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import Foundation

final class URLProtocolMock: URLProtocol {
    static var data = [URL: (error: Error?, data: Data?)]()

    override class func canInit(with request: URLRequest) -> Bool {
        return true
    }

    override class func canonicalRequest(for request: URLRequest) -> URLRequest {

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struct BigInt {
    let string: String

    func add(_ value: BigInt) -> BigInt {
        if self.string == "0" { return value }
        if value.string == "0" { return self }

        var lhs = self.string
        var rhs = value.string

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struct BigInt {
    private let overflows: UInt64
    private var remainder: UInt64
  
    func add(_ x: BigInt) -> BigInt {
        let totalOverflows = self.overflows + x.overflows
        let result = self.remainder.addingReportingOverflow(x.remainder)

        return BigInt(

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let res = Decimal(string: "9999999999999999999999999999999999999999999")!
* Decimal(string: "99999999999998999999999999999999999")!
print(res) // 999999999999989999999999999999999989990000000000000000000000000000000000000000 - wrong
// correct result – 999999999999989999999999999999999989999999900000000000001000000000000000000001

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enum AoCDay13 {
    static func solve() -> Int {
        let pairs = input.split(separator: "\n\n")
            .map { $0.split(separator: "\n") }
            .map { (String($0[0]), String($0[1])) }

        var sum = 0
        for (index, pair) in pairs.enumerated() {
            print("====================== Pair \(index) ======================")
            print("\(pair.0)\n\(pair.1)")

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//
//  Matrix.swift
//  SudokuSolver
//
//  Created by Bohdan Savych on 19/4/22.
//

import Foundation

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//
//  MonadsExperimentations.swift
//  Algorithms
//
//  Created by Bohdan Savych on 23/10/2022.
//

import Foundation

precedencegroup CompositionPrecedence {

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//
//  DI.swift
//  MobiusNotes
//
//  Created by bsavych on 05/08/2022.
//

import Foundation

enum DIScope {

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var dict = [Int: Int?]()
let val = dict[0] // Int??

func f(_ optionalInt: Int?) -> Int { optionalInt ?? 0 }

//f(val) // compiler error
f(val.flatten()) // works

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protocol ActionDoable: AnyObject {
  func doAction(with value: Int)
}

class A: ActionDoable {
  func doAction(with value: Int) {
    print("do from A \(value)")

  }
}