransition(from: State, to: State, event: Event)
}

class StateMachine<State: Hashable, Event: Hashable> {
    private var state: State
    private var transitions: [State: [State: [Event: State]]] = [:]
    
    init(state: State) {
        self.state = state
    }
    
    var state: State {
        get {
            return state
        }
    }
    
    func trigger(event: Event) {
        if let transition = transitions[state][event] {
            state = transition
        }
    }
    
    func registerTransition(from: State, to: State, event: Event) {
        if !transitions.contains(from) {
            transitions[from] = [:]
        }
        
        if !transitions[from].contains(to) {
            transitions[from][to] = [:]
        }
        
        transitions[from][to][event] = to
    }
}

State: Hashable, Event: Hashable> {
    private var state: State
    private var transitions: [State: [State: [Event: State]]] = [:]
    
    init(state: State) {
        self.state = state
    }
    
    var state: State {
        get {
            return state
        }
    }
    
    func trigger(event: Event) {
        if let transition = transitions[state][event] {
            state = transition
        }
    }
    
    func registerTransition(from: State, to: State, event: Event) {
        if !transitions.contains(from) {
            transitions[from] = [:]
        }
        
        if !transitions[from].contains(to) {
            transitions[from][to] = [:]
        }
        
        transitions[from][to][event] = to
    }
}

protocol StateMachineProtocol {
    associatedtype State: Hashable
    associatedtype Event: Hashable
    init(state: State)
    var state: State { get }
    func trigger(event: Event)
    func registerTransition(from: State, to: State, event: Event)
}

class StateMachine<State: Hashable, Event: Hashable> {
    var state: State
    var transitions: [State: [Event: State]] = [:]
    init(state: State) {
        self.state = state
    }
    func trigger(event: Event) {
        if let to = transitions[state]?[event] {
            state = to
        }
    }
    func registerTransition(from: State, to: State, event: Event) {
        if let to = transitions[from] {
            to[event] = to
        } else {
            transitions[from] = [event: to]
        }
    }
}

State: Hashable, Event: Hashable> {
    var state: State
    var transitions: [State: [Event: State]] = [:]
    init(state: State) {
        self.state = state
    }
    func trigger(event: Event) {
        if let to = transitions[state]?[event] {
            state = to
        }
    }
    func registerTransition(from: State, to: State, event: Event) {
        if let to = transitions[from] {
            to[event] = to
        } else {
            transitions[from] = [event: to]
        }
    }
}

protocol StateMachineProtocol {
    associatedtype State: Hashable
    associatedtype Event: Hashable
    init(state: State)
    var state: State { get }
    func trigger(event: Event)
    func registerTransition(from: State, to: State, event: Event)
}

class StateMachine<State: Hashable, Event: Hashable> {
    private var state: State
    private var transitions: [State: [State: Event]] = [:]
    
    init(state: State) {
        self.state = state
    }
    
    var state: State {
        get {
            return state
        }
    }
    
    func trigger(event: Event) {
        if let transition = transitions[state][event] {
            state = transition
        }
    }
    
    func registerTransition(from: State, to: State, event: Event) {
        if let transition = transitions[from] {
            transition[to] = event
        } else {
            transitions[from] = [to: event]
        }
    }
}

State: Hashable, Event: Hashable> {
    private var state: State
    private var transitions: [State: [State: Event]] = [:]
    
    init(state: State) {
        self.state = state
    }
    
    var state: State {
        get {
            return state
        }
    }
    
    func trigger(event: Event) {
        if let transition = transitions[state][event] {
            state = transition
        }
    }
    
    func registerTransition(from: State, to: State, event: Event) {
        if let transition = transitions[from] {
            transition[to] = event
        } else {
            transitions[from] = [to: event]
        }
    }
}

protocol StateMachineProtocol {
    associatedtype State: Hashable
    associatedtype Event: Hashable
    init(state: State)
    var state: State { get }
    func trigger(event: Event)
    func registerTransition(from: State, to: State, event: Event)
}

class StateMachine<State: Hashable, Event: Hashable> {
    var state: State
    var transitions: [State: [State: [Event: State]]] = [:]
    init(state: State) {
        self.state = state
    }
    func trigger(event: Event) {
        if let transition = transitions[state][event] {
            self.state = transition
        }
    }
    func registerTransition(from: State, to: State, event: Event) {
        if !transitions[from].contains(where: { $0.key == event }) {
            transitions[from][event] = to
        }
    }
}

State: Hashable, Event: Hashable> {
    var state: State
    var transitions: [State: [State: [Event: State]]] = [:]
    init(state: State) {
        self.state = state
    }
    func trigger(event: Event) {
        if let transition = transitions[state][event] {
            self.state = transition
        }
    }
    func registerTransition(from: State, to: State, event: Event) {
        if !transitions[from].contains(where: { $0.key == event }) {
            transitions[from][event] = to
        }
    }
}

indirect enum FileSystemNode {
    case file(name: String, size: Int)
    case directory(name: String, contents: [FileSystemNode])
}

protocol FileSystemInfo {
    var totalSize: Int { get }
    var filesCount: Int { get }
    var treeDepth: Int { get }
}

extension FileSystemNode: FileSystemInfo {
    var totalSize: Int {
        switch self {
        case .file(let size):
            return size
        case .directory(let contents):
            return contents.reduce(0) { $0 + $1.totalSize }
        }
    }

    var filesCount: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.reduce(0) { $0 + $1.filesCount }
        }
    }

    var treeDepth: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.reduce(0) { $0 + $1.treeDepth }
        }
    }
}

    var totalSize: Int {
        switch self {
        case .file(let size):
            return size
        case .directory(let contents):
            return contents.reduce(0) { $0 + $1.totalSize }
        }
    }

    var filesCount: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.reduce(0) { $0 + $1.filesCount }
        }
    }

    var treeDepth: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.reduce(0) { $0 + $1.treeDepth }
        }
    }
}

indirect enum FileSystemNode {
    case file(name: String, size: Int)
    case directory(name: String, contents: [FileSystemNode])
}

protocol FileSystemInfo {
    var totalSize: Int { get }
    var filesCount: Int { get }
    var treeDepth: Int { get }
}

extension FileSystemNode: FileSystemInfo {
    var totalSize: Int {
        switch self {
        case .file(let size):
            return size
        case .directory(let contents):
            return contents.map { $0.totalSize }.reduce(0, +)
        }
    }
    var filesCount: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.map { $0.filesCount }.reduce(0, +)
        }
    }
    var treeDepth: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return 1 + contents.map { $0.treeDepth }.max() ?? 0
        }
    }
}

    var totalSize: Int {
        switch self {
        case .file(let size):
            return size
        case .directory(let contents):
            return contents.map { $0.totalSize }.reduce(0, +)
        }
    }
    var filesCount: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.map { $0.filesCount }.reduce(0, +)
        }
    }
    var treeDepth: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return 1 + contents.map { $0.treeDepth }.max() ?? 0
        }
    }
}

indirect enum FileSystemNode {
    case file(name: String, size: Int)
    case directory(name: String, contents: [FileSystemNode])
}

protocol FileSystemInfo {
    var totalSize: Int { get }
    var filesCount: Int { get }
    var treeDepth: Int { get }
}

extension FileSystemNode: FileSystemInfo {
    var totalSize: Int {
        switch self {
        case .file(let size):
            return size
        case .directory(let contents):
            return contents.reduce(0) { $0 + $1.totalSize }
        }
    }
    var filesCount: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.reduce(0) { $0 + $1.filesCount }
        }
    }
    var treeDepth: Int {
        switch self {
        case .file:
            return 0
        case .directory(let contents):
            return contents.reduce(0) { $0 + $1.treeDepth }
        }
    }
}

    var totalSize: Int {
        switch self {
        case .file(let size):
            return size
        case .directory(let contents):
            return contents.reduce(0) { $0 + $1.totalSize }
        }
    }
    var filesCount: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.reduce(0) { $0 + $1.filesCount }
        }
    }
    var treeDepth: Int {
        switch self {
        case .file:
            return 0
        case .directory(let contents):
            return contents.reduce(0) { $0 + $1.treeDepth }
        }
    }
}

indirect enum FileSystemNode {
    case file(name: String, size: Int)
    case directory(name: String, contents: [FileSystemNode])
}

protocol FileSystemInfo {
    var totalSize: Int { get }
    var filesCount: Int { get }
    var treeDepth: Int { get }
}

extension FileSystemNode: FileSystemInfo {
    var totalSize: Int {
        switch self {
        case .file(let size):
            return size
        case .directory(let contents):
            return contents.map { $0.totalSize }.reduce(0, +)
        }
    }
    var filesCount: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.map { $0.filesCount }.reduce(0, +)
        }
    }
    var treeDepth: Int {
        switch self {
        case .file:
            return 0
        case .directory(let contents):
            return contents.map { $0.treeDepth }.max() ?? 0 + 1
        }
    }
}

    var totalSize: Int {
        switch self {
        case .file(let size):
            return size
        case .directory(let contents):
            return contents.map { $0.totalSize }.reduce(0, +)
        }
    }
    var filesCount: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.map { $0.filesCount }.reduce(0, +)
        }
    }
    var treeDepth: Int {
        switch self {
        case .file:
            return 0
        case .directory(let contents):
            return contents.map { $0.treeDepth }.max() ?? 0 + 1
        }
    }
}

indirect enum FileSystemNode {
    case file(name: String, size: Int)
    case directory(name: String, contents: [FileSystemNode])
}

protocol FileSystemInfo {
    var totalSize: Int { get }
    var filesCount: Int { get }
    var treeDepth: Int { get }
}

extension FileSystemNode: FileSystemInfo {
    var totalSize: Int {
        switch self {
        case .file(let size):
            return size
        case .directory(let contents):
            return contents.map { $0.totalSize }.reduce(0, +)
        }
    }
    var filesCount: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.map { $0.filesCount }.reduce(0, +)
        }
    }
    var treeDepth: Int {
        switch self {
        case .file:
            return 0
        case .directory(let contents):
            return contents.map { $0.treeDepth }.max() ?? 0 + 1
        }
    }
}

    var totalSize: Int {
        switch self {
        case .file(let size):
            return size
        case .directory(let contents):
            return contents.map { $0.totalSize }.reduce(0, +)
        }
    }
    var filesCount: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.map { $0.filesCount }.reduce(0, +)
        }
    }
    var treeDepth: Int {
        switch self {
        case .file:
            return 0
        case .directory(let contents):
            return contents.map { $0.treeDepth }.max() ?? 0 + 1
        }
    }
}

indirect enum FileSystemNode {
    case file(name: String, size: Int)
    case directory(name: String, contents: [FileSystemNode])
}

protocol FileSystemInfo {
    var totalSize: Int { get }
    var filesCount: Int { get }
    var treeDepth: Int { get }
}

extension FileSystemNode: FileSystemInfo {
    var totalSize: Int {
        switch self {
        case .file(let size):
            return size
        case .directory(let contents):
            return contents.map { $0.totalSize }.reduce(0, +)
        }
    }
    var filesCount: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.map { $0.filesCount }.reduce(0, +)
        }
    }
    var treeDepth: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return 1 + contents.map { $0.treeDepth }.max() ?? 0
        }
    }
}

    var totalSize: Int {
        switch self {
        case .file(let size):
            return size
        case .directory(let contents):
            return contents.map { $0.totalSize }.reduce(0, +)
        }
    }
    var filesCount: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.map { $0.filesCount }.reduce(0, +)
        }
    }
    var treeDepth: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return 1 + contents.map { $0.treeDepth }.max() ?? 0
        }
    }
}

indirect enum FileSystemNode {
    case file(name: String, size: Int)
    case directory(name: String, contents: [FileSystemNode])
}

protocol FileSystemInfo {
    var totalSize: Int { get }
    var filesCount: Int { get }
    var treeDepth: Int { get }
}

extension FileSystemNode: FileSystemInfo {
    var totalSize: Int {
        switch self {
        case .file(let size):
            return size
        case .directory(let contents):
            return contents.map { $0.totalSize }.reduce(0, +)
        }
    }
    var filesCount: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.map { $0.filesCount }.reduce(0, +)
        }
    }
    var treeDepth: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.map { $0.treeDepth }.max() ?? 0 + 1
        }
    }
}

    var totalSize: Int {
        switch self {
        case .file(let size):
            return size
        case .directory(let contents):
            return contents.map { $0.totalSize }.reduce(0, +)
        }
    }
    var filesCount: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.map { $0.filesCount }.reduce(0, +)
        }
    }
    var treeDepth: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.map { $0.treeDepth }.max() ?? 0 + 1
        }
    }
}

indirect enum FileSystemNode {
    case file(name: String, size: Int)
    case directory(name: String, contents: [FileSystemNode])
}

protocol FileSystemInfo {
    var totalSize: Int { get }
    var filesCount: Int { get }
    var treeDepth: Int { get }
}

extension FileSystemNode: FileSystemInfo {
    var totalSize: Int {
        switch self {
        case .file(let size):
            return size
        case .directory(let contents):
            return contents.map { $0.totalSize }.reduce(0, +)
        }
    }
    var filesCount: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.map { $0.filesCount }.reduce(0, +)
        }
    }
    var treeDepth: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return 1 + contents.map { $0.treeDepth }.max() ?? 0
        }
    }
}

    var totalSize: Int {
        switch self {
        case .file(let size):
            return size
        case .directory(let contents):
            return contents.map { $0.totalSize }.reduce(0, +)
        }
    }
    var filesCount: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.map { $0.filesCount }.reduce(0, +)
        }
    }
    var treeDepth: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return 1 + contents.map { $0.treeDepth }.max() ?? 0
        }
    }
}

indirect enum FileSystemNode {
    case file(name: String, size: Int)
    case directory(name: String, contents: [FileSystemNode])
}

protocol FileSystemInfo {
    var totalSize: Int { get }
    var filesCount: Int { get }
    var treeDepth: Int { get }
}

extension FileSystemNode: FileSystemInfo {
    var totalSize: Int {
        switch self {
        case .file(let size):
            return size
        case .directory(let contents):
            return contents.reduce(0) { $0 + $1.totalSize }
        }
    }
    var filesCount: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.reduce(0) { $0 + $1.filesCount }
        }
    }
    var treeDepth: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return 1 + contents.reduce(0) { $0 > $1.treeDepth ? $0 : $1.treeDepth }
        }
    }
}

    var totalSize: Int {
        switch self {
        case .file(let size):
            return size
        case .directory(let contents):
            return contents.reduce(0) { $0 + $1.totalSize }
        }
    }
    var filesCount: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.reduce(0) { $0 + $1.filesCount }
        }
    }
    var treeDepth: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return 1 + contents.reduce(0) { $0 > $1.treeDepth ? $0 : $1.treeDepth }
        }
    }
}

indirect enum FileSystemNode {
    case file(name: String, size: Int)
    case directory(name: String, contents: [FileSystemNode])
}

protocol FileSystemInfo {
    var totalSize: Int { get }
    var filesCount: Int { get }
    var treeDepth: Int { get }
}

extension FileSystemNode: FileSystemInfo {
    var totalSize: Int {
        switch self {
        case .file(let size):
            return size
        case .directory(let contents):
            return contents.reduce(0) { $0 + $1.totalSize }
        }
    }
    var filesCount: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.reduce(0) { $0 + $1.filesCount }
        }
    }
    var treeDepth: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.reduce(0) { $0 > $1.treeDepth ? $0 : $1.treeDepth } + 1
        }
    }
}

    var totalSize: Int {
        switch self {
        case .file(let size):
            return size
        case .directory(let contents):
            return contents.reduce(0) { $0 + $1.totalSize }
        }
    }
    var filesCount: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.reduce(0) { $0 + $1.filesCount }
        }
    }
    var treeDepth: Int {
        switch self {
        case .file:
            return 1
        case .directory(let contents):
            return contents.reduce(0) { $0 > $1.treeDepth ? $0 : $1.treeDepth } + 1
        }
    }
}

protocol StackProtocol {
    associatedtype Element
    init()
    func push(_ element: Element)
    func pop() -> Element?
}

class Stack<Element> : StackProtocol {
    private var elements = [Element]()
    
    init() {
        
    }
    
    func push(_ element: Element) {
        elements.append(element)
    }
    
    func pop() -> Element? {
        return elements.removeLast()
    }
}

Element> : StackProtocol {
    private var elements = [Element]()
    
    init() {
        
    }
    
    func push(_ element: Element) {
        elements.append(element)
    }
    
    func pop() -> Element? {
        return elements.removeLast()
    }
}

protocol StackProtocol {
    associatedtype Element
    init()
    func push(_ element: Element)
    func pop() -> Element?
}

class Stack<Element> : StackProtocol {
    private var elements: [Element] = []
    
    init() {
        
    }
    
    func push(_ element: Element) {
        elements.append(element)
    }
    
    func pop() -> Element? {
        if elements.isEmpty {
            return nil
        }
        
        return elements.removeLast()
    }
}

Element> : StackProtocol {
    private var elements: [Element] = []
    
    init() {
        
    }
    
    func push(_ element: Element) {
        elements.append(element)
    }
    
    func pop() -> Element? {
        if elements.isEmpty {
            return nil
        }
        
        return elements.removeLast()
    }
}

protocol StackProtocol {
    associatedtype Element
    init()
    func push(_ element: Element)
    func pop() -> Element?
}

class Stack<Element> : StackProtocol {
    var elements = [Element]()
    
    init() {
        self.elements = [Element]()
    }
    
    func push(_ element: Element) {
        self.elements.append(element)
    }
    
    func pop() -> Element? {
        guard !self.elements.isEmpty else {
            return nil
        }
        
        return self.elements.removeLast()
    }
}

Element> : StackProtocol {
    var elements = [Element]()
    
    init() {
        self.elements = [Element]()
    }
    
    func push(_ element: Element) {
        self.elements.append(element)
    }
    
    func pop() -> Element? {
        guard !self.elements.isEmpty else {
            return nil
        }
        
        return self.elements.removeLast()
    }
}

protocol StackProtocol {
    associatedtype Element
    init()
    func push(_ element: Element)
    func pop() -> Element?
}

class Stack<Element> : StackProtocol {
    var elements: [Element] = []
    
    init() {
        
    }
    
    func push(_ element: Element) {
        elements.append(element)
    }
    
    func pop() -> Element? {
        return elements.removeLast()
    }
}

Element> : StackProtocol {
    var elements: [Element] = []
    
    init() {
        
    }
    
    func push(_ element: Element) {
        elements.append(element)
    }
    
    func pop() -> Element? {
        return elements.removeLast()
    }
}

protocol StackProtocol {
    associatedtype Element
    init()
    func push(_ element: Element)
    func pop() -> Element?
}

class Stack<Element> : StackProtocol {
    var elements: [Element] = []
    
    init() {
        
    }
    
    func push(_ element: Element) {
        elements.append(element)
    }
    
    func pop() -> Element? {
        if elements.isEmpty {
            return nil
        }
        
        return elements.removeLast()
    }
}

Element> : StackProtocol {
    var elements: [Element] = []
    
    init() {
        
    }
    
    func push(_ element: Element) {
        elements.append(element)
    }
    
    func pop() -> Element? {
        if elements.isEmpty {
            return nil
        }
        
        return elements.removeLast()
    }
}

protocol StackProtocol {
    associatedtype Element
    init()
    func push(_ element: Element)
    func pop() -> Element?
}

class Stack<Element> : StackProtocol {
    private var elements = [Element]()
    
    init() {
        self.elements = [Element]()
    }
    
    func push(_ element: Element) {
        self.elements.append(element)
    }
    
    func pop() -> Element? {
        if self.elements.isEmpty {
            return nil
        }
        
        return self.elements.removeLast()
    }
}

Element> : StackProtocol {
    private var elements = [Element]()
    
    init() {
        self.elements = [Element]()
    }
    
    func push(_ element: Element) {
        self.elements.append(element)
    }
    
    func pop() -> Element? {
        if self.elements.isEmpty {
            return nil
        }
        
        return self.elements.removeLast()
    }
}

protocol StackProtocol {
    associatedtype Element
    init()
    func push(_ element: Element)
    func pop() -> Element?
}

class Stack<Element> : StackProtocol {
    private var elements: [Element] = []
    
    init() {
        
    }
    
    func push(_ element: Element) {
        elements.append(element)
    }
    
    func pop() -> Element? {
        if elements.isEmpty {
            return nil
        }
        
        return elements.removeLast()
    }
}

Element> : StackProtocol {
    private var elements: [Element] = []
    
    init() {
        
    }
    
    func push(_ element: Element) {
        elements.append(element)
    }
    
    func pop() -> Element? {
        if elements.isEmpty {
            return nil
        }
        
        return elements.removeLast()
    }
}

protocol StackProtocol {
    associatedtype Element
    init()
    func push(_ element: Element)
    func pop() -> Element?
}

class Stack<Element> : StackProtocol {
    private var elements: [Element] = []
    
    init() {
        
    }
    
    func push(_ element: Element) {
        elements.append(element)
    }
    
    func pop() -> Element? {
        if elements.isEmpty {
            return nil
        }
        
        return elements.removeLast()
    }
}

Element> : StackProtocol {
    private var elements: [Element] = []
    
    init() {
        
    }
    
    func push(_ element: Element) {
        elements.append(element)
    }
    
    func pop() -> Element? {
        if elements.isEmpty {
            return nil
        }
        
        return elements.removeLast()
    }
}

protocol StackProtocol {
    associatedtype Element
    init()
    func push(_ element: Element)
    func pop() -> Element?
}

class Stack<Element> : StackProtocol {
    private var elements: [Element] = []
    
    init() {
        
    }
    
    func push(_ element: Element) {
        elements.append(element)
    }
    
    func pop() -> Element? {
        return elements.removeLast()
    }
}

Element> : StackProtocol {
    private var elements: [Element] = []
    
    init() {
        
    }
    
    func push(_ element: Element) {
        elements.append(element)
    }
    
    func pop() -> Element? {
        return elements.removeLast()
    }
}

protocol StackProtocol {
    associatedtype Element
    init()
    func push(_ element: Element)
    func pop() -> Element?
}

class Stack<Element> : StackProtocol {
    var elements: [Element] = []
    
    init() {
        
    }
    
    func push(_ element: Element) {
        elements.append(element)
    }
    
    func pop() -> Element? {
        return elements.removeLast()
    }
}

Element> : StackProtocol {
    var elements: [Element] = []
    
    init() {
        
    }
    
    func push(_ element: Element) {
        elements.append(element)
    }
    
    func pop() -> Element? {
        return elements.removeLast()
    }
}

protocol CacheProtocol {
    associatedtype Key: Hashable
    associatedtype Element
    init(capacity: Int)
    subscript(key: Key) -> Element? { get set }
}

class Cache<Key: Hashable, Element> {
    // your implementation here
}

: Hashable, Element> {
    // your implementation here
}

protocol CacheProtocol {
    associatedtype Key: Hashable
    associatedtype Element
    init(capacity: Int)
    subscript(key: Key) -> Element? { get set }
}

class Cache<Key: Hashable, Element>: CacheProtocol {
    private var capacity: Int
    private var cache: [Key: Element]
    private var lastUsed: [Key: Date]
    
    init(capacity: Int) {
        self.capacity = capacity
        self.cache = [:]
        self.lastUsed = [:]
    }
    
    subscript(key: Key) -> Element? {
        get {
            if let element = cache[key] {
                lastUsed[key] = Date()
                return element
            }
            return nil
        }
        set {
            if let element = newValue {
                cache[key] = element
                lastUsed[key] = Date()
            } else {
                cache.removeValue(forKey: key)
                lastUsed.removeValue(forKey: key)
            }
            if cache.count > capacity {
                let sortedLastUsed = lastUsed.sorted { $0.value.timeIntervalSinceReferenceDate > $1.value.timeIntervalSinceReferenceDate }
                let leastRecentlyUsed = sortedLastUsed.first
                cache.removeValue(forKey: leastRecentlyUsed?.key)
                lastUsed.removeValue(forKey: leastRecentlyUsed?.key)
            }
        }
    }
}

: Hashable, Element>: CacheProtocol {
    private var capacity: Int
    private var cache: [Key: Element]
    private var lastUsed: [Key: Date]
    
    init(capacity: Int) {
        self.capacity = capacity
        self.cache = [:]
        self.lastUsed = [:]
    }
    
    subscript(key: Key) -> Element? {
        get {
            if let element = cache[key] {
                lastUsed[key] = Date()
                return element
            }
            return nil
        }
        set {
            if let element = newValue {
                cache[key] = element
                lastUsed[key] = Date()
            } else {
                cache.removeValue(forKey: key)
                lastUsed.removeValue(forKey: key)
            }
            if cache.count > capacity {
                let sortedLastUsed = lastUsed.sorted { $0.value.timeIntervalSinceReferenceDate > $1.value.timeIntervalSinceReferenceDate }
                let leastRecentlyUsed = sortedLastUsed.first
                cache.removeValue(forKey: leastRecentlyUsed?.key)
                lastUsed.removeValue(forKey: leastRecentlyUsed?.key)
            }
        }
    }
}

protocol CacheProtocol {
    associatedtype Key: Hashable
    associatedtype Element
    init(capacity: Int)
    subscript(key: Key) -> Element? { get set }
}

class Cache<Key: Hashable, Element> {
    // ...
}

: Hashable, Element> {
    // ...
}

protocol CacheProtocol {
    associatedtype Key: Hashable
    associatedtype Element
    init(capacity: Int)
    subscript(key: Key) -> Element? { get set }
}

class Cache<Key: Hashable, Element> {
    private var capacity: Int
    private var cache: [Key: Element]
    private var accessOrder: [Key: Date]
    
    init(capacity: Int) {
        self.capacity = capacity
        self.cache = [:]
        self.accessOrder = [:]
    }
    
    subscript(key: Key) -> Element? {
        get {
            if let element = cache[key] {
                accessOrder[key] = Date()
                return element
            }
            return nil
        }
        
        set {
            accessOrder[key] = Date()
            cache[key] = newValue
            
            if cache.count > capacity {
                let lastAccessedKey = accessOrder.last?.key
                cache.removeValue(forKey: lastAccessedKey!)
                accessOrder.removeValue(forKey: lastAccessedKey!)
            }
        }
    }
}

: Hashable, Element> {
    private var capacity: Int
    private var cache: [Key: Element]
    private var accessOrder: [Key: Date]
    
    init(capacity: Int) {
        self.capacity = capacity
        self.cache = [:]
        self.accessOrder = [:]
    }
    
    subscript(key: Key) -> Element? {
        get {
            if let element = cache[key] {
                accessOrder[key] = Date()
                return element
            }
            return nil
        }
        
        set {
            accessOrder[key] = Date()
            cache[key] = newValue
            
            if cache.count > capacity {
                let lastAccessedKey = accessOrder.last?.key
                cache.removeValue(forKey: lastAccessedKey!)
                accessOrder.removeValue(forKey: lastAccessedKey!)
            }
        }
    }
}

protocol CacheProtocol {
    associatedtype Key: Hashable
    associatedtype Element
    init(capacity: Int)
    subscript(key: Key) -> Element? { get set }
}

class Cache<Key: Hashable, Element> {
    init(capacity: Int)
    subscript(key: Key) -> Element? { get set }
}

: Hashable, Element> {
    init(capacity: Int)
    subscript(key: Key) -> Element? { get set }
}

protocol CacheProtocol {
    associatedtype Key: Hashable
    associatedtype Element
    init(capacity: Int)
    subscript(key: Key) -> Element? { get set }
}

class Cache<Key: Hashable, Element> {
    // ...
}

: Hashable, Element> {
    // ...
}

protocol CacheProtocol {
    associatedtype Key: Hashable
    associatedtype Element
    init(capacity: Int)
    subscript(key: Key) -> Element? { get set }
}

class Cache<Key: Hashable, Element> {
    // Your implementation goes here
}

: Hashable, Element> {
    // Your implementation goes here
}

protocol CacheProtocol {
    associatedtype Key: Hashable
    associatedtype Element
    init(capacity: Int)
    subscript(key: Key) -> Element? { get set }
}

class Cache<Key: Hashable, Element> {
    private var capacity: Int
    private var storage: [Key: Element]
    private var order: [Key: Int]
    
    init(capacity: Int) {
        self.capacity = capacity
        self.storage = [:]
        self.order = [:]
    }
    
    subscript(key: Key) -> Element? {
        get {
            if let value = storage[key] {
                order[key] = order[key]! + 1
                return value
            }
            return nil
        }
        set {
            if let value = newValue {
                if order[key] == nil {
                    order[key] = 1
                } else {
                    order[key] = order[key]! + 1
                }
                storage[key] = value
                
                if storage.count > capacity {
                    let min = order.reduce(0) { (min, value) -> Int in
                        return min < value ? min : value
                    }
                    
                    for (key, value) in order {
                        if value == min {
                            storage.removeValueForKey(key)
                            order.removeValueForKey(key)
                            break
                        }
                    }
                }
            }
        }
    }
}

: Hashable, Element> {
    private var capacity: Int
    private var storage: [Key: Element]
    private var order: [Key: Int]
    
    init(capacity: Int) {
        self.capacity = capacity
        self.storage = [:]
        self.order = [:]
    }
    
    subscript(key: Key) -> Element? {
        get {
            if let value = storage[key] {
                order[key] = order[key]! + 1
                return value
            }
            return nil
        }
        set {
            if let value = newValue {
                if order[key] == nil {
                    order[key] = 1
                } else {
                    order[key] = order[key]! + 1
                }
                storage[key] = value
                
                if storage.count > capacity {
                    let min = order.reduce(0) { (min, value) -> Int in
                        return min < value ? min : value
                    }
                    
                    for (key, value) in order {
                        if value == min {
                            storage.removeValueForKey(key)
                            order.removeValueForKey(key)
                            break
                        }
                    }
                }
            }
        }
    }
}

protocol CacheProtocol {
    associatedtype Key: Hashable
    associatedtype Element
    init(capacity: Int)
    subscript(key: Key) -> Element? { get set }
}

class Cache<Key: Hashable, Element> {
    private var capacity: Int
    private var items: [Key: Element]
    private var lastAccessed: [Key: Date]
    
    init(capacity: Int) {
        self.capacity = capacity
        self.items = [:]
        self.lastAccessed = [:]
    }
    
    subscript(key: Key) -> Element? {
        get {
            if let element = items[key] {
                lastAccessed[key] = Date()
                return element
            }
            return nil
        }
        set {
            if items.count < capacity {
                items[key] = newValue
                lastAccessed[key] = Date()
            } else {
                let leastRecentlyUsedKey = lastAccessed.sorted { $0.value.timeIntervalSinceReferenceDate > $1.value.timeIntervalSinceReferenceDate }.first?.key
                items.removeValue(forKey: leastRecentlyUsedKey!)
                items[key] = newValue
                lastAccessed[key] = Date()
            }
        }
    }
}

: Hashable, Element> {
    private var capacity: Int
    private var items: [Key: Element]
    private var lastAccessed: [Key: Date]
    
    init(capacity: Int) {
        self.capacity = capacity
        self.items = [:]
        self.lastAccessed = [:]
    }
    
    subscript(key: Key) -> Element? {
        get {
            if let element = items[key] {
                lastAccessed[key] = Date()
                return element
            }
            return nil
        }
        set {
            if items.count < capacity {
                items[key] = newValue
                lastAccessed[key] = Date()
            } else {
                let leastRecentlyUsedKey = lastAccessed.sorted { $0.value.timeIntervalSinceReferenceDate > $1.value.timeIntervalSinceReferenceDate }.first?.key
                items.removeValue(forKey: leastRecentlyUsedKey!)
                items[key] = newValue
                lastAccessed[key] = Date()
            }
        }
    }
}

protocol CacheProtocol {
    associatedtype Key: Hashable
    associatedtype Element
    init(capacity: Int)
    subscript(key: Key) -> Element? { get set }
}

class Cache<Key: Hashable, Element> {
    private var capacity: Int
    private var items: [Key: Element]
    private var lastAccessed: [Key: Date]
    
    init(capacity: Int) {
        self.capacity = capacity
        self.items = [:]
        self.lastAccessed = [:]
    }
    
    subscript(key: Key) -> Element? {
        get {
            if let element = items[key] {
                lastAccessed[key] = Date()
                return element
            }
            return nil
        }
        set {
            if items.count < capacity {
                items[key] = newValue
                lastAccessed[key] = Date()
            } else {
                let leastRecentlyUsed = lastAccessed.sorted { $0.value.timeIntervalSinceReferenceDate > $1.value.timeIntervalSinceReferenceDate }.first?.key
                lastAccessed[key] = Date()
                items.removeValue(forKey: leastRecentlyUsed!)
                items[key] = newValue
            }
        }
    }
}

: Hashable, Element> {
    private var capacity: Int
    private var items: [Key: Element]
    private var lastAccessed: [Key: Date]
    
    init(capacity: Int) {
        self.capacity = capacity
        self.items = [:]
        self.lastAccessed = [:]
    }
    
    subscript(key: Key) -> Element? {
        get {
            if let element = items[key] {
                lastAccessed[key] = Date()
                return element
            }
            return nil
        }
        set {
            if items.count < capacity {
                items[key] = newValue
                lastAccessed[key] = Date()
            } else {
                let leastRecentlyUsed = lastAccessed.sorted { $0.value.timeIntervalSinceReferenceDate > $1.value.timeIntervalSinceReferenceDate }.first?.key
                lastAccessed[key] = Date()
                items.removeValue(forKey: leastRecentlyUsed!)
                items[key] = newValue
            }
        }
    }
}

protocol ExpirableCacheProtocol {
    associatedtype Key: Hashable
    associatedtype Value
    func put(value: Value, key: Key, expiration: TimeInterval)
    func get(key: Key) -> Value?
}

class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
    var cache: [Key: (Value, TimeInterval)] = [:]
    var expiration: TimeInterval = 0
    
    func put(value: Value, key: Key, expiration: TimeInterval) {
        cache[key] = (value, expiration)
    }
    
    func get(key: Key) -> Value? {
        if let (value, expiration) = cache[key] {
            if expiration > Date().timeIntervalSince1970 {
                return value
            }
            cache.removeValueForKey(key)
        }
        return nil
    }
}

Key: Hashable, Value>: ExpirableCacheProtocol {
    var cache: [Key: (Value, TimeInterval)] = [:]
    var expiration: TimeInterval = 0
    
    func put(value: Value, key: Key, expiration: TimeInterval) {
        cache[key] = (value, expiration)
    }
    
    func get(key: Key) -> Value? {
        if let (value, expiration) = cache[key] {
            if expiration > Date().timeIntervalSince1970 {
                return value
            }
            cache.removeValueForKey(key)
        }
        return nil
    }
}

protocol ExpirableCacheProtocol {
    associatedtype Key: Hashable
    associatedtype Value
    func put(value: Value, key: Key, expiration: TimeInterval)
    func get(key: Key) -> Value?
}

class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
    var cache: [Key: (Value, TimeInterval)] = [:]
    var expiration: TimeInterval = 0
    
    func put(value: Value, key: Key, expiration: TimeInterval) {
        cache[key] = (value, expiration)
    }
    
    func get(key: Key) -> Value? {
        if let (value, expiration) = cache[key] {
            if expiration > Date().timeIntervalSince1970 {
                return value
            }
            cache.removeValueForKey(key)
        }
        return nil
    }
}

Key: Hashable, Value>: ExpirableCacheProtocol {
    var cache: [Key: (Value, TimeInterval)] = [:]
    var expiration: TimeInterval = 0
    
    func put(value: Value, key: Key, expiration: TimeInterval) {
        cache[key] = (value, expiration)
    }
    
    func get(key: Key) -> Value? {
        if let (value, expiration) = cache[key] {
            if expiration > Date().timeIntervalSince1970 {
                return value
            }
            cache.removeValueForKey(key)
        }
        return nil
    }
}

protocol ExpirableCacheProtocol {
    associatedtype Key: Hashable
    associatedtype Value
    func put(value: Value, key: Key, expiration: TimeInterval)
    func get(key: Key) -> Value?
}

class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
    private var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
    private var expiration: TimeInterval = 0
    
    init(expiration: TimeInterval) {
        self.expiration = expiration
    }
    
    func put(value: Value, key: Key, expiration: TimeInterval) {
        cache[key] = (value: value, expiration: expiration + Date().timeIntervalSince1970)
    }
    
    func get(key: Key) -> Value? {
        guard let (value, expiration) = cache[key] else {
            return nil
        }
        
        if expiration < Date().timeIntervalSince1970 {
            cache.removeValue(forKey: key)
            return nil
        }
        
        return value
    }
}

Key: Hashable, Value>: ExpirableCacheProtocol {
    private var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
    private var expiration: TimeInterval = 0
    
    init(expiration: TimeInterval) {
        self.expiration = expiration
    }
    
    func put(value: Value, key: Key, expiration: TimeInterval) {
        cache[key] = (value: value, expiration: expiration + Date().timeIntervalSince1970)
    }
    
    func get(key: Key) -> Value? {
        guard let (value, expiration) = cache[key] else {
            return nil
        }
        
        if expiration < Date().timeIntervalSince1970 {
            cache.removeValue(forKey: key)
            return nil
        }
        
        return value
    }
}

protocol ExpirableCacheProtocol {
    associatedtype Key: Hashable
    associatedtype Value
    func put(value: Value, key: Key, expiration: TimeInterval)
    func get(key: Key) -> Value?
}

class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
    private var cache: [Key: (value: Value, expiration: TimeInterval)]
    private var evictionPolicy: EvictionPolicyProtocol
    
    init(evictionPolicy: EvictionPolicyProtocol) {
        self.evictionPolicy = evictionPolicy
        self.cache = [:]
    }
    
    func put(value: Value, key: Key, expiration: TimeInterval) {
        cache[key] = (value: value, expiration: expiration)
        evictionPolicy.add(key: key, value: value, expiration: expiration)
    }
    
    func get(key: Key) -> Value? {
        if let (value, expiration) = cache[key] {
            if expiration > Date().timeIntervalSince1970 {
                return value
            }
        }
        return nil
    }
    
    subscript(key: Key) -> Value? {
        return get(key: key)
    }
}

Key: Hashable, Value>: ExpirableCacheProtocol {
    private var cache: [Key: (value: Value, expiration: TimeInterval)]
    private var evictionPolicy: EvictionPolicyProtocol
    
    init(evictionPolicy: EvictionPolicyProtocol) {
        self.evictionPolicy = evictionPolicy
        self.cache = [:]
    }
    
    func put(value: Value, key: Key, expiration: TimeInterval) {
        cache[key] = (value: value, expiration: expiration)
        evictionPolicy.add(key: key, value: value, expiration: expiration)
    }
    
    func get(key: Key) -> Value? {
        if let (value, expiration) = cache[key] {
            if expiration > Date().timeIntervalSince1970 {
                return value
            }
        }
        return nil
    }
    
    subscript(key: Key) -> Value? {
        return get(key: key)
    }
}

protocol ExpirableCacheProtocol {
    associatedtype Key: Hashable
    associatedtype Value
    func put(value: Value, key: Key, expiration: TimeInterval)
    func get(key: Key) -> Value?
}

class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
    private var cache: [Key: (value: Value, expiration: TimeInterval)]
    private var evictionPolicy: EvictionPolicy
    
    init(capacity: Int, evictionPolicy: EvictionPolicy) {
        self.cache = [:]
        self.evictionPolicy = evictionPolicy
    }
    
    func put(value: Value, key: Key, expiration: TimeInterval) {
        cache[key] = (value: value, expiration: expiration)
    }
    
    func get(key: Key) -> Value? {
        if let (value, expiration) = cache[key] {
            if expiration > Date().timeIntervalSince1970 {
                return value
            } else {
                evict(key)
            }
        }
        return nil
    }
    
    func evict(key: Key) {
        evictionPolicy.evict(key: key, cache: &cache)
    }
}

Key: Hashable, Value>: ExpirableCacheProtocol {
    private var cache: [Key: (value: Value, expiration: TimeInterval)]
    private var evictionPolicy: EvictionPolicy
    
    init(capacity: Int, evictionPolicy: EvictionPolicy) {
        self.cache = [:]
        self.evictionPolicy = evictionPolicy
    }
    
    func put(value: Value, key: Key, expiration: TimeInterval) {
        cache[key] = (value: value, expiration: expiration)
    }
    
    func get(key: Key) -> Value? {
        if let (value, expiration) = cache[key] {
            if expiration > Date().timeIntervalSince1970 {
                return value
            } else {
                evict(key)
            }
        }
        return nil
    }
    
    func evict(key: Key) {
        evictionPolicy.evict(key: key, cache: &cache)
    }
}

protocol ExpirableCacheProtocol {
    associatedtype Key: Hashable
    associatedtype Value
    func put(value: Value, key: Key, expiration: TimeInterval)
    func get(key: Key) -> Value?
}

class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
    var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
    
    func put(value: Value, key: Key, expiration: TimeInterval) {
        cache[key] = (value: value, expiration: expiration)
    }
    
    func get(key: Key) -> Value? {
        if let (_, (value, _)) = cache[key] {
            return value
        }
        return nil
    }
}

Key: Hashable, Value>: ExpirableCacheProtocol {
    var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
    
    func put(value: Value, key: Key, expiration: TimeInterval) {
        cache[key] = (value: value, expiration: expiration)
    }
    
    func get(key: Key) -> Value? {
        if let (_, (value, _)) = cache[key] {
            return value
        }
        return nil
    }
}

protocol ExpirableCacheProtocol {
    associatedtype Key: Hashable
    associatedtype Value
    func put(value: Value, key: Key, expiration: TimeInterval)
    func get(key: Key) -> Value?
}

class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
    var cache: [Key: (value: Value?, expiration: TimeInterval)]
    var maxSize: Int
    var size: Int
    var evictionPolicy: EvictionPolicyProtocol
    
    init(maxSize: Int, evictionPolicy: EvictionPolicyProtocol) {
        self.maxSize = maxSize
        self.evictionPolicy = evictionPolicy
        self.cache = [:]
        self.size = 0
    }
    
    func put(value: Value, key: Key, expiration: TimeInterval) {
        cache[key] = (value: value, expiration: expiration)
        size += 1
        if size > maxSize {
            let evictedKey = evictionPolicy.evict()
            cache.removeValueForKey(evictedKey)
            size -= 1
        }
    }
    
    func get(key: Key) -> Value? {
        if let (_, expiration) = cache[key] {
            if expiration < Date().timeIntervalSince1970 {
                cache.removeValueForKey(key)
                return nil
            }
            return cache[key]?.value
        }
        return nil
    }
    
    subscript(key: Key) -> Value? {
        return get(key: key)
    }
}

Key: Hashable, Value>: ExpirableCacheProtocol {
    var cache: [Key: (value: Value?, expiration: TimeInterval)]
    var maxSize: Int
    var size: Int
    var evictionPolicy: EvictionPolicyProtocol
    
    init(maxSize: Int, evictionPolicy: EvictionPolicyProtocol) {
        self.maxSize = maxSize
        self.evictionPolicy = evictionPolicy
        self.cache = [:]
        self.size = 0
    }
    
    func put(value: Value, key: Key, expiration: TimeInterval) {
        cache[key] = (value: value, expiration: expiration)
        size += 1
        if size > maxSize {
            let evictedKey = evictionPolicy.evict()
            cache.removeValueForKey(evictedKey)
            size -= 1
        }
    }
    
    func get(key: Key) -> Value? {
        if let (_, expiration) = cache[key] {
            if expiration < Date().timeIntervalSince1970 {
                cache.removeValueForKey(key)
                return nil
            }
            return cache[key]?.value
        }
        return nil
    }
    
    subscript(key: Key) -> Value? {
        return get(key: key)
    }
}

protocol ExpirableCacheProtocol {
    associatedtype Key: Hashable
    associatedtype Value
    func put(value: Value, key: Key, expiration: TimeInterval)
    func get(key: Key) -> Value?
}

class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
    private var cache: [Key: (value: Value, expiration: TimeInterval)]
    private var expiration: TimeInterval
    
    init(expiration: TimeInterval) {
        self.expiration = expiration
        self.cache = [:]
    }
    
    func put(value: Value, key: Key, expiration: TimeInterval) {
        self.cache[key] = (value: value, expiration: expiration + Date().timeIntervalSince1970)
    }
    
    func get(key: Key) -> Value? {
        if let (_, expiration) = self.cache[key] {
            if expiration < Date().timeIntervalSince1970 {
                self.cache.removeValue(forKey: key)
                return nil
            }
            return self.cache[key]?.value
        }
        return nil
    }
}

Key: Hashable, Value>: ExpirableCacheProtocol {
    private var cache: [Key: (value: Value, expiration: TimeInterval)]
    private var expiration: TimeInterval
    
    init(expiration: TimeInterval) {
        self.expiration = expiration
        self.cache = [:]
    }
    
    func put(value: Value, key: Key, expiration: TimeInterval) {
        self.cache[key] = (value: value, expiration: expiration + Date().timeIntervalSince1970)
    }
    
    func get(key: Key) -> Value? {
        if let (_, expiration) = self.cache[key] {
            if expiration < Date().timeIntervalSince1970 {
                self.cache.removeValue(forKey: key)
                return nil
            }
            return self.cache[key]?.value
        }
        return nil
    }
}

protocol ExpirableCacheProtocol {
    associatedtype Key: Hashable
    associatedtype Value
    func put(value: Value, key: Key, expiration: TimeInterval)
    func get(key: Key) -> Value?
}

class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
    private let cache: [Key: (Value, TimeInterval)]
    private let expiration: TimeInterval
    
    init(expiration: TimeInterval) {
        self.expiration = expiration
        self.cache = [:]
    }
    
    func put(value: Value, key: Key, expiration: TimeInterval) {
        cache[key] = (value, expiration)
    }
    
    func get(key: Key) -> Value? {
        guard let (value, expiration) = cache[key] else {
            return nil
        }
        
        if expiration < Date().timeIntervalSince1970 {
            cache.removeValue(forKey: key)
            return nil
        }
        
        return value
    }
}

Key: Hashable, Value>: ExpirableCacheProtocol {
    private let cache: [Key: (Value, TimeInterval)]
    private let expiration: TimeInterval
    
    init(expiration: TimeInterval) {
        self.expiration = expiration
        self.cache = [:]
    }
    
    func put(value: Value, key: Key, expiration: TimeInterval) {
        cache[key] = (value, expiration)
    }
    
    func get(key: Key) -> Value? {
        guard let (value, expiration) = cache[key] else {
            return nil
        }
        
        if expiration < Date().timeIntervalSince1970 {
            cache.removeValue(forKey: key)
            return nil
        }
        
        return value
    }
}

protocol ExpirableCacheProtocol {
    associatedtype Key: Hashable
    associatedtype Value
    func put(value: Value, key: Key, expiration: TimeInterval)
    func get(key: Key) -> Value?
}

class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
    private var cache: [Key: (value: Value, expiration: TimeInterval)]
    private var evictionQueue: [Key]
    private var evictionTimer: Timer?
    private var evictionInterval: TimeInterval
    private var evictionCount: Int

    init(evictionInterval: TimeInterval = 60) {
        self.evictionInterval = evictionInterval
        self.evictionCount = 0
        self.cache = [:]
        self.evictionQueue = []
        self.evictionTimer = nil
    }

    func put(value: Value, key: Key, expiration: TimeInterval) {
        let expirationDate = Date(timeIntervalSinceNow: expiration)
        let entry = (value: value, expiration: expirationDate)
        cache[key] = entry
        evictionQueue.append(key)
        evictionCount += 1
        if evictionTimer == nil {
            evictionTimer = Timer(timeInterval: evictionInterval, target: self, selector: #selector(evict), userInfo: nil, repeats: true)
            evictionTimer.resume()
        }
    }

    func get(key: Key) -> Value? {
        guard let entry = cache[key] else { return nil }
        if entry.expiration < Date() {
            evict()
            return nil
        }
        return entry.value
    }

    @objc func evict() {
        if evictionCount == 0 {
            evictionTimer?.invalidate()
            evictionTimer = nil
            return
        }
        let key = evictionQueue.removeFirst()
        cache.removeValue(forKey: key)
        evictionCount -= 1
    }
}

Key: Hashable, Value>: ExpirableCacheProtocol {
    private var cache: [Key: (value: Value, expiration: TimeInterval)]
    private var evictionQueue: [Key]
    private var evictionTimer: Timer?
    private var evictionInterval: TimeInterval
    private var evictionCount: Int

    init(evictionInterval: TimeInterval = 60) {
        self.evictionInterval = evictionInterval
        self.evictionCount = 0
        self.cache = [:]
        self.evictionQueue = []
        self.evictionTimer = nil
    }

    func put(value: Value, key: Key, expiration: TimeInterval) {
        let expirationDate = Date(timeIntervalSinceNow: expiration)
        let entry = (value: value, expiration: expirationDate)
        cache[key] = entry
        evictionQueue.append(key)
        evictionCount += 1
        if evictionTimer == nil {
            evictionTimer = Timer(timeInterval: evictionInterval, target: self, selector: #selector(evict), userInfo: nil, repeats: true)
            evictionTimer.resume()
        }
    }

    func get(key: Key) -> Value? {
        guard let entry = cache[key] else { return nil }
        if entry.expiration < Date() {
            evict()
            return nil
        }
        return entry.value
    }

    @objc func evict() {
        if evictionCount == 0 {
            evictionTimer?.invalidate()
            evictionTimer = nil
            return
        }
        let key = evictionQueue.removeFirst()
        cache.removeValue(forKey: key)
        evictionCount -= 1
    }
}

protocol EncryptorProtocol {
    func encrypt(_ string: String, _ key: String) -> Data
    func decrypt(_ data: Data, _ key: String) -> String
}

class Encryptor: EncryptorProtocol {
    func encrypt(_ string: String, _ key: String) -> Data {
        let data = string.data(using: .utf8)!
        let keyData = key.data(using: .utf8)!
        let key = keyData.withUnsafeBytes { keyBytes in
            keyBytes.map { UInt8($0) }
        }
        let encryptedData = data.withUnsafeBytes { dataBytes in
            key.map { keyByte in
                dataBytes.map { dataByte in
                    return dataByte ^ keyByte
                }
            }
        }
        return encryptedData
    }

    func decrypt(_ data: Data, _ key: String) -> String {
        let keyData = key.data(using: .utf8)!
        let key = keyData.withUnsafeBytes { keyBytes in
            keyBytes.map { UInt8($0) }
        }
        let decryptedData = data.withUnsafeBytes { dataBytes in
            key.map { keyByte in
                dataBytes.map { dataByte in
                    return dataByte ^ keyByte
                }
            }
        }
        return String(data: decryptedData, encoding: .utf8)!
    }
}

    func encrypt(_ string: String, _ key: String) -> Data {
        let data = string.data(using: .utf8)!
        let keyData = key.data(using: .utf8)!
        let key = keyData.withUnsafeBytes { keyBytes in
            keyBytes.map { UInt8($0) }
        }
        let encryptedData = data.withUnsafeBytes { dataBytes in
            key.map { keyByte in
                dataBytes.map { dataByte in
                    return dataByte ^ keyByte
                }
            }
        }
        return encryptedData
    }

    func decrypt(_ data: Data, _ key: String) -> String {
        let keyData = key.data(using: .utf8)!
        let key = keyData.withUnsafeBytes { keyBytes in
            keyBytes.map { UInt8($0) }
        }
        let decryptedData = data.withUnsafeBytes { dataBytes in
            key.map { keyByte in
                dataBytes.map { dataByte in
                    return dataByte ^ keyByte
                }
            }
        }
        return String(data: decryptedData, encoding: .utf8)!
    }
}

protocol EncryptorProtocol {
    func encrypt(_ string: String, _ key: String) -> Data
    func decrypt(_ data: Data, _ key: String) -> String
}

class Encryptor: EncryptorProtocol {
    func encrypt(_ string: String, _ key: String) -> Data {
        let data = string.data(using: .utf8)!
        let keyData = key.data(using: .utf8)!
        var encryptedData = Data()
        for i in 0..<data.count {
            encryptedData.append(UInt8(data[i]) ^ UInt8(keyData[i % keyData.count]))
        }
        return encryptedData
    }
    
    func decrypt(_ data: Data, _ key: String) -> String {
        let keyData = key.data(using: .utf8)!
        var decryptedData = Data()
        for i in 0..<data.count {
            decryptedData.append(UInt8(data[i]) ^ UInt8(keyData[i % keyData.count]))
        }
        return String(data: decryptedData, encoding: .utf8)!
    }
}

    func encrypt(_ string: String, _ key: String) -> Data {
        let data = string.data(using: .utf8)!
        let keyData = key.data(using: .utf8)!
        var encryptedData = Data()
        for i in 0..<data.count {
            encryptedData.append(UInt8(data[i]) ^ UInt8(keyData[i % keyData.count]))
        }
        return encryptedData
    }
    
    func decrypt(_ data: Data, _ key: String) -> String {
        let keyData = key.data(using: .utf8)!
        var decryptedData = Data()
        for i in 0..<data.count {
            decryptedData.append(UInt8(data[i]) ^ UInt8(keyData[i % keyData.count]))
        }
        return String(data: decryptedData, encoding: .utf8)!
    }
}

protocol EncryptorProtocol {
    func encrypt(_ string: String, _ key: String) -> Data
    func decrypt(_ data: Data, _ key: String) -> String
}

class Encryptor: EncryptorProtocol {
    func encrypt(_ string: String, _ key: String) -> Data {
        let keyData = key.data(using: .utf8)!
        let stringData = string.data(using: .utf8)!
        let keyLength = keyData.count
        var encryptedData = Data()
        for i in 0..<stringData.count {
            let keyByte = keyData[i % keyLength]
            let stringByte = stringData[i]
            let xorByte = stringByte ^ keyByte
            encryptedData.append(xorByte)
        }
        return encryptedData
    }
    func decrypt(_ data: Data, _ key: String) -> String {
        let keyData = key.data(using: .utf8)!
        let dataLength = data.count
        var decryptedData = String()
        for i in 0..<dataLength {
            let keyByte = keyData[i % keyData.count]
            let dataByte = data[i]
            let xorByte = dataByte ^ keyByte
            decryptedData.append(String(Character(UnicodeScalar(xorByte)!)))
        }
        return decryptedData
    }
}

    func encrypt(_ string: String, _ key: String) -> Data {
        let keyData = key.data(using: .utf8)!
        let stringData = string.data(using: .utf8)!
        let keyLength = keyData.count
        var encryptedData = Data()
        for i in 0..<stringData.count {
            let keyByte = keyData[i % keyLength]
            let stringByte = stringData[i]
            let xorByte = stringByte ^ keyByte
            encryptedData.append(xorByte)
        }
        return encryptedData
    }
    func decrypt(_ data: Data, _ key: String) -> String {
        let keyData = key.data(using: .utf8)!
        let dataLength = data.count
        var decryptedData = String()
        for i in 0..<dataLength {
            let keyByte = keyData[i % keyData.count]
            let dataByte = data[i]
            let xorByte = dataByte ^ keyByte
            decryptedData.append(String(Character(UnicodeScalar(xorByte)!)))
        }
        return decryptedData
    }
}

protocol EncryptorProtocol {
    func encrypt(_ string: String, _ key: String) -> Data
    func decrypt(_ data: Data, _ key: String) -> String
}

class Encryptor: EncryptorProtocol {
    func encrypt(_ string: String, _ key: String) -> Data {
        let keyData = key.data(using: .utf8)!
        let stringData = string.data(using: .utf8)!
        let keySize = keyData.count
        let stringSize = stringData.count
        var keyIndex = 0
        var stringIndex = 0
        var result = Data()
        while stringIndex < stringSize {
            let keyByte = keyData[keyIndex]
            let stringByte = stringData[stringIndex]
            let xorByte = stringByte ^ keyByte
            result.append(UInt8(xorByte))
            keyIndex = (keyIndex + 1) % keySize
            stringIndex += 1
        }
        return result
    }
    
    func decrypt(_ data: Data, _ key: String) -> String {
        let keyData = key.data(using: .utf8)!
        let dataSize = data.count
        var keyIndex = 0
        var dataIndex = 0
        var result = ""
        while dataIndex < dataSize {
            let keyByte = keyData[keyIndex]
            let dataByte = data[dataIndex]
            let xorByte = dataByte ^ keyByte
            result.append(String(Character(UnicodeScalar(UInt8(xorByte))!)))
            keyIndex = (keyIndex + 1) % keyData.count
            dataIndex += 1
        }
        return result
    }
}

    func encrypt(_ string: String, _ key: String) -> Data {
        let keyData = key.data(using: .utf8)!
        let stringData = string.data(using: .utf8)!
        let keySize = keyData.count
        let stringSize = stringData.count
        var keyIndex = 0
        var stringIndex = 0
        var result = Data()
        while stringIndex < stringSize {
            let keyByte = keyData[keyIndex]
            let stringByte = stringData[stringIndex]
            let xorByte = stringByte ^ keyByte
            result.append(UInt8(xorByte))
            keyIndex = (keyIndex + 1) % keySize
            stringIndex += 1
        }
        return result
    }
    
    func decrypt(_ data: Data, _ key: String) -> String {
        let keyData = key.data(using: .utf8)!
        let dataSize = data.count
        var keyIndex = 0
        var dataIndex = 0
        var result = ""
        while dataIndex < dataSize {
            let keyByte = keyData[keyIndex]
            let dataByte = data[dataIndex]
            let xorByte = dataByte ^ keyByte
            result.append(String(Character(UnicodeScalar(UInt8(xorByte))!)))
            keyIndex = (keyIndex + 1) % keyData.count
            dataIndex += 1
        }
        return result
    }
}

protocol EncryptorProtocol {
    func encrypt(_ string: String, _ key: String) -> Data
    func decrypt(_ data: Data, _ key: String) -> String
}

class Encryptor: EncryptorProtocol {
    func encrypt(_ string: String, _ key: String) -> Data {
        let keyData = key.data(using: .utf8)!
        let stringData = string.data(using: .utf8)!
        let keySize = keyData.count
        let stringSize = stringData.count
        var result = Data(count: stringSize)
        for i in 0..<stringSize {
            result[i] = stringData[i] ^ keyData[i % keySize]
        }
        return result
    }
    
    func decrypt(_ data: Data, _ key: String) -> String {
        let keyData = key.data(using: .utf8)!
        let dataSize = data.count
        var result = String()
        for i in 0..<dataSize {
            result += String(characters: [data[i] ^ keyData[i % keyData.count]])
        }
        return result
    }
}

    func encrypt(_ string: String, _ key: String) -> Data {
        let keyData = key.data(using: .utf8)!
        let stringData = string.data(using: .utf8)!
        let keySize = keyData.count
        let stringSize = stringData.count
        var result = Data(count: stringSize)
        for i in 0..<stringSize {
            result[i] = stringData[i] ^ keyData[i % keySize]
        }
        return result
    }
    
    func decrypt(_ data: Data, _ key: String) -> String {
        let keyData = key.data(using: .utf8)!
        let dataSize = data.count
        var result = String()
        for i in 0..<dataSize {
            result += String(characters: [data[i] ^ keyData[i % keyData.count]])
        }
        return result
    }
}

protocol EncryptorProtocol {
    func encrypt(_ string: String, _ key: String) -> Data
    func decrypt(_ data: Data, _ key: String) -> String
}

class Encryptor: EncryptorProtocol {
    func encrypt(_ string: String, _ key: String) -> Data {
        let keyData = key.data(using: .utf8)!
        let data = string.data(using: .utf8)!
        let keySize = keyData.count
        let dataSize = data.count
        var encryptedData = Data(count: dataSize)
        for i in 0..<dataSize {
            let keyByte = keyData[i % keySize]
            let dataByte = data[i]
            let xorByte = dataByte ^ keyByte
            encryptedData.append(xorByte)
        }
        return encryptedData
    }
    
    func decrypt(_ data: Data, _ key: String) -> String {
        let keyData = key.data(using: .utf8)!
        let dataSize = data.count
        var decryptedData = String()
        for i in 0..<dataSize {
            let keyByte = keyData[i % keyData.count]
            let dataByte = data[i]
            let xorByte = dataByte ^ keyByte
            decryptedData.append(String(format: "%c", xorByte))
        }
        return decryptedData
    }
}

    func encrypt(_ string: String, _ key: String) -> Data {
        let keyData = key.data(using: .utf8)!
        let data = string.data(using: .utf8)!
        let keySize = keyData.count
        let dataSize = data.count
        var encryptedData = Data(count: dataSize)
        for i in 0..<dataSize {
            let keyByte = keyData[i % keySize]
            let dataByte = data[i]
            let xorByte = dataByte ^ keyByte
            encryptedData.append(xorByte)
        }
        return encryptedData
    }
    
    func decrypt(_ data: Data, _ key: String) -> String {
        let keyData = key.data(using: .utf8)!
        let dataSize = data.count
        var decryptedData = String()
        for i in 0..<dataSize {
            let keyByte = keyData[i % keyData.count]
            let dataByte = data[i]
            let xorByte = dataByte ^ keyByte
            decryptedData.append(String(format: "%c", xorByte))
        }
        return decryptedData
    }
}

protocol EncryptorProtocol {
    func encrypt(_ string: String, _ key: String) -> Data
    func decrypt(_ data: Data, _ key: String) -> String
}

class Encryptor: EncryptorProtocol {
    func encrypt(_ string: String, _ key: String) -> Data {
        let keyData = key.data(using: .utf8)!
        let key = keyData.withUnsafeBytes { keyBytes in
            let key = UnsafeRawBufferPointer(start: keyBytes).bindMemory(to: UInt8.self)
            return key
        }
        let data = string.data(using: .utf8)!
        let data = data.withUnsafeBytes { dataBytes in
            let data = UnsafeRawBufferPointer(start: dataBytes).bindMemory(to: UInt8.self)
            return data
        }
        var encryptedData = Data(count: data.count)
        for i in 0..<data.count {
            encryptedData[i] = UInt8(data[i] xor key[i % key.count])
        }
        return encryptedData
    }
    
    func decrypt(_ data: Data, _ key: String) -> String {
        let keyData = key.data(using: .utf8)!
        let key = keyData.withUnsafeBytes { keyBytes in
            let key = UnsafeRawBufferPointer(start: keyBytes).bindMemory(to: UInt8.self)
            return key
        }
        let data = data.withUnsafeBytes { dataBytes in
            let data = UnsafeRawBufferPointer(start: dataBytes).bindMemory(to: UInt8.self)
            return data
        }
        var decryptedData = Data(count: data.count)
        for i in 0..<data.count {
            decryptedData[i] = UInt8(data[i] xor key[i % key.count])
        }
        return String(data: decryptedData, encoding: .utf8)!
    }
}

    func encrypt(_ string: String, _ key: String) -> Data {
        let keyData = key.data(using: .utf8)!
        let key = keyData.withUnsafeBytes { keyBytes in
            let key = UnsafeRawBufferPointer(start: keyBytes).bindMemory(to: UInt8.self)
            return key
        }
        let data = string.data(using: .utf8)!
        let data = data.withUnsafeBytes { dataBytes in
            let data = UnsafeRawBufferPointer(start: dataBytes).bindMemory(to: UInt8.self)
            return data
        }
        var encryptedData = Data(count: data.count)
        for i in 0..<data.count {
            encryptedData[i] = UInt8(data[i] xor key[i % key.count])
        }
        return encryptedData
    }
    
    func decrypt(_ data: Data, _ key: String) -> String {
        let keyData = key.data(using: .utf8)!
        let key = keyData.withUnsafeBytes { keyBytes in
            let key = UnsafeRawBufferPointer(start: keyBytes).bindMemory(to: UInt8.self)
            return key
        }
        let data = data.withUnsafeBytes { dataBytes in
            let data = UnsafeRawBufferPointer(start: dataBytes).bindMemory(to: UInt8.self)
            return data
        }
        var decryptedData = Data(count: data.count)
        for i in 0..<data.count {
            decryptedData[i] = UInt8(data[i] xor key[i % key.count])
        }
        return String(data: decryptedData, encoding: .utf8)!
    }
}

protocol EncryptorProtocol {
    func encrypt(_ string: String, _ key: String) -> Data
    func decrypt(_ data: Data, _ key: String) -> String
}

class Encryptor: EncryptorProtocol {
    func encrypt(_ string: String, _ key: String) -> Data {
        let data = string.data(using: .utf8)
        let keyData = key.data(using: .utf8)
        let keyLength = keyData.count
        var encryptedData = Data()
        for i in 0..<data.count {
            let byte = data[i]
            let keyByte = keyData[i % keyLength]
            let encryptedByte = byte ^ keyByte
            encryptedData.append(encryptedByte)
        }
        return encryptedData
    }
    
    func decrypt(_ data: Data, _ key: String) -> String {
        let keyData = key.data(using: .utf8)
        let keyLength = keyData.count
        var decryptedData = Data()
        for i in 0..<data.count {
            let byte = data[i]
            let keyByte = keyData[i % keyLength]
            let decryptedByte = byte ^ keyByte
            decryptedData.append(decryptedByte)
        }
        return String(data: decryptedData, encoding: .utf8)!
    }
}

    func encrypt(_ string: String, _ key: String) -> Data {
        let data = string.data(using: .utf8)
        let keyData = key.data(using: .utf8)
        let keyLength = keyData.count
        var encryptedData = Data()
        for i in 0..<data.count {
            let byte = data[i]
            let keyByte = keyData[i % keyLength]
            let encryptedByte = byte ^ keyByte
            encryptedData.append(encryptedByte)
        }
        return encryptedData
    }
    
    func decrypt(_ data: Data, _ key: String) -> String {
        let keyData = key.data(using: .utf8)
        let keyLength = keyData.count
        var decryptedData = Data()
        for i in 0..<data.count {
            let byte = data[i]
            let keyByte = keyData[i % keyLength]
            let decryptedByte = byte ^ keyByte
            decryptedData.append(decryptedByte)
        }
        return String(data: decryptedData, encoding: .utf8)!
    }
}

protocol EncryptorProtocol {
    func encrypt(_ string: String, _ key: String) -> Data
    func decrypt(_ data: Data, _ key: String) -> String
}

class Encryptor: EncryptorProtocol {
    func encrypt(_ string: String, _ key: String) -> Data {
        var data = Data()
        for character in string.utf8 {
            data.append(UInt8(character) ^ UInt8(key.utf8.first!))
        }
        return data
    }

    func decrypt(_ data: Data, _ key: String) -> String {
        var string = ""
        for byte in data {
            string.append(String(Characters.init(utf8CodeUnit: UInt8(byte) ^ UInt8(key.utf8.first!))))
        }
        return string
    }
}

    func encrypt(_ string: String, _ key: String) -> Data {
        var data = Data()
        for character in string.utf8 {
            data.append(UInt8(character) ^ UInt8(key.utf8.first!))
        }
        return data
    }

    func decrypt(_ data: Data, _ key: String) -> String {
        var string = ""
        for byte in data {
            string.append(String(Characters.init(utf8CodeUnit: UInt8(byte) ^ UInt8(key.utf8.first!))))
        }
        return string
    }
}

protocol EncryptorProtocol {
    func encrypt(_ string: String, _ key: String) -> Data
    func decrypt(_ data: Data, _ key: String) -> String
}

class Encryptor: EncryptorProtocol {
    func encrypt(_ string: String, _ key: String) -> Data {
        let keyData = key.data(using: .utf8)!
        let data = string.data(using: .utf8)!
        let keySize = keyData.count
        let dataSize = data.count
        var encryptedData = Data(count: dataSize)
        for i in 0..<dataSize {
            let byte = data[i]
            let keyByte = keyData[i % keySize]
            let xor = byte ^ keyByte
            encryptedData.append(xor)
        }
        return encryptedData
    }
    
    func decrypt(_ data: Data, _ key: String) -> String {
        let keyData = key.data(using: .utf8)!
        let dataSize = data.count
        var decryptedData = Data(count: dataSize)
        for i in 0..<dataSize {
            let byte = data[i]
            let keyByte = keyData[i % keyData.count]
            let xor = byte ^ keyByte
            decryptedData.append(xor)
        }
        return String(data: decryptedData, encoding: .utf8)!
    }
}

    func encrypt(_ string: String, _ key: String) -> Data {
        let keyData = key.data(using: .utf8)!
        let data = string.data(using: .utf8)!
        let keySize = keyData.count
        let dataSize = data.count
        var encryptedData = Data(count: dataSize)
        for i in 0..<dataSize {
            let byte = data[i]
            let keyByte = keyData[i % keySize]
            let xor = byte ^ keyByte
            encryptedData.append(xor)
        }
        return encryptedData
    }
    
    func decrypt(_ data: Data, _ key: String) -> String {
        let keyData = key.data(using: .utf8)!
        let dataSize = data.count
        var decryptedData = Data(count: dataSize)
        for i in 0..<dataSize {
            let byte = data[i]
            let keyByte = keyData[i % keyData.count]
            let xor = byte ^ keyByte
            decryptedData.append(xor)
        }
        return String(data: decryptedData, encoding: .utf8)!
    }
}

protocol RateLimiterProtocol {
    init(maxRequests: Int, timeInterval: TimeInterval)
    func allowRequest() -> Bool
}

class RateLimiter: RateLimiterProtocol {
    private var maxRequests: Int
    private var timeInterval: TimeInterval
    private var lastRequestTime: Date?
    
    init(maxRequests: Int, timeInterval: TimeInterval) {
        self.maxRequests = maxRequests
        self.timeInterval = timeInterval
    }
    
    func allowRequest() -> Bool {
        let currentTime = Date()
        if let lastRequestTime = lastRequestTime {
            return currentTime.timeIntervalSince(lastRequestTime) >= timeInterval
        }
        lastRequestTime = currentTime
        return true
    }
}

 RateLimiterProtocol {
    private var maxRequests: Int
    private var timeInterval: TimeInterval
    private var lastRequestTime: Date?
    
    init(maxRequests: Int, timeInterval: TimeInterval) {
        self.maxRequests = maxRequests
        self.timeInterval = timeInterval
    }
    
    func allowRequest() -> Bool {
        let currentTime = Date()
        if let lastRequestTime = lastRequestTime {
            return currentTime.timeIntervalSince(lastRequestTime) >= timeInterval
        }
        lastRequestTime = currentTime
        return true
    }
}

protocol RateLimiterProtocol {
    init(maxRequests: Int, timeInterval: TimeInterval)
    func allowRequest() -> Bool
}

class RateLimiter: RateLimiterProtocol {
    private let maxRequests: Int
    private let timeInterval: TimeInterval
    private var lastRequestTime: TimeInterval = 0
    
    init(maxRequests: Int, timeInterval: TimeInterval) {
        self.maxRequests = maxRequests
        self.timeInterval = timeInterval
    }
    
    func allowRequest() -> Bool {
        let currentTime = Date().timeIntervalSince1970
        if (currentTime - lastRequestTime) > timeInterval {
            lastRequestTime = currentTime
            return true
        }
        return false
    }
}

 RateLimiterProtocol {
    private let maxRequests: Int
    private let timeInterval: TimeInterval
    private var lastRequestTime: TimeInterval = 0
    
    init(maxRequests: Int, timeInterval: TimeInterval) {
        self.maxRequests = maxRequests
        self.timeInterval = timeInterval
    }
    
    func allowRequest() -> Bool {
        let currentTime = Date().timeIntervalSince1970
        if (currentTime - lastRequestTime) > timeInterval {
            lastRequestTime = currentTime
            return true
        }
        return false
    }
}

protocol RateLimiterProtocol {
    init(maxRequests: Int, timeInterval: TimeInterval)
    func allowRequest() -> Bool
}

class RateLimiter: RateLimiterProtocol {
    private var maxRequests: Int
    private var timeInterval: TimeInterval
    private var lastRequestTime: Date?

    init(maxRequests: Int, timeInterval: TimeInterval) {
        self.maxRequests = maxRequests
        self.timeInterval = timeInterval
    }

    func allowRequest() -> Bool {
        if let lastRequestTime = lastRequestTime {
            return Date().timeIntervalSince(lastRequestTime) >= timeInterval
        }
        lastRequestTime = Date()
        return true
    }
}

 RateLimiterProtocol {
    private var maxRequests: Int
    private var timeInterval: TimeInterval
    private var lastRequestTime: Date?

    init(maxRequests: Int, timeInterval: TimeInterval) {
        self.maxRequests = maxRequests
        self.timeInterval = timeInterval
    }

    func allowRequest() -> Bool {
        if let lastRequestTime = lastRequestTime {
            return Date().timeIntervalSince(lastRequestTime) >= timeInterval
        }
        lastRequestTime = Date()
        return true
    }
}

protocol RateLimiterProtocol {
    init(maxRequests: Int, timeInterval: TimeInterval)
    func allowRequest() -> Bool
}

class RateLimiter: RateLimiterProtocol {
    private let maxRequests: Int
    private let timeInterval: TimeInterval
    private var lastRequestTime: TimeInterval = 0

    init(maxRequests: Int, timeInterval: TimeInterval) {
        self.maxRequests = maxRequests
        self.timeInterval = timeInterval
    }

    func allowRequest() -> Bool {
        let currentTime = Date().timeIntervalSinceReferenceDate
        let elapsedTime = currentTime - lastRequestTime
        let requestsCount = maxRequests - Int(elapsedTime / timeInterval)
        let canMakeRequest = requestsCount > 0
        if canMakeRequest {
            lastRequestTime = currentTime
        }
        return canMakeRequest
    }
}

 RateLimiterProtocol {
    private let maxRequests: Int
    private let timeInterval: TimeInterval
    private var lastRequestTime: TimeInterval = 0

    init(maxRequests: Int, timeInterval: TimeInterval) {
        self.maxRequests = maxRequests
        self.timeInterval = timeInterval
    }

    func allowRequest() -> Bool {
        let currentTime = Date().timeIntervalSinceReferenceDate
        let elapsedTime = currentTime - lastRequestTime
        let requestsCount = maxRequests - Int(elapsedTime / timeInterval)
        let canMakeRequest = requestsCount > 0
        if canMakeRequest {
            lastRequestTime = currentTime
        }
        return canMakeRequest
    }
}

protocol RateLimiterProtocol {
    init(maxRequests: Int, timeInterval: TimeInterval)
    func allowRequest() -> Bool
}

class RateLimiter: RateLimiterProtocol {
    private let maxRequests: Int
    private let timeInterval: TimeInterval
    private var lastRequestTime: TimeInterval = 0
    
    init(maxRequests: Int, timeInterval: TimeInterval) {
        self.maxRequests = maxRequests
        self.timeInterval = timeInterval
    }
    
    func allowRequest() -> Bool {
        let currentTime = Date().timeIntervalSince1970
        let elapsedTime = currentTime - lastRequestTime
        
        if elapsedTime > timeInterval {
            lastRequestTime = currentTime
            return true
        }
        
        return false
    }
}

 RateLimiterProtocol {
    private let maxRequests: Int
    private let timeInterval: TimeInterval
    private var lastRequestTime: TimeInterval = 0
    
    init(maxRequests: Int, timeInterval: TimeInterval) {
        self.maxRequests = maxRequests
        self.timeInterval = timeInterval
    }
    
    func allowRequest() -> Bool {
        let currentTime = Date().timeIntervalSince1970
        let elapsedTime = currentTime - lastRequestTime
        
        if elapsedTime > timeInterval {
            lastRequestTime = currentTime
            return true
        }
        
        return false
    }
}

protocol RateLimiterProtocol {
    init(maxRequests: Int, timeInterval: TimeInterval)
    func allowRequest() -> Bool
}

class RateLimiter: RateLimiterProtocol {
    private var maxRequests: Int
    private var timeInterval: TimeInterval
    private var lastRequestTime: Date?
    
    init(maxRequests: Int, timeInterval: TimeInterval) {
        self.maxRequests = maxRequests
        self.timeInterval = timeInterval
        self.lastRequestTime = nil
    }
    
    func allowRequest() -> Bool {
        guard let lastRequestTime = lastRequestTime else {
            self.lastRequestTime = Date()
            return true
        }
        
        let currentTime = Date()
        let timeInterval = currentTime.timeIntervalSince(lastRequestTime!)
        
        if timeInterval < self.timeInterval {
            return false
        }
        
        self.lastRequestTime = currentTime
        return true
    }
}

 RateLimiterProtocol {
    private var maxRequests: Int
    private var timeInterval: TimeInterval
    private var lastRequestTime: Date?
    
    init(maxRequests: Int, timeInterval: TimeInterval) {
        self.maxRequests = maxRequests
        self.timeInterval = timeInterval
        self.lastRequestTime = nil
    }
    
    func allowRequest() -> Bool {
        guard let lastRequestTime = lastRequestTime else {
            self.lastRequestTime = Date()
            return true
        }
        
        let currentTime = Date()
        let timeInterval = currentTime.timeIntervalSince(lastRequestTime!)
        
        if timeInterval < self.timeInterval {
            return false
        }
        
        self.lastRequestTime = currentTime
        return true
    }
}

protocol RateLimiterProtocol {
    init(maxRequests: Int, timeInterval: TimeInterval)
    func allowRequest() -> Bool
}

class RateLimiter: RateLimiterProtocol {
    private var maxRequests: Int
    private var timeInterval: TimeInterval
    private var lastRequest: Date?
    
    init(maxRequests: Int, timeInterval: TimeInterval) {
        self.maxRequests = maxRequests
        self.timeInterval = timeInterval
    }
    
    func allowRequest() -> Bool {
        if let lastRequest = lastRequest {
            let timeSinceLastRequest = Date().timeIntervalSince(lastRequest)
            if timeSinceLastRequest < timeInterval {
                return false
            }
        }
        lastRequest = Date()
        return true
    }
}

 RateLimiterProtocol {
    private var maxRequests: Int
    private var timeInterval: TimeInterval
    private var lastRequest: Date?
    
    init(maxRequests: Int, timeInterval: TimeInterval) {
        self.maxRequests = maxRequests
        self.timeInterval = timeInterval
    }
    
    func allowRequest() -> Bool {
        if let lastRequest = lastRequest {
            let timeSinceLastRequest = Date().timeIntervalSince(lastRequest)
            if timeSinceLastRequest < timeInterval {
                return false
            }
        }
        lastRequest = Date()
        return true
    }
}

protocol RateLimiterProtocol {
    init(maxRequests: Int, timeInterval: TimeInterval)
    func allowRequest() -> Bool
}

class RateLimiter: RateLimiterProtocol {
    private let maxRequests: Int
    private let timeInterval: TimeInterval
    private var lastRequestTime: TimeInterval = 0

    init(maxRequests: Int, timeInterval: TimeInterval) {
        self.maxRequests = maxRequests
        self.timeInterval = timeInterval
    }

    func allowRequest() -> Bool {
        let currentTime = Date().timeIntervalSinceReferenceDate
        let elapsedTime = currentTime - lastRequestTime
        let requestsCount = maxRequests - Int(elapsedTime / timeInterval)
        if requestsCount > 0 {
            lastRequestTime = currentTime
            return true
        }
        return false
    }
}

 RateLimiterProtocol {
    private let maxRequests: Int
    private let timeInterval: TimeInterval
    private var lastRequestTime: TimeInterval = 0

    init(maxRequests: Int, timeInterval: TimeInterval) {
        self.maxRequests = maxRequests
        self.timeInterval = timeInterval
    }

    func allowRequest() -> Bool {
        let currentTime = Date().timeIntervalSinceReferenceDate
        let elapsedTime = currentTime - lastRequestTime
        let requestsCount = maxRequests - Int(elapsedTime / timeInterval)
        if requestsCount > 0 {
            lastRequestTime = currentTime
            return true
        }
        return false
    }
}

protocol RateLimiterProtocol {
    init(maxRequests: Int, timeInterval: TimeInterval)
    func allowRequest() -> Bool
}

class RateLimiter: RateLimiterProtocol {
    private var maxRequests: Int
    private var timeInterval: TimeInterval
    private var lastRequestTime: TimeInterval
    private var requestsCount: Int

    init(maxRequests: Int, timeInterval: TimeInterval) {
        self.maxRequests = maxRequests
        self.timeInterval = timeInterval
        self.lastRequestTime = 0
        self.requestsCount = 0
    }

    func allowRequest() -> Bool {
        let currentTime = Date().timeIntervalSince1970
        if (currentTime - lastRequestTime) >= timeInterval {
            requestsCount = 0
        }
        if requestsCount < maxRequests {
            requestsCount += 1
            lastRequestTime = currentTime
            return true
        }
        return false
    }
}

 RateLimiterProtocol {
    private var maxRequests: Int
    private var timeInterval: TimeInterval
    private var lastRequestTime: TimeInterval
    private var requestsCount: Int

    init(maxRequests: Int, timeInterval: TimeInterval) {
        self.maxRequests = maxRequests
        self.timeInterval = timeInterval
        self.lastRequestTime = 0
        self.requestsCount = 0
    }

    func allowRequest() -> Bool {
        let currentTime = Date().timeIntervalSince1970
        if (currentTime - lastRequestTime) >= timeInterval {
            requestsCount = 0
        }
        if requestsCount < maxRequests {
            requestsCount += 1
            lastRequestTime = currentTime
            return true
        }
        return false
    }
}

protocol RateLimiterProtocol {
    init(maxRequests: Int, timeInterval: TimeInterval)
    func allowRequest() -> Bool
}

class RateLimiter: RateLimiterProtocol {
    private var maxRequests: Int
    private var timeInterval: TimeInterval
    private var lastRequestTime: TimeInterval
    private var requestsCount: Int
    
    init(maxRequests: Int, timeInterval: TimeInterval) {
        self.maxRequests = maxRequests
        self.timeInterval = timeInterval
        self.lastRequestTime = 0
        self.requestsCount = 0
    }
    
    func allowRequest() -> Bool {
        let currentTime = Date().timeIntervalSince1970
        if currentTime - lastRequestTime > timeInterval {
            lastRequestTime = currentTime
            requestsCount = 0
            return true
        }
        
        if requestsCount < maxRequests {
            requestsCount += 1
            return true
        }
        
        return false
    }
}

 RateLimiterProtocol {
    private var maxRequests: Int
    private var timeInterval: TimeInterval
    private var lastRequestTime: TimeInterval
    private var requestsCount: Int
    
    init(maxRequests: Int, timeInterval: TimeInterval) {
        self.maxRequests = maxRequests
        self.timeInterval = timeInterval
        self.lastRequestTime = 0
        self.requestsCount = 0
    }
    
    func allowRequest() -> Bool {
        let currentTime = Date().timeIntervalSince1970
        if currentTime - lastRequestTime > timeInterval {
            lastRequestTime = currentTime
            requestsCount = 0
            return true
        }
        
        if requestsCount < maxRequests {
            requestsCount += 1
            return true
        }
        
        return false
    }
}

protocol ThreadSafeCounterProtocol {
    init(value: Int)
    func increment()
    func currentValue() -> Int
}

class ThreadSafeCounter: ThreadSafeCounterProtocol {
    private var value: Int
    
    init(value: Int) {
        self.value = value
    }
    
    func increment() {
        value += 1
    }
    
    func currentValue() -> Int {
        return value
    }
}

 {
    private var value: Int
    
    init(value: Int) {
        self.value = value
    }
    
    func increment() {
        value += 1
    }
    
    func currentValue() -> Int {
        return value
    }
}

protocol ThreadSafeCounterProtocol {
    init(value: Int)
    func increment()
    func currentValue() -> Int
}

class ThreadSafeCounter: ThreadSafeCounterProtocol {
    private var value: Int
    
    init(value: Int) {
        self.value = value
    }
    
    func increment() {
        value += 1
    }
    
    func currentValue() -> Int {
        return value
    }
}

 {
    private var value: Int
    
    init(value: Int) {
        self.value = value
    }
    
    func increment() {
        value += 1
    }
    
    func currentValue() -> Int {
        return value
    }
}

protocol ThreadSafeCounterProtocol {
    init(value: Int)
    func increment()
    func currentValue() -> Int
}

class ThreadSafeCounter: ThreadSafeCounterProtocol {
    private var value: Int
    
    init(value: Int) {
        self.value = value
    }
    
    func increment() {
        value += 1
    }
    
    func currentValue() -> Int {
        return value
    }
}

 {
    private var value: Int
    
    init(value: Int) {
        self.value = value
    }
    
    func increment() {
        value += 1
    }
    
    func currentValue() -> Int {
        return value
    }
}

protocol ThreadSafeCounterProtocol {
    init(value: Int)
    func increment()
    func currentValue() -> Int
}

class ThreadSafeCounter: ThreadSafeCounterProtocol {
    private var value: Int
    
    init(value: Int) {
        self.value = value
    }
    
    func increment() {
        value += 1
    }
    
    func currentValue() -> Int {
        return value
    }
}

 {
    private var value: Int
    
    init(value: Int) {
        self.value = value
    }
    
    func increment() {
        value += 1
    }
    
    func currentValue() -> Int {
        return value
    }
}

protocol ThreadSafeCounterProtocol {
    init(value: Int)
    func increment()
    func currentValue() -> Int
}

class ThreadSafeCounter: ThreadSafeCounterProtocol {
    private var value: Int
    
    init(value: Int) {
        self.value = value
    }
    
    func increment() {
        value += 1
    }
    
    func currentValue() -> Int {
        return value
    }
}

 {
    private var value: Int
    
    init(value: Int) {
        self.value = value
    }
    
    func increment() {
        value += 1
    }
    
    func currentValue() -> Int {
        return value
    }
}

protocol ThreadSafeCounterProtocol {
    init(value: Int)
    func increment()
    func currentValue() -> Int
}

class ThreadSafeCounter: ThreadSafeCounterProtocol {
    private var value: Int
    
    init(value: Int) {
        self.value = value
    }
    
    func increment() {
        value += 1
    }
    
    func currentValue() -> Int {
        return value
    }
}

 {
    private var value: Int
    
    init(value: Int) {
        self.value = value
    }
    
    func increment() {
        value += 1
    }
    
    func currentValue() -> Int {
        return value
    }
}

protocol ThreadSafeCounterProtocol {
    init(value: Int)
    func increment()
    func currentValue() -> Int
}

class ThreadSafeCounter: ThreadSafeCounterProtocol {
    private var value: Int
    
    init(value: Int) {
        self.value = value
    }
    
    func increment() {
        value += 1
    }
    
    func currentValue() -> Int {
        return value
    }
}

 {
    private var value: Int
    
    init(value: Int) {
        self.value = value
    }
    
    func increment() {
        value += 1
    }
    
    func currentValue() -> Int {
        return value
    }
}

protocol ThreadSafeCounterProtocol {
    init(value: Int)
    func increment()
    func currentValue() -> Int
}

class ThreadSafeCounter: ThreadSafeCounterProtocol {
    private var value: Int
    
    init(value: Int) {
        self.value = value
    }
    
    func increment() {
        value += 1
    }
    
    func currentValue() -> Int {
        return value
    }
}

 {
    private var value: Int
    
    init(value: Int) {
        self.value = value
    }
    
    func increment() {
        value += 1
    }
    
    func currentValue() -> Int {
        return value
    }
}

protocol ThreadSafeCounterProtocol {
    init(value: Int)
    func increment()
    func currentValue() -> Int
}

class ThreadSafeCounter: ThreadSafeCounterProtocol {
    private var value: Int = 0
    
    init(value: Int) {
        self.value = value
    }
    
    func increment() {
        value += 1
    }
    
    func currentValue() -> Int {
        return value
    }
}

 {
    private var value: Int = 0
    
    init(value: Int) {
        self.value = value
    }
    
    func increment() {
        value += 1
    }
    
    func currentValue() -> Int {
        return value
    }
}

protocol ThreadSafeCounterProtocol {
    init(value: Int)
    func increment()
    func currentValue() -> Int
}

class ThreadSafeCounter: ThreadSafeCounterProtocol {
    private var value: Int
    
    init(value: Int) {
        self.value = value
    }
    
    func increment() {
        value += 1
    }
    
    func currentValue() -> Int {
        return value
    }
}

 {
    private var value: Int
    
    init(value: Int) {
        self.value = value
    }
    
    func increment() {
        value += 1
    }
    
    func currentValue() -> Int {
        return value
    }
}

protocol PipelineProtocol {
    associatedtype Output
    init(value: Output)
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
    func execute() -> Output
}

class Pipeline<Output> {
    private var value: Output
    
    init(value: Output) {
        self.value = value
    }
    
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
        return Pipeline(value: transform(value))
    }
    
    func execute() -> Output {
        return value
    }
}

Output> {
    private var value: Output
    
    init(value: Output) {
        self.value = value
    }
    
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
        return Pipeline(value: transform(value))
    }
    
    func execute() -> Output {
        return value
    }
}

protocol PipelineProtocol {
    associatedtype Output
    init(value: Output)
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
    func execute() -> Output
}

class Pipeline<Output> {
    private var value: Output
    
    init(value: Output) {
        self.value = value
    }
    
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
        return Pipeline(value: transform(value))
    }
    
    func execute() -> Output {
        return value
    }
}

Output> {
    private var value: Output
    
    init(value: Output) {
        self.value = value
    }
    
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
        return Pipeline(value: transform(value))
    }
    
    func execute() -> Output {
        return value
    }
}

protocol PipelineProtocol {
    associatedtype Output
    init(value: Output)
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
    func execute() -> Output
}

class Pipeline<T>: PipelineProtocol {
    private var value: T
    
    init(value: T) {
        self.value = value
    }
    
    func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
        return Pipeline(value: transform(value))
    }
    
    func execute() -> T {
        return value
    }
}

T>: PipelineProtocol {
    private var value: T
    
    init(value: T) {
        self.value = value
    }
    
    func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
        return Pipeline(value: transform(value))
    }
    
    func execute() -> T {
        return value
    }
}

protocol PipelineProtocol {
    associatedtype Output
    init(value: Output)
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
    func execute() -> Output
}

class Pipeline<T> {
    private var value: T
    
    init(value: T) {
        self.value = value
    }
    
    func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
        return Pipeline(value: transform(value))
    }
    
    func execute() -> T {
        return value
    }
}

T> {
    private var value: T
    
    init(value: T) {
        self.value = value
    }
    
    func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
        return Pipeline(value: transform(value))
    }
    
    func execute() -> T {
        return value
    }
}

protocol PipelineProtocol {
    associatedtype Output
    init(value: Output)
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
    func execute() -> Output
}

class Pipeline<Output> {
    private var value: Output?
    
    init(value: Output) {
        self.value = value
    }
    
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
        return Pipeline(value: transform(value!))
    }
    
    func execute() -> Output {
        return value!
    }
}

Output> {
    private var value: Output?
    
    init(value: Output) {
        self.value = value
    }
    
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
        return Pipeline(value: transform(value!))
    }
    
    func execute() -> Output {
        return value!
    }
}

let pipeline = Pipeline(value: 1)
    .pipe { $0 + 1 }
    .pipe { $0 * 2 }
    .execute()

protocol PipelineProtocol {
    associatedtype Output
    init(value: Output)
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
    func execute() -> Output
}

class Pipeline<Output> {
    private var value: Output
    
    init(value: Output) {
        self.value = value
    }
    
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
        return Pipeline(value: transform(value))
    }
    
    func execute() -> Output {
        return value
    }
}

Output> {
    private var value: Output
    
    init(value: Output) {
        self.value = value
    }
    
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
        return Pipeline(value: transform(value))
    }
    
    func execute() -> Output {
        return value
    }
}

protocol PipelineProtocol {
    associatedtype Output
    init(value: Output)
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
    func execute() -> Output
}

class Pipeline<Output> {
    private var value: Output
    
    init(value: Output) {
        self.value = value
    }
    
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
        return Pipeline(value: transform(value))
    }
    
    func execute() -> Output {
        return value
    }
}

Output> {
    private var value: Output
    
    init(value: Output) {
        self.value = value
    }
    
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
        return Pipeline(value: transform(value))
    }
    
    func execute() -> Output {
        return value
    }
}

protocol PipelineProtocol {
    associatedtype Output
    init(value: Output)
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
    func execute() -> Output
}

class Pipeline<T>: PipelineProtocol {
    private var value: T
    
    init(value: T) {
        self.value = value
    }
    
    func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
        return Pipeline(value: transform(value))
    }
    
    func execute() -> T {
        return value
    }
}

T>: PipelineProtocol {
    private var value: T
    
    init(value: T) {
        self.value = value
    }
    
    func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
        return Pipeline(value: transform(value))
    }
    
    func execute() -> T {
        return value
    }
}

protocol PipelineProtocol {
    associatedtype Output
    init(value: Output)
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
    func execute() -> Output
}

class Pipeline<Output>: PipelineProtocol {
    private var value: Output
    
    init(value: Output) {
        self.value = value
    }
    
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
        return Pipeline(value: transform(value))
    }
    
    func execute() -> Output {
        return value
    }
}

Output>: PipelineProtocol {
    private var value: Output
    
    init(value: Output) {
        self.value = value
    }
    
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
        return Pipeline(value: transform(value))
    }
    
    func execute() -> Output {
        return value
    }
}

protocol PipelineProtocol {
    associatedtype Output
    init(value: Output)
    func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
    func execute() -> Output
}

class Pipeline<T>: PipelineProtocol {
    private var value: T
    
    init(value: T) {
        self.value = value
    }
    
    func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
        return Pipeline(value: transform(value))
    }
    
    func execute() -> T {
        return value
    }
}

T>: PipelineProtocol {
    private var value: T
    
    init(value: T) {
        self.value = value
    }
    
    func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
        return Pipeline(value: transform(value))
    }
    
    func execute() -> T {
        return value
    }
}

protocol ObservablePropertyProtocol {
    associatedtype Value
    init(value: Value)
    var value: Value { get set }
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
    func unsubscribe(_ observer: UUID)
}

class ObservableProperty<Value>: ObservablePropertyProtocol {
    private var observers: [UUID: (Value) -> Void] = [:]
    private var value: Value
    
    init(value: Value) {
        self.value = value
    }
    
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
        let observerId = UUID()
        observers[observerId] = observer
        return observerId
    }
    
    func unsubscribe(_ observer: UUID) {
        observers.removeValue(forKey: observer)
    }
    
    var value: Value {
        get {
            return value
        }
        set {
            value = newValue
            observers.forEach { (_, observer) in
                observer(value)
            }
        }
    }
}

: ObservablePropertyProtocol {
    private var observers: [UUID: (Value) -> Void] = [:]
    private var value: Value
    
    init(value: Value) {
        self.value = value
    }
    
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
        let observerId = UUID()
        observers[observerId] = observer
        return observerId
    }
    
    func unsubscribe(_ observer: UUID) {
        observers.removeValue(forKey: observer)
    }
    
    var value: Value {
        get {
            return value
        }
        set {
            value = newValue
            observers.forEach { (_, observer) in
                observer(value)
            }
        }
    }
}

protocol ObservablePropertyProtocol {
    associatedtype Value
    init(value: Value)
    var value: Value { get set }
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
    func unsubscribe(_ observer: UUID)
}

class ObservableProperty<Value>: ObservablePropertyProtocol {
    private var observers: [UUID: (Value) -> Void] = [:]
    private var value: Value
    
    init(value: Value) {
        self.value = value
    }
    
    var value: Value {
        get {
            return value
        }
        set {
            value = newValue
            observers.forEach { (_, observer) in
                observer(value)
            }
        }
    }
    
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
        let observerID = UUID()
        observers[observerID] = observer
        return observerID
    }
    
    func unsubscribe(_ observer: UUID) {
        observers.removeValue(forKey: observer)
    }
}

: ObservablePropertyProtocol {
    private var observers: [UUID: (Value) -> Void] = [:]
    private var value: Value
    
    init(value: Value) {
        self.value = value
    }
    
    var value: Value {
        get {
            return value
        }
        set {
            value = newValue
            observers.forEach { (_, observer) in
                observer(value)
            }
        }
    }
    
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
        let observerID = UUID()
        observers[observerID] = observer
        return observerID
    }
    
    func unsubscribe(_ observer: UUID) {
        observers.removeValue(forKey: observer)
    }
}

protocol ObservablePropertyProtocol {
    associatedtype Value
    init(value: Value)
    var value: Value { get set }
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
    func unsubscribe(_ observer: UUID)
}

class ObservableProperty<Value>: ObservablePropertyProtocol {
    private var observers: [UUID: (Value) -> Void] = [:]
    private var value: Value
    
    init(value: Value) {
        self.value = value
    }
    
    var value: Value {
        get {
            return value
        }
        set {
            value = newValue
            observers.forEach { (_, observer) in
                observer(value)
            }
        }
    }
    
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
        let observerID = UUID()
        observers[observerID] = observer
        return observerID
    }
    
    func unsubscribe(_ observer: UUID) {
        observers.removeValue(forKey: observer)
    }
}

: ObservablePropertyProtocol {
    private var observers: [UUID: (Value) -> Void] = [:]
    private var value: Value
    
    init(value: Value) {
        self.value = value
    }
    
    var value: Value {
        get {
            return value
        }
        set {
            value = newValue
            observers.forEach { (_, observer) in
                observer(value)
            }
        }
    }
    
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
        let observerID = UUID()
        observers[observerID] = observer
        return observerID
    }
    
    func unsubscribe(_ observer: UUID) {
        observers.removeValue(forKey: observer)
    }
}

protocol ObservablePropertyProtocol {
    associatedtype Value
    init(value: Value)
    var value: Value { get set }
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
    func unsubscribe(_ observer: UUID)
}

class ObservableProperty<Value>: ObservablePropertyProtocol {
    var value: Value { get set }
    init(value: Value) {
        self.value = value
    }
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
        return UUID()
    }
    func unsubscribe(_ observer: UUID) { }
}

: ObservablePropertyProtocol {
    var value: Value { get set }
    init(value: Value) {
        self.value = value
    }
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
        return UUID()
    }
    func unsubscribe(_ observer: UUID) { }
}

protocol ObservablePropertyProtocol {
    associatedtype Value
    init(value: Value)
    var value: Value { get set }
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
    func unsubscribe(_ observer: UUID)
}

class ObservableProperty<Value>: ObservablePropertyProtocol {
    private var observers: [UUID: (Value) -> Void] = [:]
    private var value: Value
    
    init(value: Value) {
        self.value = value
    }
    
    var value: Value {
        get {
            return value
        }
        set {
            value = newValue
            observers.forEach { (_, observer) in
                observer(newValue)
            }
        }
    }
    
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
        let observerID = UUID()
        observers[observerID] = observer
        return observerID
    }
    
    func unsubscribe(_ observer: UUID) {
        observers.removeValue(forKey: observer)
    }
}

: ObservablePropertyProtocol {
    private var observers: [UUID: (Value) -> Void] = [:]
    private var value: Value
    
    init(value: Value) {
        self.value = value
    }
    
    var value: Value {
        get {
            return value
        }
        set {
            value = newValue
            observers.forEach { (_, observer) in
                observer(newValue)
            }
        }
    }
    
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
        let observerID = UUID()
        observers[observerID] = observer
        return observerID
    }
    
    func unsubscribe(_ observer: UUID) {
        observers.removeValue(forKey: observer)
    }
}

protocol ObservablePropertyProtocol {
    associatedtype Value
    init(value: Value)
    var value: Value { get set }
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
    func unsubscribe(_ observer: UUID)
}

class ObservableProperty<Value>: ObservablePropertyProtocol {
    private var observers: [UUID: (Value) -> Void] = [:]
    private var value: Value
    
    init(value: Value) {
        self.value = value
    }
    
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
        let observerID = UUID()
        observers[observerID] = observer
        return observerID
    }
    
    func unsubscribe(_ observer: UUID) {
        observers.removeValue(forKey: observer)
    }
    
    var value: Value {
        get {
            return value
        }
        set {
            value = newValue
            observers.forEach { (_, observer) in
                observer(newValue)
            }
        }
    }
}

: ObservablePropertyProtocol {
    private var observers: [UUID: (Value) -> Void] = [:]
    private var value: Value
    
    init(value: Value) {
        self.value = value
    }
    
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
        let observerID = UUID()
        observers[observerID] = observer
        return observerID
    }
    
    func unsubscribe(_ observer: UUID) {
        observers.removeValue(forKey: observer)
    }
    
    var value: Value {
        get {
            return value
        }
        set {
            value = newValue
            observers.forEach { (_, observer) in
                observer(newValue)
            }
        }
    }
}

protocol ObservablePropertyProtocol {
    associatedtype Value
    init(value: Value)
    var value: Value { get set }
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
    func unsubscribe(_ observer: UUID)
}

class ObservableProperty<Value>: ObservablePropertyProtocol {
    private var observers: [UUID: (Value) -> Void] = [:]
    private var value: Value
    
    init(value: Value) {
        self.value = value
    }
    
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
        let observerID = UUID()
        observers[observerID] = observer
        return observerID
    }
    
    func unsubscribe(_ observer: UUID) {
        observers.removeValue(forKey: observer)
    }
    
    var value: Value {
        get {
            return value
        }
        set {
            value = newValue
            observers.forEach { (_, observer) in
                observer(newValue)
            }
        }
    }
}

: ObservablePropertyProtocol {
    private var observers: [UUID: (Value) -> Void] = [:]
    private var value: Value
    
    init(value: Value) {
        self.value = value
    }
    
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
        let observerID = UUID()
        observers[observerID] = observer
        return observerID
    }
    
    func unsubscribe(_ observer: UUID) {
        observers.removeValue(forKey: observer)
    }
    
    var value: Value {
        get {
            return value
        }
        set {
            value = newValue
            observers.forEach { (_, observer) in
                observer(newValue)
            }
        }
    }
}

protocol ObservablePropertyProtocol {
    associatedtype Value
    init(value: Value)
    var value: Value { get set }
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
    func unsubscribe(_ observer: UUID)
}

class ObservableProperty<Value>: ObservablePropertyProtocol {
    private var observers: [UUID: (Value) -> Void] = [:]
    private var value: Value
    
    init(value: Value) {
        self.value = value
    }
    
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
        let observerID = UUID()
        observers[observerID] = observer
        return observerID
    }
    
    func unsubscribe(_ observer: UUID) {
        observers.removeValue(forKey: observer)
    }
    
    var value: Value {
        get {
            return value
        }
        set {
            value = newValue
            observers.forEach { (_, observer) in
                observer(newValue)
            }
        }
    }
}

: ObservablePropertyProtocol {
    private var observers: [UUID: (Value) -> Void] = [:]
    private var value: Value
    
    init(value: Value) {
        self.value = value
    }
    
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
        let observerID = UUID()
        observers[observerID] = observer
        return observerID
    }
    
    func unsubscribe(_ observer: UUID) {
        observers.removeValue(forKey: observer)
    }
    
    var value: Value {
        get {
            return value
        }
        set {
            value = newValue
            observers.forEach { (_, observer) in
                observer(newValue)
            }
        }
    }
}

protocol ObservablePropertyProtocol {
    associatedtype Value
    init(value: Value)
    var value: Value { get set }
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
    func unsubscribe(_ observer: UUID)
}

class ObservableProperty<Value>: ObservablePropertyProtocol {
    private var observers: [UUID: (Value) -> Void] = [:]
    private var value: Value
    
    init(value: Value) {
        self.value = value
    }
    
    var value: Value {
        get {
            return value
        }
        set {
            value = newValue
            observers.forEach { (_, observer) in
                observer(value)
            }
        }
    }
    
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
        let observerID = UUID()
        observers[observerID] = observer
        return observerID
    }
    
    func unsubscribe(_ observer: UUID) {
        observers.removeValue(forKey: observer)
    }
}

: ObservablePropertyProtocol {
    private var observers: [UUID: (Value) -> Void] = [:]
    private var value: Value
    
    init(value: Value) {
        self.value = value
    }
    
    var value: Value {
        get {
            return value
        }
        set {
            value = newValue
            observers.forEach { (_, observer) in
                observer(value)
            }
        }
    }
    
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
        let observerID = UUID()
        observers[observerID] = observer
        return observerID
    }
    
    func unsubscribe(_ observer: UUID) {
        observers.removeValue(forKey: observer)
    }
}

protocol ObservablePropertyProtocol {
    associatedtype Value
    init(value: Value)
    var value: Value { get set }
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
    func unsubscribe(_ observer: UUID)
}

class ObservableProperty<Value>: ObservablePropertyProtocol {
    var value: Value { get set }
    init(value: Value) {
        self.value = value
    }
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
        return UUID()
    }
    func unsubscribe(_ observer: UUID) {
        //
    }
}

: ObservablePropertyProtocol {
    var value: Value { get set }
    init(value: Value) {
        self.value = value
    }
    func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
        return UUID()
    }
    func unsubscribe(_ observer: UUID) {
        //
    }
}

protocol ClampedProtocol {
    associatedtype Value: Comparable
    init(wrappedValue: Value, _ range: ClosedRange<Value>)
}

@propertyWrapper
struct Clamped<Value: Comparable> {
    var wrappedValue: Value
    var range: ClampedProtocol<Value>
    
    init(wrappedValue: Value, range: ClampedProtocol<Value>) {
        self.wrappedValue = wrappedValue
        self.range = range
    }
    
    var wrappedValue: Value {
        get {
            return self.range.wrappedValue
        }
        set {
            self.range.wrappedValue = newValue
        }
    }
}

Value: Comparable> {
    var wrappedValue: Value
    var range: ClampedProtocol<Value>
    
    init(wrappedValue: Value, range: ClampedProtocol<Value>) {
        self.wrappedValue = wrappedValue
        self.range = range
    }
    
    var wrappedValue: Value {
        get {
            return self.range.wrappedValue
        }
        set {
            self.range.wrappedValue = newValue
        }
    }
}

protocol ClampedProtocol {
    associatedtype Value: Comparable
    init(wrappedValue: Value, _ range: ClosedRange<Value>)
}

@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
    typealias Value = Value
    
    var wrappedValue: Value
    var range: ClampedRange<Value>
    
    init(wrappedValue: Value, range: ClampedRange<Value>) {
        self.wrappedValue = wrappedValue
        self.range = range
    }
    
    var wrappedValue: Value {
        get {
            return self.range.contains(self.wrappedValue) ? self.wrappedValue : self.range.lowerBound
        }
        set {
            self.wrappedValue = self.range.contains(newValue) ? newValue : self.range.lowerBound
        }
    }
    
    func updateValue(newValue: Value) {
        self.wrappedValue = self.range.contains(newValue) ? newValue : self.range.lowerBound
    }
}

struct ClampedRange<Value: Comparable> {
    let lowerBound: Value
    let upperBound: Value
    
    init(lowerBound: Value, upperBound: Value) {
        self.lowerBound = lowerBound
        self.upperBound = upperBound
    }
    
    func contains(_ value: Value) -> Bool {
        return lowerBound <= value && value <= upperBound
    }
}

Value: Comparable>: ClampedProtocol {
    typealias Value = Value
    
    var wrappedValue: Value
    var range: ClampedRange<Value>
    
    init(wrappedValue: Value, range: ClampedRange<Value>) {
        self.wrappedValue = wrappedValue
        self.range = range
    }
    
    var wrappedValue: Value {
        get {
            return self.range.contains(self.wrappedValue) ? self.wrappedValue : self.range.lowerBound
        }
        set {
            self.wrappedValue = self.range.contains(newValue) ? newValue : self.range.lowerBound
        }
    }
    
    func updateValue(newValue: Value) {
        self.wrappedValue = self.range.contains(newValue) ? newValue : self.range.lowerBound
    }
}

struct ClampedRange<Value: Comparable> {
    let lowerBound: Value
    let upperBound: Value
    
    init(lowerBound: Value, upperBound: Value) {
        self.lowerBound = lowerBound
        self.upperBound = upperBound
    }
    
    func contains(_ value: Value) -> Bool {
        return lowerBound <= value && value <= upperBound
    }
}

protocol ClampedProtocol {
    associatedtype Value: Comparable
    init(wrappedValue: Value, _ range: ClosedRange<Value>)
}

@propertyWrapper
struct Clamped<Value: Comparable> {
    var wrappedValue: Value
    var range: ClampedProtocol<Value>
    
    init(wrappedValue: Value, range: ClampedProtocol<Value>) {
        self.wrappedValue = wrappedValue
        self.range = range
    }
    
    var wrappedValue: Value {
        get {
            return self.range.wrappedValue
        }
        set {
            self.range.wrappedValue = newValue
        }
    }
}

Value: Comparable> {
    var wrappedValue: Value
    var range: ClampedProtocol<Value>
    
    init(wrappedValue: Value, range: ClampedProtocol<Value>) {
        self.wrappedValue = wrappedValue
        self.range = range
    }
    
    var wrappedValue: Value {
        get {
            return self.range.wrappedValue
        }
        set {
            self.range.wrappedValue = newValue
        }
    }
}

protocol ClampedProtocol {
    associatedtype Value: Comparable
    init(wrappedValue: Value, _ range: ClosedRange<Value>)
}

@propertyWrapper
struct Clamped<Value: Comparable> {
    var wrappedValue: Value
    let range: ClampedProtocol<Value>
    
    init(wrappedValue: Value, range: ClampedProtocol<Value>) {
        self.wrappedValue = wrappedValue
        self.range = range
    }
    
    var wrappedValue: Value {
        get {
            return self.wrappedValue
        }
        set {
            self.wrappedValue = self.range.wrappedValue.clamp(to: self.range.wrappedValue)
        }
    }
}

Value: Comparable> {
    var wrappedValue: Value
    let range: ClampedProtocol<Value>
    
    init(wrappedValue: Value, range: ClampedProtocol<Value>) {
        self.wrappedValue = wrappedValue
        self.range = range
    }
    
    var wrappedValue: Value {
        get {
            return self.wrappedValue
        }
        set {
            self.wrappedValue = self.range.wrappedValue.clamp(to: self.range.wrappedValue)
        }
    }
}

protocol ClampedProtocol {
    associatedtype Value: Comparable
    init(wrappedValue: Value, _ range: ClosedRange<Value>)
}

@propertyWrapper
struct Clamped<Value: Comparable> {
    private let range: ClampedProtocol.Value
    private let value: ClampedProtocol.Value
    
    public init(wrappedValue: Value, _ range: ClampedProtocol.Value) {
        self.range = range
        self.value = wrappedValue
    }
    
    public var wrappedValue: ClampedProtocol.Value {
        get {
            return self.value
        }
        set {
            self.value = max(min(newValue, self.range.upperBound), self.range.lowerBound)
        }
    }
}

Value: Comparable> {
    private let range: ClampedProtocol.Value
    private let value: ClampedProtocol.Value
    
    public init(wrappedValue: Value, _ range: ClampedProtocol.Value) {
        self.range = range
        self.value = wrappedValue
    }
    
    public var wrappedValue: ClampedProtocol.Value {
        get {
            return self.value
        }
        set {
            self.value = max(min(newValue, self.range.upperBound), self.range.lowerBound)
        }
    }
}

protocol ClampedProtocol {
    associatedtype Value: Comparable
    init(wrappedValue: Value, _ range: ClosedRange<Value>)
}

@propertyWrapper
struct Clamped<Value: Comparable> {
    var wrappedValue: Value
    var range: ClampedProtocol<Value>
    
    init(wrappedValue: Value, range: ClampedProtocol<Value>) {
        self.wrappedValue = wrappedValue
        self.range = range
    }
    
    var wrappedValue: Value {
        get {
            return self.range.wrappedValue
        }
        set {
            if self.wrappedValue < self.range.start {
                self.wrappedValue = self.range.start
            } else if self.wrappedValue > self.range.end {
                self.wrappedValue = self.range.end
            }
        }
    }
}

Value: Comparable> {
    var wrappedValue: Value
    var range: ClampedProtocol<Value>
    
    init(wrappedValue: Value, range: ClampedProtocol<Value>) {
        self.wrappedValue = wrappedValue
        self.range = range
    }
    
    var wrappedValue: Value {
        get {
            return self.range.wrappedValue
        }
        set {
            if self.wrappedValue < self.range.start {
                self.wrappedValue = self.range.start
            } else if self.wrappedValue > self.range.end {
                self.wrappedValue = self.range.end
            }
        }
    }
}

protocol ClampedProtocol {
    associatedtype Value: Comparable
    init(wrappedValue: Value, _ range: ClosedRange<Value>)
}

@propertyWrapper
struct Clamped<Value: Comparable> {
    var wrappedValue: Value
    var range: ClampedProtocol<Value>
    
    init(wrappedValue: Value, range: ClampedProtocol<Value>) {
        self.wrappedValue = wrappedValue
        self.range = range
    }
    
    var wrappedValue: Value {
        get {
            return self.range.wrappedValue
        }
        set {
            if self.wrappedValue < self.range.minValue || self.wrappedValue > self.range.maxValue {
                self.wrappedValue = self.range.minValue
            }
        }
    }
}

Value: Comparable> {
    var wrappedValue: Value
    var range: ClampedProtocol<Value>
    
    init(wrappedValue: Value, range: ClampedProtocol<Value>) {
        self.wrappedValue = wrappedValue
        self.range = range
    }
    
    var wrappedValue: Value {
        get {
            return self.range.wrappedValue
        }
        set {
            if self.wrappedValue < self.range.minValue || self.wrappedValue > self.range.maxValue {
                self.wrappedValue = self.range.minValue
            }
        }
    }
}

protocol ClampedProtocol {
    associatedtype Value: Comparable
    init(wrappedValue: Value, _ range: ClosedRange<Value>)
}

@propertyWrapper
struct Clamped<Value: Comparable> {
    var wrappedValue: Value
    let range: ClampedProtocol<Value>
    
    init(wrappedValue: Value, range: ClampedProtocol<Value>) {
        self.wrappedValue = wrappedValue
        self.range = range
    }
    
    var wrappedValue: Value {
        didSet {
            if wrappedValue < range.range.lowerBound || wrappedValue > range.range.upperBound {
                wrappedValue = range.range.lowerBound
            }
        }
    }
}

Value: Comparable> {
    var wrappedValue: Value
    let range: ClampedProtocol<Value>
    
    init(wrappedValue: Value, range: ClampedProtocol<Value>) {
        self.wrappedValue = wrappedValue
        self.range = range
    }
    
    var wrappedValue: Value {
        didSet {
            if wrappedValue < range.range.lowerBound || wrappedValue > range.range.upperBound {
                wrappedValue = range.range.lowerBound
            }
        }
    }
}

protocol ClampedProtocol {
    associatedtype Value: Comparable
    init(wrappedValue: Value, _ range: ClosedRange<Value>)
}

@propertyWrapper
struct Clamped<Value: Comparable> {
    var wrappedValue: Value
    let range: ClampedProtocol<Value>
    
    init(wrappedValue: Value, range: ClampedProtocol<Value>) {
        self.wrappedValue = wrappedValue
        self.range = range
    }
    
    var wrappedValue: Value {
        get {
            return self.range.wrappedValue
        }
        set {
            self.wrappedValue = self.range.wrappedValue
        }
    }
}

Value: Comparable> {
    var wrappedValue: Value
    let range: ClampedProtocol<Value>
    
    init(wrappedValue: Value, range: ClampedProtocol<Value>) {
        self.wrappedValue = wrappedValue
        self.range = range
    }
    
    var wrappedValue: Value {
        get {
            return self.range.wrappedValue
        }
        set {
            self.wrappedValue = self.range.wrappedValue
        }
    }
}

protocol ClampedProtocol {
    associatedtype Value: Comparable
    init(wrappedValue: Value, _ range: ClosedRange<Value>)
}

@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
    typealias Value = Value
    
    var wrappedValue: Value
    var range: ClampedRange<Value>
    
    init(wrappedValue: Value, _ range: ClampedRange<Value>) {
        self.wrappedValue = wrappedValue
        self.range = range
    }
    
    var wrappedValue: Value {
        get {
            return self.range.contains(self.wrappedValue) ? self.wrappedValue : self.range.lowerBound
        }
        set {
            if !self.range.contains(newValue) {
                self.wrappedValue = self.range.lowerBound
            } else {
                self.wrappedValue = newValue
            }
        }
    }
}

Value: Comparable>: ClampedProtocol {
    typealias Value = Value
    
    var wrappedValue: Value
    var range: ClampedRange<Value>
    
    init(wrappedValue: Value, _ range: ClampedRange<Value>) {
        self.wrappedValue = wrappedValue
        self.range = range
    }
    
    var wrappedValue: Value {
        get {
            return self.range.contains(self.wrappedValue) ? self.wrappedValue : self.range.lowerBound
        }
        set {
            if !self.range.contains(newValue) {
                self.wrappedValue = self.range.lowerBound
            } else {
                self.wrappedValue = newValue
            }
        }
    }
}

enum Event {
    case get, set
}

protocol LoggedProtocol {
    associatedtype Value
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}

@propertyWrapper
struct Logged<T: LoggedProtocol> {
    var wrappedValue: T
    var logger: (Event, T.Value) -> Void
    
    init(wrappedValue: T, logger: @escaping (Event, T.Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    var wrappedValue: T {
        didSet {
            logger(Event.set, wrappedValue)
        }
    }
}

class User {
    @Logged(logger: { (event, value) in
        print("\(event.rawValue) \(value)")
    }) var name: String
    
    @Logged(logger: { (event, value) in
        print("\(event.rawValue) \(value)")
    }) var age: Int
}

T: LoggedProtocol> {
    var wrappedValue: T
    var logger: (Event, T.Value) -> Void
    
    init(wrappedValue: T, logger: @escaping (Event, T.Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    var wrappedValue: T {
        didSet {
            logger(Event.set, wrappedValue)
        }
    }
}

class User {
    @Logged(logger: { (event, value) in
        print("\(event.rawValue) \(value)")
    }) var name: String
    
    @Logged(logger: { (event, value) in
        print("\(event.rawValue) \(value)")
    }) var age: Int
}

let user = User(name: "John", age: 30)
user.name = "Jack"
user.age = 31

enum Event {
    case get, set
}

protocol LoggedProtocol {
    associatedtype Value
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}

@propertyWrapper
struct Logged<Value: LoggedProtocol> {
    var wrappedValue: Value
    
    var logger: (Event, Value.Value) -> Void
    
    init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    func wrappedValue(getter: () -> Value.Value) -> Value.Value {
        logger(Event.get, getter())
        return getter()
    }
    
    func wrappedValue(_ newValue: Value.Value) {
        logger(Event.set, newValue)
        wrappedValue = wrappedValue.init(wrappedValue: newValue, logger: logger)
    }
}

struct LoggedString: LoggedProtocol {
    typealias Value = String
    
    var value: String
    
    init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
        self.value = wrappedValue
        self.logger = logger
    }
    
    func wrappedValue(getter: () -> String) -> String {
        logger(Event.get, getter())
        return getter()
    }
    
    func wrappedValue(_ newValue: String) {
        logger(Event.set, newValue)
        self.value = newValue
    }
}

class LoggedStringWrapper {
    @Logged(logger: { (event, value) in
        print("\(event.rawValue): \(value)")
    })
    var string: LoggedString = "Hello"
}

Value: LoggedProtocol> {
    var wrappedValue: Value
    
    var logger: (Event, Value.Value) -> Void
    
    init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    func wrappedValue(getter: () -> Value.Value) -> Value.Value {
        logger(Event.get, getter())
        return getter()
    }
    
    func wrappedValue(_ newValue: Value.Value) {
        logger(Event.set, newValue)
        wrappedValue = wrappedValue.init(wrappedValue: newValue, logger: logger)
    }
}

struct LoggedString: LoggedProtocol {
    typealias Value = String
    
    var value: String
    
    init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
        self.value = wrappedValue
        self.logger = logger
    }
    
    func wrappedValue(getter: () -> String) -> String {
        logger(Event.get, getter())
        return getter()
    }
    
    func wrappedValue(_ newValue: String) {
        logger(Event.set, newValue)
        self.value = newValue
    }
}

class LoggedStringWrapper {
    @Logged(logger: { (event, value) in
        print("\(event.rawValue): \(value)")
    })
    var string: LoggedString = "Hello"
}

let wrapper = LoggedStringWrapper()
wrapper.string = "World"

enum Event {
    case get, set
}

protocol LoggedProtocol {
    associatedtype Value
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}

@propertyWrapper
struct Logged<T: LoggedProtocol> {
    var wrappedValue: T
    
    var projectedValue: T {
        get {
            wrappedValue.wrappedValue
        }
        set {
            wrappedValue.wrappedValue = newValue
        }
    }
    
    init(wrappedValue: T, logger: @escaping (Event, T.Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.wrappedValue.init(wrappedValue: wrappedValue.wrappedValue, logger: logger)
    }
}

class LoggedClass: Logged<Int> {
    @Logged(logger: { event, value in
        print("\(event): \(value)")
    })
    var value: Int = 0
}

T: LoggedProtocol> {
    var wrappedValue: T
    
    var projectedValue: T {
        get {
            wrappedValue.wrappedValue
        }
        set {
            wrappedValue.wrappedValue = newValue
        }
    }
    
    init(wrappedValue: T, logger: @escaping (Event, T.Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.wrappedValue.init(wrappedValue: wrappedValue.wrappedValue, logger: logger)
    }
}

class LoggedClass: Logged<Int> {
    @Logged(logger: { event, value in
        print("\(event): \(value)")
    })
    var value: Int = 0
}

let loggedClass = LoggedClass()
loggedClass.value = 1
loggedClass.value = 2

enum Event {
    case get, set
}

protocol LoggedProtocol {
    associatedtype Value
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}

@propertyWrapper
struct Logged<T: LoggedProtocol> {
    var wrappedValue: T
    
    var projectedValue: T {
        get {
            wrappedValue.wrappedValue
        }
        set {
            wrappedValue.wrappedValue = newValue
        }
    }
    
    init(wrappedValue: T, logger: @escaping (Event, T.Value) -> Void) {
        self.wrappedValue = wrappedValue(wrappedValue: wrappedValue, logger: logger)
    }
}

class Logger {
    func log(event: Event, value: Any) {
        print("\(event.rawValue) \(value)")
    }
}

struct LoggedInt: LoggedProtocol {
    typealias Value = Int
    
    var wrappedValue: Int
    
    init(wrappedValue: Int, logger: @escaping (Event, Int) -> Void) {
        self.wrappedValue = wrappedValue
        logger(Event.get, wrappedValue)
    }
}

struct LoggedString: LoggedProtocol {
    typealias Value = String
    
    var wrappedValue: String
    
    init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
        self.wrappedValue = wrappedValue
        logger(Event.get, wrappedValue)
    }
}

struct LoggedString2: LoggedProtocol {
    typealias Value = String
    
    var wrappedValue: String
    
    init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
        self.wrappedValue = wrappedValue
        logger(Event.get, wrappedValue)
    }
}

struct LoggedString3: LoggedProtocol {
    typealias Value = String
    
    var wrappedValue: String
    
    init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
        self.wrappedValue = wrappedValue
        logger(Event.get, wrappedValue)
    }
}

struct LoggedString4: LoggedProtocol {
    typealias Value = String
    
    var wrappedValue: String
    
    init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
        self.wrappedValue = wrappedValue
        logger(Event.get, wrappedValue)
    }
}

struct LoggedString5: LoggedProtocol {
    typealias Value = String
    
    var wrappedValue: String
    
    init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
        self.wrappedValue = wrappedValue
        logger(Event.get, wrappedValue)
    }
}

struct LoggedString6: LoggedProtocol {
    typealias Value = String
    
    var wrappedValue: String
    
    init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
        self.wrappedValue = wrappedValue
        logger(Event.get, wrappedValue)
    }
}

struct LoggedString7: LoggedProtocol {
    typealias Value = String
    
    var wrappedValue: String
    
    init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
        self.wrappedValue = wrappedValue
        logger(Event.get, wrappedValue)
    }
}

struct LoggedString8: LoggedProtocol {
    typealias Value = String
    
    var wrappedValue: String
    
    init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
        self.wrappedValue = wrappedValue
        logger(Event.get, wrappedValue)
    }
}

struct LoggedString9: LoggedProtocol {
    typealias Value = String
    
    var wrappedValue: String
    
    init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
        self.wrappedValue = wrappedValue
        logger(Event.get, wrappedValue)
    }
}

T: LoggedProtocol> {
    var wrappedValue: T
    
    var projectedValue: T {
        get {
            wrappedValue.wrappedValue
        }
        set {
            wrappedValue.wrappedValue = newValue
        }
    }
    
    init(wrappedValue: T, logger: @escaping (Event, T.Value) -> Void) {
        self.wrappedValue = wrappedValue(wrappedValue: wrappedValue, logger: logger)
    }
}

class Logger {
    func log(event: Event, value: Any) {
        print("\(event.rawValue) \(value)")
    }
}

struct LoggedInt: LoggedProtocol {
    typealias Value = Int
    
    var wrappedValue: Int
    
    init(wrappedValue: Int, logger: @escaping (Event, Int) -> Void) {
        self.wrappedValue = wrappedValue
        logger(Event.get, wrappedValue)
    }
}

struct LoggedString: LoggedProtocol {
    typealias Value = String
    
    var wrappedValue: String
    
    init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
        self.wrappedValue = wrappedValue
        logger(Event.get, wrappedValue)
    }
}

struct LoggedString2: LoggedProtocol {
    typealias Value = String
    
    var wrappedValue: String
    
    init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
        self.wrappedValue = wrappedValue
        logger(Event.get, wrappedValue)
    }
}

struct LoggedString3: LoggedProtocol {
    typealias Value = String
    
    var wrappedValue: String
    
    init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
        self.wrappedValue = wrappedValue
        logger(Event.get, wrappedValue)
    }
}

struct LoggedString4: LoggedProtocol {
    typealias Value = String
    
    var wrappedValue: String
    
    init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
        self.wrappedValue = wrappedValue
        logger(Event.get, wrappedValue)
    }
}

struct LoggedString5: LoggedProtocol {
    typealias Value = String
    
    var wrappedValue: String
    
    init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
        self.wrappedValue = wrappedValue
        logger(Event.get, wrappedValue)
    }
}

struct LoggedString6: LoggedProtocol {
    typealias Value = String
    
    var wrappedValue: String
    
    init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
        self.wrappedValue = wrappedValue
        logger(Event.get, wrappedValue)
    }
}

struct LoggedString7: LoggedProtocol {
    typealias Value = String
    
    var wrappedValue: String
    
    init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
        self.wrappedValue = wrappedValue
        logger(Event.get, wrappedValue)
    }
}

struct LoggedString8: LoggedProtocol {
    typealias Value = String
    
    var wrappedValue: String
    
    init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
        self.wrappedValue = wrappedValue
        logger(Event.get, wrappedValue)
    }
}

struct LoggedString9: LoggedProtocol {
    typealias Value = String
    
    var wrappedValue: String
    
    init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
        self.wrappedValue = wrappedValue
        logger(Event.get, wrappedValue)
    }
}

struct LoggedString10: LoggedProtocol {
    typealias Value = String
    
    var wrappedValue: String
    
    init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
        self.wrappedValue = wrappedValue
        logger(Event.get

enum Event {
    case get, set
}

protocol LoggedProtocol {
    associatedtype Value
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}

@propertyWrapper
struct Logged<T: LoggedProtocol> {
    var wrappedValue: T
    var logger: (Event, T.Value) -> Void
    
    init(wrappedValue: T, logger: @escaping (Event, T.Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    var wrappedValue: T {
        didSet {
            logger(Event.set, wrappedValue)
        }
    }
}

T: LoggedProtocol> {
    var wrappedValue: T
    var logger: (Event, T.Value) -> Void
    
    init(wrappedValue: T, logger: @escaping (Event, T.Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    var wrappedValue: T {
        didSet {
            logger(Event.set, wrappedValue)
        }
    }
}

enum Event {
    case get, set
}

protocol LoggedProtocol {
    associatedtype Value
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}

@propertyWrapper
struct Logged<Value: LoggedProtocol> {
    var wrappedValue: Value
    var logger: (Event, Value) -> Void

    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }

    func wrappedValue(getter: () -> Value, setter: (Value) -> Void) -> Value {
        let value = getter()
        logger(Event.get, value)
        return value
    }

    var wrappedValue: Value {
        get {
            return wrappedValue(getter: {
                self.wrappedValue.wrappedValue
            })
        }
        set {
            wrappedValue(getter: {
                self.wrappedValue.wrappedValue
            }, setter: { newValue in
                self.wrappedValue.wrappedValue = newValue
                logger(Event.set, newValue)
            })
        }
    }
}

class LoggedClass {
    @Logged(logger: { (event, value) in
        print("\(event): \(value)")
    }) var value: Int = 0
}

Value: LoggedProtocol> {
    var wrappedValue: Value
    var logger: (Event, Value) -> Void

    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }

    func wrappedValue(getter: () -> Value, setter: (Value) -> Void) -> Value {
        let value = getter()
        logger(Event.get, value)
        return value
    }

    var wrappedValue: Value {
        get {
            return wrappedValue(getter: {
                self.wrappedValue.wrappedValue
            })
        }
        set {
            wrappedValue(getter: {
                self.wrappedValue.wrappedValue
            }, setter: { newValue in
                self.wrappedValue.wrappedValue = newValue
                logger(Event.set, newValue)
            })
        }
    }
}

class LoggedClass {
    @Logged(logger: { (event, value) in
        print("\(event): \(value)")
    }) var value: Int = 0
}

let loggedClass = LoggedClass()
loggedClass.value = 1
loggedClass.value = 2
loggedClass.value

enum Event {
    case get, set
}

protocol LoggedProtocol {
    associatedtype Value
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}

@propertyWrapper
struct Logged<Value: LoggedProtocol> {
    var wrappedValue: Value
    
    init(wrappedValue: Value) {
        self.wrappedValue = wrappedValue
    }
    
    var projectedValue: Value {
        get {
            wrappedValue.log(Event.get, wrappedValue)
            return wrappedValue
        }
        set {
            wrappedValue.log(Event.set, newValue)
            wrappedValue = newValue
        }
    }
}

class Logger<Value> {
    init(logger: @escaping (Event, Value) -> Void) {
        self.logger = logger
    }
    
    func log(_ event: Event, _ value: Value) {
        logger(event, value)
    }
    
    private let logger: (Event, Value) -> Void
}

class User {
    @Logged(logger: Logger(logger: { (event, value) in
        print("\(event.rawValue) \(value)")
    })) var name: String
}

Value: LoggedProtocol> {
    var wrappedValue: Value
    
    init(wrappedValue: Value) {
        self.wrappedValue = wrappedValue
    }
    
    var projectedValue: Value {
        get {
            wrappedValue.log(Event.get, wrappedValue)
            return wrappedValue
        }
        set {
            wrappedValue.log(Event.set, newValue)
            wrappedValue = newValue
        }
    }
}

class Logger<Value> {
    init(logger: @escaping (Event, Value) -> Void) {
        self.logger = logger
    }
    
    func log(_ event: Event, _ value: Value) {
        logger(event, value)
    }
    
    private let logger: (Event, Value) -> Void
}

class User {
    @Logged(logger: Logger(logger: { (event, value) in
        print("\(event.rawValue) \(value)")
    })) var name: String
}

let user = User()
user.name = "John"

enum Event {
    case get, set
}

protocol LoggedProtocol {
    associatedtype Value
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}

@propertyWrapper
struct Logged<Value: LoggedProtocol> {
    var wrappedValue: Value
    
    var logger: (Event, Value.Value) -> Void
    
    init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    func log(event: Event) {
        logger(event, wrappedValue.wrappedValue)
    }
    
    var wrappedValue: Value {
        get {
            log(event: .get)
            return wrappedValue.wrappedValue
        }
        set {
            log(event: .set)
            wrappedValue.wrappedValue = newValue
        }
    }
}

struct Person {
    @Logged(logger: { (event, value) in
        print("\(event.rawValue) \(value)")
    })
    var name: String
}

Value: LoggedProtocol> {
    var wrappedValue: Value
    
    var logger: (Event, Value.Value) -> Void
    
    init(wrappedValue: Value, logger: @escaping (Event, Value.Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    func log(event: Event) {
        logger(event, wrappedValue.wrappedValue)
    }
    
    var wrappedValue: Value {
        get {
            log(event: .get)
            return wrappedValue.wrappedValue
        }
        set {
            log(event: .set)
            wrappedValue.wrappedValue = newValue
        }
    }
}

struct Person {
    @Logged(logger: { (event, value) in
        print("\(event.rawValue) \(value)")
    })
    var name: String
}

let person = Person(name: "John")
person.name = "Johnny"

enum Event {
    case get, set
}

protocol LoggedProtocol {
    associatedtype Value
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}

@propertyWrapper
struct Logged<Value: LoggedProtocol> {
    var wrappedValue: Value
    
    var logger: (Event, Value) -> Void
    
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    var wrappedValue: Value {
        get {
            logger(Event.get, wrappedValue)
            return wrappedValue
        }
        set {
            logger(Event.set, newValue)
            wrappedValue = newValue
        }
    }
}

struct LoggedStruct: LoggedProtocol {
    typealias Value = Int
    
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    var wrappedValue: Value {
        get {
            logger(Event.get, wrappedValue)
            return wrappedValue
        }
        set {
            logger(Event.set, newValue)
            wrappedValue = newValue
        }
    }
}

struct LoggedClass: LoggedProtocol {
    typealias Value = Int
    
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    var wrappedValue: Value {
        get {
            logger(Event.get, wrappedValue)
            return wrappedValue
        }
        set {
            logger(Event.set, newValue)
            wrappedValue = newValue
        }
    }
}

struct LoggedStruct2: LoggedProtocol {
    typealias Value = Int
    
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    var wrappedValue: Value {
        get {
            logger(Event.get, wrappedValue)
            return wrappedValue
        }
        set {
            logger(Event.set, newValue)
            wrappedValue = newValue
        }
    }
}

struct LoggedClass2: LoggedProtocol {
    typealias Value = Int
    
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    var wrappedValue: Value {
        get {
            logger(Event.get, wrappedValue)
            return wrappedValue
        }
        set {
            logger(Event.set, newValue)
            wrappedValue = newValue
        }
    }
}

class LoggedClass3: LoggedProtocol {
    typealias Value = Int
    
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    var wrappedValue: Value {
        get {
            logger(Event.get, wrappedValue)
            return wrappedValue
        }
        set {
            logger(Event.set, newValue)
            wrappedValue = newValue
        }
    }
}

struct LoggedStruct3: LoggedProtocol {
    typealias Value = Int
    
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    var wrappedValue: Value {
        get {
            logger(Event.get, wrappedValue)
            return wrappedValue
        }
        set {
            logger(Event.set, newValue)
            wrappedValue = newValue
        }
    }
}

Value: LoggedProtocol> {
    var wrappedValue: Value
    
    var logger: (Event, Value) -> Void
    
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    var wrappedValue: Value {
        get {
            logger(Event.get, wrappedValue)
            return wrappedValue
        }
        set {
            logger(Event.set, newValue)
            wrappedValue = newValue
        }
    }
}

struct LoggedStruct: LoggedProtocol {
    typealias Value = Int
    
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    var wrappedValue: Value {
        get {
            logger(Event.get, wrappedValue)
            return wrappedValue
        }
        set {
            logger(Event.set, newValue)
            wrappedValue = newValue
        }
    }
}

struct LoggedClass: LoggedProtocol {
    typealias Value = Int
    
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    var wrappedValue: Value {
        get {
            logger(Event.get, wrappedValue)
            return wrappedValue
        }
        set {
            logger(Event.set, newValue)
            wrappedValue = newValue
        }
    }
}

struct LoggedStruct2: LoggedProtocol {
    typealias Value = Int
    
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    var wrappedValue: Value {
        get {
            logger(Event.get, wrappedValue)
            return wrappedValue
        }
        set {
            logger(Event.set, newValue)
            wrappedValue = newValue
        }
    }
}

struct LoggedClass2: LoggedProtocol {
    typealias Value = Int
    
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    var wrappedValue: Value {
        get {
            logger(Event.get, wrappedValue)
            return wrappedValue
        }
        set {
            logger(Event.set, newValue)
            wrappedValue = newValue
        }
    }
}

class LoggedClass3: LoggedProtocol {
    typealias Value = Int
    
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    var wrappedValue: Value {
        get {
            logger(Event.get, wrappedValue)
            return wrappedValue
        }
        set {
            logger(Event.set, newValue)
            wrappedValue = newValue
        }
    }
}

struct LoggedStruct3: LoggedProtocol {
    typealias Value = Int
    
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    var wrappedValue: Value {
        get {
            logger(Event.get, wrappedValue)
            return wrappedValue
        }
        set {
            logger(Event.set, newValue)
            wrappedValue = newValue
        }
    }
}

struct LoggedClass4: LoggedProtocol {
    typealias Value = Int
    
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
        self.wrappedValue = wrappedValue
        self.logger = logger
    }
    
    var wrappedValue: Value {
        get {
            logger(Event.get, wrappedValue)
            return wrappedValue
        }
        set {
            logger(Event.set, newValue)

enum Event {
    case get, set
}

protocol LoggedProtocol {
    associatedtype Value
    init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}

@propertyWrapper
struct Logged<T: LoggedProtocol> {
    var wrappedValue: T
    
    var projectedValue: T {
        get {
            wrappedValue.wrappedValue
        }
        set {
            wrappedValue.wrappedValue = newValue
        }
    }
    
    init(wrappedValue: T, logger: @escaping (Event, T.Value) -> Void) {
        self.wrappedValue = wrappedValue(wrappedValue: wrappedValue, logger: logger)
    }
}

class Logger {
    func log(event: Event, value: Any) {
        print("\(event.rawValue) \(value)")
    }
}

class Person {
    @Logged(logger: Logger.log) var name: String
    @Logged(logger: Logger.log) var age: Int
}

T: LoggedProtocol> {
    var wrappedValue: T
    
    var projectedValue: T {
        get {
            wrappedValue.wrappedValue
        }
        set {
            wrappedValue.wrappedValue = newValue
        }
    }
    
    init(wrappedValue: T, logger: @escaping (Event, T.Value) -> Void) {
        self.wrappedValue = wrappedValue(wrappedValue: wrappedValue, logger: logger)
    }
}

class Logger {
    func log(event: Event, value: Any) {
        print("\(event.rawValue) \(value)")
    }
}

class Person {
    @Logged(logger: Logger.log) var name: String
    @Logged(logger: Logger.log) var age: Int
}

let person = Person(name: "John", age: 30)
person.name = "Jane"
person.age = 31

protocol WeatherProvider {
    func forecast(for city: String) throws -> String
}

enum UserAction {
    case keyboardCharacterSelect(Character)
    case keyboardDeleteBackwards
    case searchButtonPress
}

enum ApplicationFeedback: Equatable {
    case success(city: String, forecast: String)
    case failure(city: String)
}

protocol WeatherApplicationDependencies {
    init(provider: WeatherProvider)
}

protocol WeatherApplicationInteractions {
    func handle(action: UserAction) -> ApplicationFeedback?
}

typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions

class WeatherApplication: WeatherApplicationProtocol {
    private let provider: WeatherProvider
    
    init(provider: WeatherProvider) {
        self.provider = provider
    }
    
    func handle(action: UserAction) -> ApplicationFeedback? {
        switch action {
        case .keyboardCharacterSelect(let character):
            return nil
        case .keyboardDeleteBackwards:
            return nil
        case .searchButtonPress:
            return nil
        }
    }
    
    func forecast(for city: String) throws -> String {
        return try provider.forecast(for: city)
    }
}

 {
    private let provider: WeatherProvider
    
    init(provider: WeatherProvider) {
        self.provider = provider
    }
    
    func handle(action: UserAction) -> ApplicationFeedback? {
        switch action {
        case .keyboardCharacterSelect(let character):
            return nil
        case .keyboardDeleteBackwards:
            return nil
        case .searchButtonPress:
            return nil
        }
    }
    
    func forecast(for city: String) throws -> String {
        return try provider.forecast(for: city)
    }
}

protocol WeatherProvider {
    func forecast(for city: String) throws -> String
}

enum UserAction {
    case keyboardCharacterSelect(Character)
    case keyboardDeleteBackwards
    case searchButtonPress
}

enum ApplicationFeedback: Equatable {
    case success(city: String, forecast: String)
    case failure(city: String)
}

protocol WeatherApplicationDependencies {
    init(provider: WeatherProvider)
}

protocol WeatherApplicationInteractions {
    func handle(action: UserAction) -> ApplicationFeedback?
}

typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions

class WeatherApplication: WeatherApplicationProtocol {
    private let provider: WeatherProvider
    
    init(provider: WeatherProvider) {
        self.provider = provider
    }
    
    func handle(action: UserAction) -> ApplicationFeedback? {
        switch action {
        case .keyboardCharacterSelect(let character):
            return nil
        case .keyboardDeleteBackwards:
            return nil
        case .searchButtonPress:
            return nil
        }
    }
    
    func forecast(for city: String) throws -> String {
        return try provider.forecast(for: city)
    }
}

 {
    private let provider: WeatherProvider
    
    init(provider: WeatherProvider) {
        self.provider = provider
    }
    
    func handle(action: UserAction) -> ApplicationFeedback? {
        switch action {
        case .keyboardCharacterSelect(let character):
            return nil
        case .keyboardDeleteBackwards:
            return nil
        case .searchButtonPress:
            return nil
        }
    }
    
    func forecast(for city: String) throws -> String {
        return try provider.forecast(for: city)
    }
}

protocol WeatherProvider {
    func forecast(for city: String) throws -> String
}

enum UserAction {
    case keyboardCharacterSelect(Character)
    case keyboardDeleteBackwards
    case searchButtonPress
}

enum ApplicationFeedback: Equatable {
    case success(city: String, forecast: String)
    case failure(city: String)
}

protocol WeatherApplicationDependencies {
    init(provider: WeatherProvider)
}

protocol WeatherApplicationInteractions {
    func handle(action: UserAction) -> ApplicationFeedback?
}

typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions

class WeatherApplication: WeatherApplicationProtocol {
    private let provider: WeatherProvider
    
    init(provider: WeatherProvider) {
        self.provider = provider
    }
    
    func handle(action: UserAction) -> ApplicationFeedback? {
        switch action {
        case .keyboardCharacterSelect(let character):
            return nil
        case .keyboardDeleteBackwards:
            return nil
        case .searchButtonPress:
            return nil
        }
    }
}

 {
    private let provider: WeatherProvider
    
    init(provider: WeatherProvider) {
        self.provider = provider
    }
    
    func handle(action: UserAction) -> ApplicationFeedback? {
        switch action {
        case .keyboardCharacterSelect(let character):
            return nil
        case .keyboardDeleteBackwards:
            return nil
        case .searchButtonPress:
            return nil
        }
    }
}

protocol WeatherProvider {
    func forecast(for city: String) throws -> String
}

enum UserAction {
    case keyboardCharacterSelect(Character)
    case keyboardDeleteBackwards
    case searchButtonPress
}

enum ApplicationFeedback: Equatable {
    case success(city: String, forecast: String)
    case failure(city: String)
}

protocol WeatherApplicationDependencies {
    init(provider: WeatherProvider)
}

protocol WeatherApplicationInteractions {
    func handle(action: UserAction) -> ApplicationFeedback?
}

typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions

class WeatherApplication: WeatherApplicationProtocol {
    private let provider: WeatherProvider
    
    init(provider: WeatherProvider) {
        self.provider = provider
    }
    
    func handle(action: UserAction) -> ApplicationFeedback? {
        switch action {
        case .keyboardCharacterSelect(let character):
            return nil
        case .keyboardDeleteBackwards:
            return nil
        case .searchButtonPress:
            return nil
        }
    }
}

 {
    private let provider: WeatherProvider
    
    init(provider: WeatherProvider) {
        self.provider = provider
    }
    
    func handle(action: UserAction) -> ApplicationFeedback? {
        switch action {
        case .keyboardCharacterSelect(let character):
            return nil
        case .keyboardDeleteBackwards:
            return nil
        case .searchButtonPress:
            return nil
        }
    }
}

protocol WeatherProvider {
    func forecast(for city: String) throws -> String
}

enum UserAction {
    case keyboardCharacterSelect(Character)
    case keyboardDeleteBackwards
    case searchButtonPress
}

enum ApplicationFeedback: Equatable {
    case success(city: String, forecast: String)
    case failure(city: String)
}

protocol WeatherApplicationDependencies {
    init(provider: WeatherProvider)
}

protocol WeatherApplicationInteractions {
    func handle(action: UserAction) -> ApplicationFeedback?
}

typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions

class WeatherApplication: WeatherApplicationProtocol {
    private var provider: WeatherProvider
    private var currentCity: String = ""
    private var currentForecast: String = ""

    required init(provider: WeatherProvider) {
        self.provider = provider
    }

    func handle(action: UserAction) -> ApplicationFeedback? {
        switch action {
        case .keyboardCharacterSelect(let character):
            currentCity += character
        case .keyboardDeleteBackwards:
            currentCity.removeLast()
        case .searchButtonPress:
            do {
                currentForecast = try provider.forecast(for: currentCity)
                return .success(city: currentCity, forecast: currentForecast)
            } catch {
                return .failure(city: currentCity)
            }
        }
        return nil
    }
}

 {
    private var provider: WeatherProvider
    private var currentCity: String = ""
    private var currentForecast: String = ""

    required init(provider: WeatherProvider) {
        self.provider = provider
    }

    func handle(action: UserAction) -> ApplicationFeedback? {
        switch action {
        case .keyboardCharacterSelect(let character):
            currentCity += character
        case .keyboardDeleteBackwards:
            currentCity.removeLast()
        case .searchButtonPress:
            do {
                currentForecast = try provider.forecast(for: currentCity)
                return .success(city: currentCity, forecast: currentForecast)
            } catch {
                return .failure(city: currentCity)
            }
        }
        return nil
    }
}

protocol WeatherProvider {
    func forecast(for city: String) throws -> String
}

enum UserAction {
    case keyboardCharacterSelect(Character)
    case keyboardDeleteBackwards
    case searchButtonPress
}

enum ApplicationFeedback: Equatable {
    case success(city: String, forecast: String)
    case failure(city: String)
}

protocol WeatherApplicationDependencies {
    init(provider: WeatherProvider)
}

protocol WeatherApplicationInteractions {
    func handle(action: UserAction) -> ApplicationFeedback?
}

typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions

class WeatherApplication: WeatherApplicationProtocol {
    private var provider: WeatherProvider
    
    init(provider: WeatherProvider) {
        self.provider = provider
    }
    
    func handle(action: UserAction) -> ApplicationFeedback? {
        switch action {
        case .keyboardCharacterSelect(let character):
            return nil
        case .keyboardDeleteBackwards:
            return nil
        case .searchButtonPress:
            return nil
        }
    }
    
    func forecast(for city: String) throws -> String {
        return try provider.forecast(for: city)
    }
}

 {
    private var provider: WeatherProvider
    
    init(provider: WeatherProvider) {
        self.provider = provider
    }
    
    func handle(action: UserAction) -> ApplicationFeedback? {
        switch action {
        case .keyboardCharacterSelect(let character):
            return nil
        case .keyboardDeleteBackwards:
            return nil
        case .searchButtonPress:
            return nil
        }
    }
    
    func forecast(for city: String) throws -> String {
        return try provider.forecast(for: city)
    }
}

protocol WeatherProvider {
    func forecast(for city: String) throws -> String
}

enum UserAction {
    case keyboardCharacterSelect(Character)
    case keyboardDeleteBackwards
    case searchButtonPress
}

enum ApplicationFeedback: Equatable {
    case success(city: String, forecast: String)
    case failure(city: String)
}

protocol WeatherApplicationDependencies {
    init(provider: WeatherProvider)
}

protocol WeatherApplicationInteractions {
    func handle(action: UserAction) -> ApplicationFeedback?
}

typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions

class WeatherApplication: WeatherApplicationProtocol {
    private let provider: WeatherProvider
    
    init(provider: WeatherProvider) {
        self.provider = provider
    }
    
    func handle(action: UserAction) -> ApplicationFeedback? {
        switch action {
        case .keyboardCharacterSelect(let character):
            return nil
        case .keyboardDeleteBackwards:
            return nil
        case .searchButtonPress:
            return nil
        }
    }
    
    func forecast(for city: String) throws -> String {
        return try provider.forecast(for: city)
    }
}

 {
    private let provider: WeatherProvider
    
    init(provider: WeatherProvider) {
        self.provider = provider
    }
    
    func handle(action: UserAction) -> ApplicationFeedback? {
        switch action {
        case .keyboardCharacterSelect(let character):
            return nil
        case .keyboardDeleteBackwards:
            return nil
        case .searchButtonPress:
            return nil
        }
    }
    
    func forecast(for city: String) throws -> String {
        return try provider.forecast(for: city)
    }
}

protocol WeatherProvider {
    func forecast(for city: String) throws -> String
}

enum UserAction {
    case keyboardCharacterSelect(Character)
    case keyboardDeleteBackwards
    case searchButtonPress
}

enum ApplicationFeedback: Equatable {
    case success(city: String, forecast: String)
    case failure(city: String)
}

protocol WeatherApplicationDependencies {
    init(provider: WeatherProvider)
}

protocol WeatherApplicationInteractions {
    func handle(action: UserAction) -> ApplicationFeedback?
}

typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions

class WeatherApplication: WeatherApplicationProtocol {
    private let provider: WeatherProvider
    
    init(provider: WeatherProvider) {
        self.provider = provider
    }
    
    func handle(action: UserAction) -> ApplicationFeedback? {
        switch action {
        case .keyboardCharacterSelect(let character):
            return nil
        case .keyboardDeleteBackwards:
            return nil
        case .searchButtonPress:
            return nil
        }
    }
    
    func forecast(for city: String) throws -> String {
        return try provider.forecast(for: city)
    }
}

 {
    private let provider: WeatherProvider
    
    init(provider: WeatherProvider) {
        self.provider = provider
    }
    
    func handle(action: UserAction) -> ApplicationFeedback? {
        switch action {
        case .keyboardCharacterSelect(let character):
            return nil
        case .keyboardDeleteBackwards:
            return nil
        case .searchButtonPress:
            return nil
        }
    }
    
    func forecast(for city: String) throws -> String {
        return try provider.forecast(for: city)
    }
}

protocol WeatherProvider {
    func forecast(for city: String) throws -> String
}

enum UserAction {
    case keyboardCharacterSelect(Character)
    case keyboardDeleteBackwards
    case searchButtonPress
}

enum ApplicationFeedback: Equatable {
    case success(city: String, forecast: String)
    case failure(city: String)
}

protocol WeatherApplicationDependencies {
    init(provider: WeatherProvider)
}

protocol WeatherApplicationInteractions {
    func handle(action: UserAction) -> ApplicationFeedback?
}

typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions

class WeatherApplication: WeatherApplicationProtocol {
    private let provider: WeatherProvider
    private var currentCity: String? = nil
    private var currentForecast: String? = nil

    init(provider: WeatherProvider) {
        self.provider = provider
    }

    func handle(action: UserAction) -> ApplicationFeedback? {
        switch action {
        case .keyboardCharacterSelect(let character):
            return handleKeyboardCharacterSelect(character)
        case .keyboardDeleteBackwards:
            return handleKeyboardDeleteBackwards()
        case .searchButtonPress:
            return handleSearchButtonPress()
        }
    }

    private func handleKeyboardCharacterSelect(_ character: Character) -> ApplicationFeedback? {
        if let city = currentCity,
            let forecast = currentForecast,
            city.count < 5,
            forecast.count < 5 {
            currentCity = city + String(character)
            return nil
        } else {
            return .failure(city: currentCity ?? "")
        }
    }

    private func handleKeyboardDeleteBackwards() -> ApplicationFeedback? {
        if let city = currentCity,
            let forecast = currentForecast,
            city.count > 1,
            forecast.count > 1 {
            currentCity = city.dropLast()
            return nil
        } else {
            return .failure(city: currentCity ?? "")
        }
    }

    private func handleSearchButtonPress() -> ApplicationFeedback? {
        if let city = currentCity,
            let forecast = currentForecast {
            currentCity = nil
            currentForecast = nil
            return .success(city: city, forecast: forecast)
        } else {
            return .failure(city: currentCity ?? "")
        }
    }

    func forecast(for city: String) throws -> String {
        return try provider.forecast(for: city)
    }
}

 {
    private let provider: WeatherProvider
    private var currentCity: String? = nil
    private var currentForecast: String? = nil

    init(provider: WeatherProvider) {
        self.provider = provider
    }

    func handle(action: UserAction) -> ApplicationFeedback? {
        switch action {
        case .keyboardCharacterSelect(let character):
            return handleKeyboardCharacterSelect(character)
        case .keyboardDeleteBackwards:
            return handleKeyboardDeleteBackwards()
        case .searchButtonPress:
            return handleSearchButtonPress()
        }
    }

    private func handleKeyboardCharacterSelect(_ character: Character) -> ApplicationFeedback? {
        if let city = currentCity,
            let forecast = currentForecast,
            city.count < 5,
            forecast.count < 5 {
            currentCity = city + String(character)
            return nil
        } else {
            return .failure(city: currentCity ?? "")
        }
    }

    private func handleKeyboardDeleteBackwards() -> ApplicationFeedback? {
        if let city = currentCity,
            let forecast = currentForecast,
            city.count > 1,
            forecast.count > 1 {
            currentCity = city.dropLast()
            return nil
        } else {
            return .failure(city: currentCity ?? "")
        }
    }

    private func handleSearchButtonPress() -> ApplicationFeedback? {
        if let city = currentCity,
            let forecast = currentForecast {
            currentCity = nil
            currentForecast = nil
            return .success(city: city, forecast: forecast)
        } else {
            return .failure(city: currentCity ?? "")
        }
    }

    func forecast(for city: String) throws -> String {
        return try provider.forecast(for: city)
    }
}

protocol WeatherProvider {
    func forecast(for city: String) throws -> String
}

enum UserAction {
    case keyboardCharacterSelect(Character)
    case keyboardDeleteBackwards
    case searchButtonPress
}

enum ApplicationFeedback: Equatable {
    case success(city: String, forecast: String)
    case failure(city: String)
}

protocol WeatherApplicationDependencies {
    init(provider: WeatherProvider)
}

protocol WeatherApplicationInteractions {
    func handle(action: UserAction) -> ApplicationFeedback?
}

typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions

class WeatherApplication: WeatherApplicationProtocol {
    private var provider: WeatherProvider
    private var currentCity: String = ""
    private var currentForecast: String = ""

    init(provider: WeatherProvider) {
        self.provider = provider
    }

    func handle(action: UserAction) -> ApplicationFeedback? {
        switch action {
        case .keyboardCharacterSelect(let character):
            currentCity += String(character)
        case .keyboardDeleteBackwards:
            currentCity = currentCity.dropLast(1)
        case .searchButtonPress:
            do {
                currentForecast = try provider.forecast(for: currentCity)
                return .success(city: currentCity, forecast: currentForecast)
            } catch {
                return .failure(city: currentCity)
            }
        }
        return nil
    }
}

 {
    private var provider: WeatherProvider
    private var currentCity: String = ""
    private var currentForecast: String = ""

    init(provider: WeatherProvider) {
        self.provider = provider
    }

    func handle(action: UserAction) -> ApplicationFeedback? {
        switch action {
        case .keyboardCharacterSelect(let character):
            currentCity += String(character)
        case .keyboardDeleteBackwards:
            currentCity = currentCity.dropLast(1)
        case .searchButtonPress:
            do {
                currentForecast = try provider.forecast(for: currentCity)
                return .success(city: currentCity, forecast: currentForecast)
            } catch {
                return .failure(city: currentCity)
            }
        }
        return nil
    }
}

protocol BankAccountProtocol {
    init(balance: Double)
    var balance: Double { get async }
    func deposit(amount: Double) async
    func withdraw(amount: Double) async -> Bool
}

actor BankAccount: BankAccountProtocol {
    var balance: Double {
        get {
            try await balancePromise
        }
    }
    
    var balancePromise: Future<Double, Error>
    
    init(balance: Double) {
        self.balancePromise = Future<Double, Error> {
            try await balancePromise
            return balance
        }
    }
    
    func deposit(amount: Double) async {
        try await balancePromise
        balance += amount
        balancePromise = Future<Double, Error> {
            try await balancePromise
            return balance
        }
    }
    
    func withdraw(amount: Double) async -> Bool {
        try await balancePromise
        if balance < amount {
            return false
        }
        balance -= amount
        balancePromise = Future<Double, Error> {
            try await balancePromise
            return balance
        }
        return true
    }
}

    var balance: Double {
        get {
            try await balancePromise
        }
    }
    
    var balancePromise: Future<Double, Error>
    
    init(balance: Double) {
        self.balancePromise = Future<Double, Error> {
            try await balancePromise
            return balance
        }
    }
    
    func deposit(amount: Double) async {
        try await balancePromise
        balance += amount
        balancePromise = Future<Double, Error> {
            try await balancePromise
            return balance
        }
    }
    
    func withdraw(amount: Double) async -> Bool {
        try await balancePromise
        if balance < amount {
            return false
        }
        balance -= amount
        balancePromise = Future<Double, Error> {
            try await balancePromise
            return balance
        }
        return true
    }
}

protocol BankAccountProtocol {
    init(balance: Double)
    var balance: Double { get async }
    func deposit(amount: Double) async
    func withdraw(amount: Double) async -> Bool
}

actor BankAccount: BankAccountProtocol {
    var balance: Double {
        get {
            try await balancePromise
        }
    }
    var balancePromise: Future<Double, Error>
    init(balance: Double) {
        self.balancePromise = Future<Double, Error> {
            fulfill in
            balancePromise = fulfill(balance)
        }
    }
    func deposit(amount: Double) async {
        try await balancePromise
        balancePromise = balancePromise.then {
            balance in
            fulfill in
            balancePromise = fulfill(balance + amount)
        }
    }
    func withdraw(amount: Double) async -> Bool {
        try await balancePromise
        balancePromise = balancePromise.then {
            balance in
            fulfill in
            balancePromise = fulfill(balance - amount)
        }
        return balancePromise.result.value >= 0
    }
}

    var balance: Double {
        get {
            try await balancePromise
        }
    }
    var balancePromise: Future<Double, Error>
    init(balance: Double) {
        self.balancePromise = Future<Double, Error> {
            fulfill in
            balancePromise = fulfill(balance)
        }
    }
    func deposit(amount: Double) async {
        try await balancePromise
        balancePromise = balancePromise.then {
            balance in
            fulfill in
            balancePromise = fulfill(balance + amount)
        }
    }
    func withdraw(amount: Double) async -> Bool {
        try await balancePromise
        balancePromise = balancePromise.then {
            balance in
            fulfill in
            balancePromise = fulfill(balance - amount)
        }
        return balancePromise.result.value >= 0
    }
}

protocol BankAccountProtocol {
    init(balance: Double)
    var balance: Double { get async }
    func deposit(amount: Double) async
    func withdraw(amount: Double) async -> Bool
}

actor BankAccount: BankAccountProtocol {
    var balance: Double {
        get {
            try await balancePromise
        }
    }
    
    func deposit(amount: Double) async {
        balancePromise = self.balance + amount
    }
    
    func withdraw(amount: Double) async -> Bool {
        if self.balance < amount {
            return false
        }
        balancePromise = self.balance - amount
        return true
    }
    
    private var balancePromise: Double = 0
}

    var balance: Double {
        get {
            try await balancePromise
        }
    }
    
    func deposit(amount: Double) async {
        balancePromise = self.balance + amount
    }
    
    func withdraw(amount: Double) async -> Bool {
        if self.balance < amount {
            return false
        }
        balancePromise = self.balance - amount
        return true
    }
    
    private var balancePromise: Double = 0
}

protocol BankAccountProtocol {
    init(balance: Double)
    var balance: Double { get async }
    func deposit(amount: Double) async
    func withdraw(amount: Double) async -> Bool
}

actor BankAccount: BankAccountProtocol {
    var balance: Double {
        get {
            try await balancePromise
        }
    }
    
    var balancePromise: Future<Double, Error>
    
    init(balance: Double) {
        self.balancePromise = Future {
            try await Task.sleep(nanoseconds: UInt64(balance * 1_000_000_000))
            return balance
        }
    }
    
    func deposit(amount: Double) async {
        try await balancePromise
        balancePromise = Future {
            try await Task.sleep(nanoseconds: UInt64(amount * 1_000_000_000))
            return balance + amount
        }
    }
    
    func withdraw(amount: Double) async -> Bool {
        try await balancePromise
        balancePromise = Future {
            try await Task.sleep(nanoseconds: UInt64(amount * 1_000_000_000))
            return balance >= amount
        }
    }
}

    var balance: Double {
        get {
            try await balancePromise
        }
    }
    
    var balancePromise: Future<Double, Error>
    
    init(balance: Double) {
        self.balancePromise = Future {
            try await Task.sleep(nanoseconds: UInt64(balance * 1_000_000_000))
            return balance
        }
    }
    
    func deposit(amount: Double) async {
        try await balancePromise
        balancePromise = Future {
            try await Task.sleep(nanoseconds: UInt64(amount * 1_000_000_000))
            return balance + amount
        }
    }
    
    func withdraw(amount: Double) async -> Bool {
        try await balancePromise
        balancePromise = Future {
            try await Task.sleep(nanoseconds: UInt64(amount * 1_000_000_000))
            return balance >= amount
        }
    }
}

protocol BankAccountProtocol {
    init(balance: Double)
    var balance: Double { get async }
    func deposit(amount: Double) async
    func withdraw(amount: Double) async -> Bool
}

actor BankAccount: BankAccountProtocol {
    var balance: Double {
        get {
            self.balanceActor.get()
        }
    }
    func deposit(amount: Double) async {
        self.balanceActor.send(amount)
    }
    func withdraw(amount: Double) async -> Bool {
        return try await self.balanceActor.send(amount)
    }
    init(balance: Double) {
        self.balanceActor = BalanceActor(balance: balance)
    }
    private let balanceActor = BalanceActor()
}

class BalanceActor {
    var balance: Double = 0
    func get() async {
        await self.balancePromise
    }
    func send(amount: Double) async throws -> Bool {
        guard amount > 0 else {
            throw Error.invalidAmount
        }
        self.balance += amount
        self.balancePromise = Task.promise {
            await self.balancePromise
            self.balance -= amount
            return true
        }
        return false
    }
    init(balance: Double) {
        self.balance = balance
    }
    private var balancePromise: Task<Bool>? = nil
}

enum Error: Swift.Error {
    case invalidAmount
}

    var balance: Double {
        get {
            self.balanceActor.get()
        }
    }
    func deposit(amount: Double) async {
        self.balanceActor.send(amount)
    }
    func withdraw(amount: Double) async -> Bool {
        return try await self.balanceActor.send(amount)
    }
    init(balance: Double) {
        self.balanceActor = BalanceActor(balance: balance)
    }
    private let balanceActor = BalanceActor()
}

class BalanceActor {
    var balance: Double = 0
    func get() async {
        await self.balancePromise
    }
    func send(amount: Double) async throws -> Bool {
        guard amount > 0 else {
            throw Error.invalidAmount
        }
        self.balance += amount
        self.balancePromise = Task.promise {
            await self.balancePromise
            self.balance -= amount
            return true
        }
        return false
    }
    init(balance: Double) {
        self.balance = balance
    }
    private var balancePromise: Task<Bool>? = nil
}

enum Error: Swift.Error {
    case invalidAmount
}

protocol BankAccountProtocol {
    init(balance: Double)
    var balance: Double { get async }
    func deposit(amount: Double) async
    func withdraw(amount: Double) async -> Bool
}

actor BankAccount: BankAccountProtocol {
    var balance: Double {
        get {
            try await balancePromise
        }
    }
    
    private let balancePromise: Future<Double, Error>
    
    init(balance: Double) {
        self.balancePromise = Future<Double, Error> {
            try await Task.sleep(nanoseconds: UInt64(balance * 1_000_000_000))
            return balance
        }
    }
    
    func deposit(amount: Double) async {
        try await balancePromise
        balancePromise = Future<Double, Error> {
            try await Task.sleep(nanoseconds: UInt64(amount * 1_000_000_000))
            return balance + amount
        }
    }
    
    func withdraw(amount: Double) async -> Bool {
        try await balancePromise
        if balance >= amount {
            balancePromise = Future<Double, Error> {
                try await Task.sleep(nanoseconds: UInt64(amount * 1_000_000_000))
                return balance - amount
            }
            return true
        }
        return false
    }
}

    var balance: Double {
        get {
            try await balancePromise
        }
    }
    
    private let balancePromise: Future<Double, Error>
    
    init(balance: Double) {
        self.balancePromise = Future<Double, Error> {
            try await Task.sleep(nanoseconds: UInt64(balance * 1_000_000_000))
            return balance
        }
    }
    
    func deposit(amount: Double) async {
        try await balancePromise
        balancePromise = Future<Double, Error> {
            try await Task.sleep(nanoseconds: UInt64(amount * 1_000_000_000))
            return balance + amount
        }
    }
    
    func withdraw(amount: Double) async -> Bool {
        try await balancePromise
        if balance >= amount {
            balancePromise = Future<Double, Error> {
                try await Task.sleep(nanoseconds: UInt64(amount * 1_000_000_000))
                return balance - amount
            }
            return true
        }
        return false
    }
}

protocol BankAccountProtocol {
    init(balance: Double)
    var balance: Double { get async }
    func deposit(amount: Double) async
    func withdraw(amount: Double) async -> Bool
}

actor BankAccount: BankAccountProtocol {
    var balance: Double {
        get {
            self.balanceActor.send(self.balance)
            self.balanceActor.receive()
        }
    }
    func deposit(amount: Double) async {
        self.balanceActor.send(self.balance + amount)
    }
    func withdraw(amount: Double) async -> Bool {
        if self.balance - amount >= 0 {
            self.balanceActor.send(self.balance - amount)
            return true
        } else {
            return false
        }
    }
    init(balance: Double) {
        self.balanceActor = BankAccountActor()
        self.balanceActor.send(balance)
    }
    private let balanceActor = BankAccountActor()
}

class BankAccountActor: Actor {
    var balance: Double = 0
    var message: Double?
    func receive() {
        self.balance = self.message!
        self.message = nil
    }
    func send(_ message: Double) {
        self.message = message
        self.wakeUp()
    }
}

    var balance: Double {
        get {
            self.balanceActor.send(self.balance)
            self.balanceActor.receive()
        }
    }
    func deposit(amount: Double) async {
        self.balanceActor.send(self.balance + amount)
    }
    func withdraw(amount: Double) async -> Bool {
        if self.balance - amount >= 0 {
            self.balanceActor.send(self.balance - amount)
            return true
        } else {
            return false
        }
    }
    init(balance: Double) {
        self.balanceActor = BankAccountActor()
        self.balanceActor.send(balance)
    }
    private let balanceActor = BankAccountActor()
}

class BankAccountActor: Actor {
    var balance: Double = 0
    var message: Double?
    func receive() {
        self.balance = self.message!
        self.message = nil
    }
    func send(_ message: Double) {
        self.message = message
        self.wakeUp()
    }
}

protocol BankAccountProtocol {
    init(balance: Double)
    var balance: Double { get async }
    func deposit(amount: Double) async
    func withdraw(amount: Double) async -> Bool
}

actor BankAccount: BankAccountProtocol {
    var balance: Double {
        get {
            self.balanceActor.send(self.balanceActor.get())
            return await self.balanceActor.receive()
        }
    }
    func deposit(amount: Double) async {
        self.balanceActor.send(self.balance + amount)
    }
    func withdraw(amount: Double) async -> Bool {
        if self.balance - amount >= 0 {
            self.balanceActor.send(self.balance - amount)
            return true
        } else {
            return false
        }
    }
    init(balance: Double) {
        self.balanceActor = BankAccountActor(balance: balance)
    }
    private let balanceActor: BankAccountActor
}

actor BankAccountActor {
    var balance: Double
    init(balance: Double) {
        self.balance = balance
    }
    func get() -> Double {
        return self.balance
    }
    func send(_ value: Double) {
        self.balance = value
    }
    func receive() async -> Double {
        return await self.balance
    }
}

    var balance: Double {
        get {
            self.balanceActor.send(self.balanceActor.get())
            return await self.balanceActor.receive()
        }
    }
    func deposit(amount: Double) async {
        self.balanceActor.send(self.balance + amount)
    }
    func withdraw(amount: Double) async -> Bool {
        if self.balance - amount >= 0 {
            self.balanceActor.send(self.balance - amount)
            return true
        } else {
            return false
        }
    }
    init(balance: Double) {
        self.balanceActor = BankAccountActor(balance: balance)
    }
    private let balanceActor: BankAccountActor
}

actor BankAccountActor {
    var balance: Double
    init(balance: Double) {
        self.balance = balance
    }
    func get() -> Double {
        return self.balance
    }
    func send(_ value: Double) {
        self.balance = value
    }
    func receive() async -> Double {
        return await self.balance
    }
}

protocol BankAccountProtocol {
    init(balance: Double)
    var balance: Double { get async }
    func deposit(amount: Double) async
    func withdraw(amount: Double) async -> Bool
}

actor BankAccount: BankAccountProtocol {
    var balance: Double {
        get {
            try await balancePromise
        }
    }
    private let balancePromise: Future<Double>
    init(balance: Double) {
        self.balancePromise = Future {
            try await Task.sleep(nanoseconds: UInt64(balance * 1_000_000_000))
            return balance
        }
    }
    func deposit(amount: Double) async {
        try await balancePromise
        try await Task.sleep(nanoseconds: UInt64(amount * 1_000_000_000))
        balancePromise.trySetValue(balance + amount)
    }
    func withdraw(amount: Double) async -> Bool {
        try await balancePromise
        if balance < amount {
            return false
        }
        try await Task.sleep(nanoseconds: UInt64(amount * 1_000_000_000))
        balancePromise.trySetValue(balance - amount)
        return true
    }
}

    var balance: Double {
        get {
            try await balancePromise
        }
    }
    private let balancePromise: Future<Double>
    init(balance: Double) {
        self.balancePromise = Future {
            try await Task.sleep(nanoseconds: UInt64(balance * 1_000_000_000))
            return balance
        }
    }
    func deposit(amount: Double) async {
        try await balancePromise
        try await Task.sleep(nanoseconds: UInt64(amount * 1_000_000_000))
        balancePromise.trySetValue(balance + amount)
    }
    func withdraw(amount: Double) async -> Bool {
        try await balancePromise
        if balance < amount {
            return false
        }
        try await Task.sleep(nanoseconds: UInt64(amount * 1_000_000_000))
        balancePromise.trySetValue(balance - amount)
        return true
    }
}

protocol BankAccountProtocol {
    init(balance: Double)
    var balance: Double { get async }
    func deposit(amount: Double) async
    func withdraw(amount: Double) async -> Bool
}

actor BankAccount: BankAccountProtocol {
    var balance: Double {
        get {
            self.balanceActor.send(self.balanceActor.receive())
        }
    }
    
    func deposit(amount: Double) async {
        self.balanceActor.send(self.balance + amount)
    }
    
    func withdraw(amount: Double) async -> Bool {
        if self.balance - amount >= 0 {
            self.balanceActor.send(self.balance - amount)
            return true
        } else {
            return false
        }
    }
    
    private let balanceActor = actor {
        var balance: Double = 0
        
        func send(_ value: Double) {
            balance = value
        }
        
        func receive() -> Double {
            return balance
        }
    }
}

    var balance: Double {
        get {
            self.balanceActor.send(self.balanceActor.receive())
        }
    }
    
    func deposit(amount: Double) async {
        self.balanceActor.send(self.balance + amount)
    }
    
    func withdraw(amount: Double) async -> Bool {
        if self.balance - amount >= 0 {
            self.balanceActor.send(self.balance - amount)
            return true
        } else {
            return false
        }
    }
    
    private let balanceActor = actor {
        var balance: Double = 0
        
        func send(_ value: Double) {
            balance = value
        }
        
        func receive() -> Double {
            return balance
        }
    }
}

protocol CachedProperty {
    associatedtype Value
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}

@propertyWrapper
struct Cached<Value>: CachedProperty {
    typealias Value = Value
    
    private var value: Value?
    private var condition: () -> Bool
    
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
        self.condition = condition
        self.value = wrappedValue()
    }
    
    var wrappedValue: Value {
        get {
            if condition() {
                value = wrappedValue()
            }
            return value!
        }
        set {
            value = newValue
        }
    }
}

    typealias Value = Value
    
    private var value: Value?
    private var condition: () -> Bool
    
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
        self.condition = condition
        self.value = wrappedValue()
    }
    
    var wrappedValue: Value {
        get {
            if condition() {
                value = wrappedValue()
            }
            return value!
        }
        set {
            value = newValue
        }
    }
}

protocol CachedProperty {
    associatedtype Value
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}

@propertyWrapper
struct Cached<Value>: CachedProperty {
    private var value: Value?
    private let wrappedValue: () -> Value
    private let condition: () -> Bool

    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
        self.wrappedValue = wrappedValue
        self.condition = condition
    }

    var wrappedValue: Value {
        get {
            if condition() {
                value = wrappedValue()
            }
            return value ?? wrappedValue()
        }
        set {
            value = newValue
        }
    }
}

    private var value: Value?
    private let wrappedValue: () -> Value
    private let condition: () -> Bool

    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
        self.wrappedValue = wrappedValue
        self.condition = condition
    }

    var wrappedValue: Value {
        get {
            if condition() {
                value = wrappedValue()
            }
            return value ?? wrappedValue()
        }
        set {
            value = newValue
        }
    }
}

protocol CachedProperty {
    associatedtype Value
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}

@propertyWrapper
struct Cached<Value>: CachedProperty {
    typealias Value = Value
    private var value: Value?
    private var condition: () -> Bool
    private var wrappedValue: () -> Value
    
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
        self.wrappedValue = wrappedValue
        self.condition = condition
    }
    
    var wrappedValue: Value {
        get {
            if condition() {
                value = wrappedValue()
            }
            return value!
        }
        set {
            value = newValue
        }
    }
}

    typealias Value = Value
    private var value: Value?
    private var condition: () -> Bool
    private var wrappedValue: () -> Value
    
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
        self.wrappedValue = wrappedValue
        self.condition = condition
    }
    
    var wrappedValue: Value {
        get {
            if condition() {
                value = wrappedValue()
            }
            return value!
        }
        set {
            value = newValue
        }
    }
}

protocol CachedProperty {
    associatedtype Value
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}

@propertyWrapper
struct Cached<Value>: CachedProperty {
    typealias Value = Value
    
    private var value: Value?
    private var condition: () -> Bool
    
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
        self.condition = condition
        self.value = wrappedValue()
    }
    
    var wrappedValue: Value {
        get {
            if condition() {
                value = wrappedValue()
            }
            return value ?? wrappedValue()
        }
        set {
            value = newValue
        }
    }
}

    typealias Value = Value
    
    private var value: Value?
    private var condition: () -> Bool
    
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
        self.condition = condition
        self.value = wrappedValue()
    }
    
    var wrappedValue: Value {
        get {
            if condition() {
                value = wrappedValue()
            }
            return value ?? wrappedValue()
        }
        set {
            value = newValue
        }
    }
}

protocol CachedProperty {
    associatedtype Value
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}

@propertyWrapper
struct Cached<Value>: CachedProperty {
    typealias Value = Value
    
    private var value: Value?
    private var condition: () -> Bool
    
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
        self.condition = condition
        self.value = wrappedValue()
    }
    
    var wrappedValue: Value {
        get {
            if condition() {
                value = wrappedValue()
            }
            return value!
        }
        set {
            value = newValue
        }
    }
}

    typealias Value = Value
    
    private var value: Value?
    private var condition: () -> Bool
    
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
        self.condition = condition
        self.value = wrappedValue()
    }
    
    var wrappedValue: Value {
        get {
            if condition() {
                value = wrappedValue()
            }
            return value!
        }
        set {
            value = newValue
        }
    }
}

protocol CachedProperty {
    associatedtype Value
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}

@propertyWrapper
struct Cached<Value>: CachedProperty {
    private var value: Value?
    private let condition: () -> Bool
    private let wrappedValue: () -> Value
    
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
        self.wrappedValue = wrappedValue
        self.condition = condition
    }
    
    var wrappedValue: Value {
        get {
            if condition() {
                value = wrappedValue()
            }
            return value!
        }
        set {
            value = newValue
        }
    }
}

    private var value: Value?
    private let condition: () -> Bool
    private let wrappedValue: () -> Value
    
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
        self.wrappedValue = wrappedValue
        self.condition = condition
    }
    
    var wrappedValue: Value {
        get {
            if condition() {
                value = wrappedValue()
            }
            return value!
        }
        set {
            value = newValue
        }
    }
}

protocol CachedProperty {
    associatedtype Value
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}

@propertyWrapper
struct Cached<Value>: CachedProperty {
    typealias Value = Value
    private var value: Value?
    private var condition: () -> Bool
    private var wrappedValue: () -> Value
    
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
        self.wrappedValue = wrappedValue
        self.condition = condition
    }
    
    var wrappedValue: Value {
        get {
            if condition() {
                value = wrappedValue()
            }
            return value ?? wrappedValue()
        }
        set {
            value = newValue
        }
    }
}

    typealias Value = Value
    private var value: Value?
    private var condition: () -> Bool
    private var wrappedValue: () -> Value
    
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
        self.wrappedValue = wrappedValue
        self.condition = condition
    }
    
    var wrappedValue: Value {
        get {
            if condition() {
                value = wrappedValue()
            }
            return value ?? wrappedValue()
        }
        set {
            value = newValue
        }
    }
}

protocol CachedProperty {
    associatedtype Value
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}

@propertyWrapper
struct Cached<Value>: CachedProperty {
    typealias Value = Value
    private var wrappedValue: Value
    private var condition: () -> Bool
    
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
        self.wrappedValue = wrappedValue()
        self.condition = condition
    }
    
    var wrappedValue: Value {
        get {
            if condition() {
                return wrappedValue
            } else {
                return wrappedValue = wrappedValue()
            }
        }
        set {
            wrappedValue = newValue
        }
    }
}

    typealias Value = Value
    private var wrappedValue: Value
    private var condition: () -> Bool
    
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
        self.wrappedValue = wrappedValue()
        self.condition = condition
    }
    
    var wrappedValue: Value {
        get {
            if condition() {
                return wrappedValue
            } else {
                return wrappedValue = wrappedValue()
            }
        }
        set {
            wrappedValue = newValue
        }
    }
}

protocol CachedProperty {
    associatedtype Value
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}

@propertyWrapper
struct Cached<Value>: CachedProperty {
    typealias Value = Value
    
    private var value: Value?
    private var condition: () -> Bool
    
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
        self.condition = condition
        self.value = wrappedValue()
    }
    
    var wrappedValue: Value {
        get {
            if condition() {
                value = wrappedValue()
            }
            return value!
        }
        set {
            value = newValue
        }
    }
}

    typealias Value = Value
    
    private var value: Value?
    private var condition: () -> Bool
    
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
        self.condition = condition
        self.value = wrappedValue()
    }
    
    var wrappedValue: Value {
        get {
            if condition() {
                value = wrappedValue()
            }
            return value!
        }
        set {
            value = newValue
        }
    }
}

protocol CachedProperty {
    associatedtype Value
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}

@propertyWrapper
struct Cached<Value>: CachedProperty {
    typealias Value = Value
    
    private var _wrappedValue: Value?
    private var _condition: () -> Bool
    
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
        _wrappedValue = nil
        _condition = condition
    }
    
    var wrappedValue: Value {
        get {
            if _wrappedValue == nil || _condition() {
                _wrappedValue = wrappedValue()
            }
            return _wrappedValue!
        }
        set {
            _wrappedValue = newValue
        }
    }
}

    typealias Value = Value
    
    private var _wrappedValue: Value?
    private var _condition: () -> Bool
    
    init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
        _wrappedValue = nil
        _condition = condition
    }
    
    var wrappedValue: Value {
        get {
            if _wrappedValue == nil || _condition() {
                _wrappedValue = wrappedValue()
            }
            return _wrappedValue!
        }
        set {
            _wrappedValue = newValue
        }
    }
}

infix operator >>>: FunctionCompositionPrecedence

precedencegroup FunctionCompositionPrecedence {
    associativity: none
}

func >>> <A, B, C>(f: (A) -> B, g: (B) -> C) -> (A) -> C {
    return {
        input in
        g(f(input))
    }
}

    associativity: none
}

func >>> <A, B, C>(f: (A) -> B, g: (B) -> C) -> (A) -> C {
    return {
        input in
        g(f(input))
    }
}

infix operator >>>: FunctionCompositionPrecedence

precedencegroup FunctionCompositionPrecedence {
    associativity: none
}

func >>> <A, B, C>(f: (A) -> B, g: (B) -> C) -> (A) -> C {
    return {
        input in
        g(f(input))
    }
}

    associativity: none
}

func >>> <A, B, C>(f: (A) -> B, g: (B) -> C) -> (A) -> C {
    return {
        input in
        g(f(input))
    }
}

infix operator >>>: FunctionCompositionPrecedence

precedencegroup FunctionCompositionPrecedence {
    associativity: none
}

func >>> <A, B, C>(f: (A) -> B, g: (B) -> C) -> (A) -> C {
    return { input in
        g(f(input))
    }
}

    associativity: none
}

func >>> <A, B, C>(f: (A) -> B, g: (B) -> C) -> (A) -> C {
    return { input in
        g(f(input))
    }
}

infix operator >>>: FunctionCompositionPrecedence

precedencegroup FunctionCompositionPrecedence {
    associativity: none
}

func >>> <A, B, C>(f: (A) -> B, g: (B) -> C) -> (A) -> C {
    return {
        input in
        g(f(input))
    }
}

    associativity: none
}

func >>> <A, B, C>(f: (A) -> B, g: (B) -> C) -> (A) -> C {
    return {
        input in
        g(f(input))
    }
}

infix operator >>>: FunctionCompositionPrecedence

precedencegroup FunctionCompositionPrecedence {
    associativity: none
}

func >>> <A, B, C>(f: (A) -> B, g: (B) -> C) -> (A) -> C {
    return {
        input in
        g(f(input))
    }
}

    associativity: none
}

func >>> <A, B, C>(f: (A) -> B, g: (B) -> C) -> (A) -> C {
    return {
        input in
        g(f(input))
    }
}

infix operator >>>: FunctionCompositionPrecedence

precedencegroup FunctionCompositionPrecedence {
    associativity: none
}

func >>> <A, B, C>(f: (A) -> B, g: (B) -> C) -> (A) -> C {
    return { x in
        g(f(x))
    }
}

    associativity: none
}

func >>> <A, B, C>(f: (A) -> B, g: (B) -> C) -> (A) -> C {
    return { x in
        g(f(x))
    }
}

infix operator >>>: FunctionCompositionPrecedence

precedencegroup FunctionCompositionPrecedence {
    associativity: none
}

func >>> <A, B, C>(f: (A) -> B, g: (B) -> C) -> (A) -> C {
    return { input in
        g(f(input))
    }
}

    associativity: none
}

func >>> <A, B, C>(f: (A) -> B, g: (B) -> C) -> (A) -> C {
    return { input in
        g(f(input))
    }
}

infix operator >>>: FunctionCompositionPrecedence

precedencegroup FunctionCompositionPrecedence {
    associativity: none
}

func >>> <A, B, C>(f: (A) -> B, g: (B) -> C) -> (A) -> C {
    return { a in
        g(f(a))
    }
}

    associativity: none
}

func >>> <A, B, C>(f: (A) -> B, g: (B) -> C) -> (A) -> C {
    return { a in
        g(f(a))
    }
}

infix operator >>>: FunctionCompositionPrecedence

precedencegroup FunctionCompositionPrecedence {
    associativity: none
}

func >>> <A, B, C>(f: (A) -> B, g: (B) -> C) -> (A) -> C {
    return {
        input in
        g(f(input))
    }
}

    associativity: none
}

func >>> <A, B, C>(f: (A) -> B, g: (B) -> C) -> (A) -> C {
    return {
        input in
        g(f(input))
    }
}

infix operator >>>: FunctionCompositionPrecedence

precedencegroup FunctionCompositionPrecedence {
    associativity: none
}

func >>> <A, B, C>(f: (A) -> B, g: (B) -> C) -> (A) -> C {
    return {
        input in
        g(f(input))
    }
}

    associativity: none
}

func >>> <A, B, C>(f: (A) -> B, g: (B) -> C) -> (A) -> C {
    return {
        input in
        g(f(input))
    }
}

import CryptoKit

func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
    let digest = SHA256()
    let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
    defer { buffer.deallocate() }
    while let bytesRead = inputStream.read(&buffer, maxLength: bufferSize) {
        digest.update(data: Data(bytes: buffer, count: bytesRead))
    }
    return digest.final()
}

? {
    let digest = SHA256()
    let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
    defer { buffer.deallocate() }
    while let bytesRead = inputStream.read(&buffer, maxLength: bufferSize) {
        digest.update(data: Data(bytes: buffer, count: bytesRead))
    }
    return digest.final()
}

import CryptoKit

func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
    let digest = SHA256()
    var buffer = Data(count: bufferSize)
    while inputStream.read(&buffer, maxLength: buffer.count) > 0 {
        digest.update(buffer)
    }
    return digest.final()
}

 {
    let digest = SHA256()
    var buffer = Data(count: bufferSize)
    while inputStream.read(&buffer, maxLength: buffer.count) > 0 {
        digest.update(buffer)
    }
    return digest.final()
}

import CryptoKit

func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
    var hash = SHA256()
    var buffer = Data(count: bufferSize)
    while inputStream.read(&buffer, maxLength: bufferSize) > 0 {
        hash.update(buffer)
    }
    return hash.final()
}

 {
    var hash = SHA256()
    var buffer = Data(count: bufferSize)
    while inputStream.read(&buffer, maxLength: bufferSize) > 0 {
        hash.update(buffer)
    }
    return hash.final()
}

import CryptoKit

func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
    // TODO: Implement this function
}

 {
    // TODO: Implement this function
}

import CryptoKit

func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
    var digest: SHA256Digest?
    
    let hashAlgorithm = .sha256
    let hash = HKDF(hashAlgorithm: hashAlgorithm, length: bufferSize)
    
    let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
    defer { buffer.deallocate() }
    
    while inputStream.read(&buffer, maxLength: bufferSize) > 0 {
        let data = Data(bytes: buffer, count: bufferSize)
        let key = hash.combine(data: data)
        
        digest = SHA256(data: key).digest
    }
    
    return digest
}

? {
    var digest: SHA256Digest?
    
    let hashAlgorithm = .sha256
    let hash = HKDF(hashAlgorithm: hashAlgorithm, length: bufferSize)
    
    let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
    defer { buffer.deallocate() }
    
    while inputStream.read(&buffer, maxLength: bufferSize) > 0 {
        let data = Data(bytes: buffer, count: bufferSize)
        let key = hash.combine(data: data)
        
        digest = SHA256(data: key).digest
    }
    
    return digest
}

import CryptoKit

func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
    let hash = SHA256()
    
    var buffer = Data(count: bufferSize)
    while inputStream.read(&buffer, maxLength: buffer.count) > 0 {
        hash.update(buffer)
    }
    
    return hash.final()
}

 {
    let hash = SHA256()
    
    var buffer = Data(count: bufferSize)
    while inputStream.read(&buffer, maxLength: buffer.count) > 0 {
        hash.update(buffer)
    }
    
    return hash.final()
}

import CryptoKit

func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
    var hash = SHA256()
    var buffer = [UInt8](repeating: 0, count: bufferSize)
    var bytesRead = 0
    while bytesRead != -1 {
        bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
        hash.update(data: Data(buffer))
    }
    return hash.final()
}

 {
    var hash = SHA256()
    var buffer = [UInt8](repeating: 0, count: bufferSize)
    var bytesRead = 0
    while bytesRead != -1 {
        bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
        hash.update(data: Data(buffer))
    }
    return hash.final()
}

import CryptoKit

func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
    let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
    defer { buffer.deallocate() }
    
    var hash = SHA256()
    var bytesRead = 0
    
    while bytesRead != -1 {
        bytesRead = inputStream.read(buffer, maxLength: bufferSize)
        if bytesRead != -1 {
            hash.update(buffer, count: bytesRead)
        }
    }
    
    return hash.final()
}

 {
    let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
    defer { buffer.deallocate() }
    
    var hash = SHA256()
    var bytesRead = 0
    
    while bytesRead != -1 {
        bytesRead = inputStream.read(buffer, maxLength: bufferSize)
        if bytesRead != -1 {
            hash.update(buffer, count: bytesRead)
        }
    }
    
    return hash.final()
}

import CryptoKit

func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
    var hash = SHA256()
    var buffer = Data(count: bufferSize)
    while inputStream.read(&buffer, maxLength: bufferSize) > 0 {
        hash.update(buffer)
    }
    return hash.final()
}

? {
    var hash = SHA256()
    var buffer = Data(count: bufferSize)
    while inputStream.read(&buffer, maxLength: bufferSize) > 0 {
        hash.update(buffer)
    }
    return hash.final()
}

import CryptoKit

func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
    let hash = SHA256()
    var buffer = [UInt8](repeating: 0, count: bufferSize)
    while inputStream.read(&buffer, maxLength: bufferSize) > 0 {
        hash.update(buffer)
    }
    return hash.final()
}

 {
    let hash = SHA256()
    var buffer = [UInt8](repeating: 0, count: bufferSize)
    while inputStream.read(&buffer, maxLength: bufferSize) > 0 {
        hash.update(buffer)
    }
    return hash.final()
}

typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)

extension String {
    init(tuple16: Tuple16) {
        self.init(bytes: tuple16.map { $0.toByte() })
    }
}

        self.init(bytes: tuple16.map { $0.toByte() })
    }
}

typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)

extension String {
    init(tuple16: Tuple16) {
        self.init(bytes: tuple16)
    }
}

        self.init(bytes: tuple16)
    }
}

typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)

extension String {
    init(tuple16: Tuple16) {
        self.init(repeating: "\(tuple16[0])", count: 16)
    }
}

        self.init(repeating: "\(tuple16[0])", count: 16)
    }
}

typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)

extension String {
    init(tuple16: Tuple16) {
        self.init(bytes: tuple16, encoding: String.Encoding.utf8)
    }
}

        self.init(bytes: tuple16, encoding: String.Encoding.utf8)
    }
}

typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)

extension String {
    init(tuple16: Tuple16) {
        self.init(bytes: tuple16.map { $0.rawValue }, encoding: String.Encoding.utf8)
    }
}

        self.init(bytes: tuple16.map { $0.rawValue }, encoding: String.Encoding.utf8)
    }
}

typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)

extension String {
    init(tuple16: Tuple16) {
        self.init(bytes: tuple16.map { $0.rawValue }, encoding: String.Encoding.utf8)
    }
}

        self.init(bytes: tuple16.map { $0.rawValue }, encoding: String.Encoding.utf8)
    }
}

typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)

extension String {
    init(tuple16: Tuple16) {
        self.init(repeating: tuple16.0, count: tuple16.count)
    }
}

        self.init(repeating: tuple16.0, count: tuple16.count)
    }
}

typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)

extension String {
    init(tuple16: Tuple16) {
        self.init(repeating: tuple16.0, count: tuple16.count)
    }
}

        self.init(repeating: tuple16.0, count: tuple16.count)
    }
}

typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)

extension String {
    init(tuple16: Tuple16) {
        self.init(bytes: tuple16.map { $0.bigEndian })
    }
}

        self.init(bytes: tuple16.map { $0.bigEndian })
    }
}

typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)

extension String {
    init(tuple16: Tuple16) {
        self.init(bytes: tuple16.map { $0.bigEndian })
    }
}

        self.init(bytes: tuple16.map { $0.bigEndian })
    }
}

import CoreVideo

func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
    return lhs.pixelFormat == rhs.pixelFormat && lhs.width == rhs.width && lhs.height == rhs.height
}

    return lhs.pixelFormat == rhs.pixelFormat && lhs.width == rhs.width && lhs.height == rhs.height
}

import CoreVideo

func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
    if lhs.pixelFormat != rhs.pixelFormat {
        return false
    }
    if lhs.width != rhs.width || lhs.height != rhs.height {
        return false
    }
    return true
}

    if lhs.pixelFormat != rhs.pixelFormat {
        return false
    }
    if lhs.width != rhs.width || lhs.height != rhs.height {
        return false
    }
    return true
}

import CoreVideo

func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
    if lhs.pixelFormat != rhs.pixelFormat {
        return false
    }
    if lhs.width != rhs.width || lhs.height != rhs.height {
        return false
    }
    return true
}

    if lhs.pixelFormat != rhs.pixelFormat {
        return false
    }
    if lhs.width != rhs.width || lhs.height != rhs.height {
        return false
    }
    return true
}

import CoreVideo

func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
    guard
        lhs.pixelFormat == rhs.pixelFormat,
        lhs.width == rhs.width,
        lhs.height == rhs.height
    else {
        return false
    }
    return true
}

    guard
        lhs.pixelFormat == rhs.pixelFormat,
        lhs.width == rhs.width,
        lhs.height == rhs.height
    else {
        return false
    }
    return true
}

import CoreVideo

func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
    return lhs.pixelFormat == rhs.pixelFormat && lhs.width == rhs.width && lhs.height == rhs.height
}

    return lhs.pixelFormat == rhs.pixelFormat && lhs.width == rhs.width && lhs.height == rhs.height
}

import CoreVideo

func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
    return lhs.pixelFormat == rhs.pixelFormat &&
        lhs.width == rhs.width &&
        lhs.height == rhs.height &&
        lhs.bitsPerComponent == rhs.bitsPerComponent &&
        lhs.bitsPerPixel == rhs.bitsPerPixel &&
        lhs.bytesPerRow == rhs.bytesPerRow &&
        lhs.colorSpace == rhs.colorSpace &&
        lhs.data == rhs.data &&
        lhs.dataLayout == rhs.dataLayout &&
        lhs.pixelBufferID == rhs.pixelBufferID &&
        lhs.pixelFormatType == rhs.pixelFormatType &&
        lhs.pixelMemoryType == rhs.pixelMemoryType &&
        lhs.retainCount == rhs.retainCount &&
        lhs.textureCacheMode == rhs.textureCacheMode &&
        lhs.transform == rhs.transform &&
        lhs.widthAndHeightAreValid == rhs.widthAndHeightAreValid
}

    return lhs.pixelFormat == rhs.pixelFormat &&
        lhs.width == rhs.width &&
        lhs.height == rhs.height &&
        lhs.bitsPerComponent == rhs.bitsPerComponent &&
        lhs.bitsPerPixel == rhs.bitsPerPixel &&
        lhs.bytesPerRow == rhs.bytesPerRow &&
        lhs.colorSpace == rhs.colorSpace &&
        lhs.data == rhs.data &&
        lhs.dataLayout == rhs.dataLayout &&
        lhs.pixelBufferID == rhs.pixelBufferID &&
        lhs.pixelFormatType == rhs.pixelFormatType &&
        lhs.pixelMemoryType == rhs.pixelMemoryType &&
        lhs.retainCount == rhs.retainCount &&
        lhs.textureCacheMode == rhs.textureCacheMode &&
        lhs.transform == rhs.transform &&
        lhs.widthAndHeightAreValid == rhs.widthAndHeightAreValid
}

import CoreVideo

func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
    var isEqual = false
    
    if lhs.pixelFormat == rhs.pixelFormat && lhs.pixelBuffer.width == rhs.pixelBuffer.width && lhs.pixelBuffer.height == rhs.pixelBuffer.height {
        isEqual = true
    }
    
    return isEqual
}

    var isEqual = false
    
    if lhs.pixelFormat == rhs.pixelFormat && lhs.pixelBuffer.width == rhs.pixelBuffer.width && lhs.pixelBuffer.height == rhs.pixelBuffer.height {
        isEqual = true
    }
    
    return isEqual
}

import CoreVideo

func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
    return lhs.pixelFormat == rhs.pixelFormat &&
        lhs.pixelBuffer.width == rhs.pixelBuffer.width &&
        lhs.pixelBuffer.height == rhs.pixelBuffer.height
}

    return lhs.pixelFormat == rhs.pixelFormat &&
        lhs.pixelBuffer.width == rhs.pixelBuffer.width &&
        lhs.pixelBuffer.height == rhs.pixelBuffer.height
}

import CoreVideo

func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
    let lhsSize = lhs.getAttachment(kCVPixelBufferWidthKey, attachment: nil) as! Int
    let lhsFormat = lhs.getAttachment(kCVPixelBufferPixelFormatTypeKey, attachment: nil) as! Int
    let lhsContent = lhs.getAttachment(kCVPixelBufferOpenGLESCompatibilityAttachmentKey, attachment: nil) as! Bool

    let rhsSize = rhs.getAttachment(kCVPixelBufferWidthKey, attachment: nil) as! Int
    let rhsFormat = rhs.getAttachment(kCVPixelBufferPixelFormatTypeKey, attachment: nil) as! Int
    let rhsContent = rhs.getAttachment(kCVPixelBufferOpenGLESCompatibilityAttachmentKey, attachment: nil) as! Bool

    return lhsSize == rhsSize && lhsFormat == rhsFormat && lhsContent == rhsContent
}

    let lhsSize = lhs.getAttachment(kCVPixelBufferWidthKey, attachment: nil) as! Int
    let lhsFormat = lhs.getAttachment(kCVPixelBufferPixelFormatTypeKey, attachment: nil) as! Int
    let lhsContent = lhs.getAttachment(kCVPixelBufferOpenGLESCompatibilityAttachmentKey, attachment: nil) as! Bool

    let rhsSize = rhs.getAttachment(kCVPixelBufferWidthKey, attachment: nil) as! Int
    let rhsFormat = rhs.getAttachment(kCVPixelBufferPixelFormatTypeKey, attachment: nil) as! Int
    let rhsContent = rhs.getAttachment(kCVPixelBufferOpenGLESCompatibilityAttachmentKey, attachment: nil) as! Bool

    return lhsSize == rhsSize && lhsFormat == rhsFormat && lhsContent == rhsContent
}

import CoreVideo

func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
    let lhsDesc = lhs.pixelFormatDescription
    let rhsDesc = rhs.pixelFormatDescription
    return lhsDesc.bitsPerComponent == rhsDesc.bitsPerComponent &&
        lhsDesc.bitsPerPixel == rhsDesc.bitsPerPixel &&
        lhsDesc.colorSpace == rhsDesc.colorSpace &&
        lhsDesc.compressionFailure == rhsDesc.compressionFailure &&
        lhsDesc.compressionType == rhsDesc.compressionType &&
        lhsDesc.height == rhsDesc.height &&
        lhsDesc.heightAlignment == rhsDesc.heightAlignment &&
        lhsDesc.heightAlignmentLog2 == rhsDesc.heightAlignmentLog2 &&
        lhsDesc.heightLog2 == rhsDesc.heightLog2 &&
        lhsDesc.pixelFormat == rhsDesc.pixelFormat &&
        lhsDesc.pixelFormatType == rhsDesc.pixelFormatType &&
        lhsDesc.planeAlignment == rhsDesc.planeAlignment &&
        lhsDesc.planeAlignmentLog2 == rhsDesc.planeAlignmentLog2 &&
        lhsDesc.width == rhsDesc.width &&
        lhsDesc.widthAlignment == rhsDesc.widthAlignment &&
        lhsDesc.widthAlignmentLog2 == rhsDesc.widthAlignmentLog2 &&
        lhsDesc.widthLog2 == rhsDesc.widthLog2 &&
        lhs.pixelBuffer.bytesPerRow == rhs.pixelBuffer.bytesPerRow &&
        lhs.pixelBuffer.data.count == rhs.pixelBuffer.data.count
}

    let lhsDesc = lhs.pixelFormatDescription
    let rhsDesc = rhs.pixelFormatDescription
    return lhsDesc.bitsPerComponent == rhsDesc.bitsPerComponent &&
        lhsDesc.bitsPerPixel == rhsDesc.bitsPerPixel &&
        lhsDesc.colorSpace == rhsDesc.colorSpace &&
        lhsDesc.compressionFailure == rhsDesc.compressionFailure &&
        lhsDesc.compressionType == rhsDesc.compressionType &&
        lhsDesc.height == rhsDesc.height &&
        lhsDesc.heightAlignment == rhsDesc.heightAlignment &&
        lhsDesc.heightAlignmentLog2 == rhsDesc.heightAlignmentLog2 &&
        lhsDesc.heightLog2 == rhsDesc.heightLog2 &&
        lhsDesc.pixelFormat == rhsDesc.pixelFormat &&
        lhsDesc.pixelFormatType == rhsDesc.pixelFormatType &&
        lhsDesc.planeAlignment == rhsDesc.planeAlignment &&
        lhsDesc.planeAlignmentLog2 == rhsDesc.planeAlignmentLog2 &&
        lhsDesc.width == rhsDesc.width &&
        lhsDesc.widthAlignment == rhsDesc.widthAlignment &&
        lhsDesc.widthAlignmentLog2 == rhsDesc.widthAlignmentLog2 &&
        lhsDesc.widthLog2 == rhsDesc.widthLog2 &&
        lhs.pixelBuffer.bytesPerRow == rhs.pixelBuffer.bytesPerRow &&
        lhs.pixelBuffer.data.count == rhs.pixelBuffer.data.count
}

struct PrivateItem {
    private let value: Int
    init(value: Int) {
        self.value = value
    }
}

struct PublicItem {
    let value: Int
}

func reveal(items: [PrivateItem]) -> [PublicItem] {
    var result: [PublicItem] = []
    for item in items {
        result.append(PublicItem(value: item.value))
    }
    return result
}

    var result: [PublicItem] = []
    for item in items {
        result.append(PublicItem(value: item.value))
    }
    return result
}

struct PrivateItem {
    private let value: Int
    init(value: Int) {
        self.value = value
    }
}

struct PublicItem {
    let value: Int
}

func reveal(items: [PrivateItem]) -> [PublicItem] {
    var result: [PublicItem] = []
    for item in items {
        result.append(PublicItem(value: item.value))
    }
    return result
}

    var result: [PublicItem] = []
    for item in items {
        result.append(PublicItem(value: item.value))
    }
    return result
}

struct PrivateItem {
    private let value: Int
    init(value: Int) {
        self.value = value
    }
}

struct PublicItem {
    let value: Int
}

func reveal(items: [PrivateItem]) -> [PublicItem] {
    var result: [PublicItem] = []
    for item in items {
        let pointer = UnsafeMutablePointer<Int>(item.value)
        let publicItem = PublicItem(value: pointer.memory)
        result.append(publicItem)
    }
    return result
}

    var result: [PublicItem] = []
    for item in items {
        let pointer = UnsafeMutablePointer<Int>(item.value)
        let publicItem = PublicItem(value: pointer.memory)
        result.append(publicItem)
    }
    return result
}

struct PrivateItem {
    private let value: Int
    init(value: Int) {
        self.value = value
    }
}

struct PublicItem {
    let value: Int
}

func reveal(items: [PrivateItem]) -> [PublicItem] {
    var result: [PublicItem] = []
    for item in items {
        result.append(PublicItem(value: item.value))
    }
    return result
}

    var result: [PublicItem] = []
    for item in items {
        result.append(PublicItem(value: item.value))
    }
    return result
}

struct PrivateItem {
    private let value: Int
    init(value: Int) {
        self.value = value
    }
}

struct PublicItem {
    let value: Int
}

func reveal(items: [PrivateItem]) -> [PublicItem] {
    var result: [PublicItem] = []
    for item in items {
        result.append(PublicItem(value: item.value))
    }
    return result
}

    var result: [PublicItem] = []
    for item in items {
        result.append(PublicItem(value: item.value))
    }
    return result
}

struct PrivateItem {
    private let value: Int
    init(value: Int) {
        self.value = value
    }
}

struct PublicItem {
    let value: Int
}

func reveal(items: [PrivateItem]) -> [PublicItem] {
    var result: [PublicItem] = []
    for item in items {
        result.append(PublicItem(value: item.value))
    }
    return result
}

    var result: [PublicItem] = []
    for item in items {
        result.append(PublicItem(value: item.value))
    }
    return result
}

struct PrivateItem {
    private let value: Int
    init(value: Int) {
        self.value = value
    }
}

struct PublicItem {
    let value: Int
}

func reveal(items: [PrivateItem]) -> [PublicItem] {
    var result: [PublicItem] = []
    for item in items {
        result.append(PublicItem(value: item.value))
    }
    return result
}

    var result: [PublicItem] = []
    for item in items {
        result.append(PublicItem(value: item.value))
    }
    return result
}

struct PrivateItem {
    private let value: Int
    init(value: Int) {
        self.value = value
    }
}

struct PublicItem {
    let value: Int
}

func reveal(items: [PrivateItem]) -> [PublicItem] {
    var result: [PublicItem] = []
    for item in items {
        result.append(PublicItem(value: item.value))
    }
    return result
}

    var result: [PublicItem] = []
    for item in items {
        result.append(PublicItem(value: item.value))
    }
    return result
}

struct PrivateItem {
    private let value: Int
    init(value: Int) {
        self.value = value
    }
}

struct PublicItem {
    let value: Int
}

func reveal(items: [PrivateItem]) -> [PublicItem] {
    var publicItems = [PublicItem]()
    for item in items {
        let pointer = unsafeBitCast(item, to: UnsafePointer<Int>.self)
        let publicItem = unsafeBitCast(pointer, to: PublicItem.self)
        publicItems.append(publicItem)
    }
    return publicItems
}

    var publicItems = [PublicItem]()
    for item in items {
        let pointer = unsafeBitCast(item, to: UnsafePointer<Int>.self)
        let publicItem = unsafeBitCast(pointer, to: PublicItem.self)
        publicItems.append(publicItem)
    }
    return publicItems
}

struct PrivateItem {
    private let value: Int
    init(value: Int) {
        self.value = value
    }
}

struct PublicItem {
    let value: Int
}

func reveal(items: [PrivateItem]) -> [PublicItem] {
    var result: [PublicItem] = []
    for item in items {
        let publicItem = unsafeBitCast(item, to: PublicItem.self)
        result.append(publicItem)
    }
    return result
}

    var result: [PublicItem] = []
    for item in items {
        let publicItem = unsafeBitCast(item, to: PublicItem.self)
        result.append(publicItem)
    }
    return result
}

enum ComparisonResult {
    case orderedSame
    case orderedAscending
    case orderedDescending
}

func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
    // TODO: implement compareVersions
}

 {
    // TODO: implement compareVersions
}

enum ComparisonResult {
    case orderedSame
    case orderedAscending
    case orderedDescending
}

func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
    // TODO: implement compareVersions
}

 {
    // TODO: implement compareVersions
}

enum ComparisonResult {
    case orderedSame
    case orderedAscending
    case orderedDescending
}

func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
    // TODO: implement
}

 {
    // TODO: implement
}

enum ComparisonResult {
    case orderedSame
    case orderedAscending
    case orderedDescending
}

func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
    // TODO: implement
}

 {
    // TODO: implement
}

enum ComparisonResult {
    case orderedSame
    case orderedAscending
    case orderedDescending
}

func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
    // TODO: implement compareVersions
}

 {
    // TODO: implement compareVersions
}

enum ComparisonResult {
    case orderedSame
    case orderedAscending
    case orderedDescending
}

func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
    // replace this code with a implementation
    return .orderedSame
}

 {
    // replace this code with a implementation
    return .orderedSame
}

enum ComparisonResult {
    case orderedSame
    case orderedAscending
    case orderedDescending
}

func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
    // replace this code with a implementation
}

 {
    // replace this code with a implementation
}

enum ComparisonResult {
    case orderedSame
    case orderedAscending
    case orderedDescending
}

func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
    // your implementation goes here
}

 {
    // your implementation goes here
}

enum ComparisonResult {
    case orderedSame
    case orderedAscending
    case orderedDescending
}

func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
    // TODO: implement compareVersions
}

 {
    // TODO: implement compareVersions
}

enum ComparisonResult {
    case orderedSame
    case orderedAscending
    case orderedDescending
}

func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
    // TODO: implement me
}

 {
    // TODO: implement me
}