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// Write your code here
func solve() {
    
    // know the cost of balloons
    let costOfBallons = getArray(readLine()!)
    // know the number of participants
    let numberOfParticipant = Int(readLine()!)!
 
    // some holder to capture who has solved the problem
    var firstParticipantSolved = 0

Roshankumar350

General iOS, CS questions and interview prep resources.

• Raywenderlich Swift Interview Questions and Answers

• iOS Interview Questions for Senior Developers (useful even if you're not senior yet)

• Swift Interview Tips by Sean Allen

• My Approach to Learning iOS

Roshankumar350

• System Design in Software Development

• The Lost Art of System Design - John Sundell, Swift & Fika 2018

• Grokking the Mobile System Design interview

• Mobile System Design Interviews (iOS and Android)

• How to Succeed in a System Design Interview

Roshankumar350

func findIndexOf(targetSum sum: Int, in inputArray: [Int]) -> (Int,Int) {
    //Output index
    var indices: (Int,Int) = (-1, -1)
    //count of input array
    let inputArrayCount = inputArray.count
    
    for (index, eachElement) in inputArray.enumerated() {
        
        for sartIndex in index..<inputArrayCount {
            if eachElement + inputArray[sartIndex] == sum {

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func findIndexOf(targetSum sum: Int, in inputArray: [Int]) -> (Int,Int) {
    // Output Indices
    var indices: (Int,Int) = (-1, -1)
    // hastable
    var hashTable = [Int:Int]()
    // enumerate it
    for (index, value) in inputArray.enumerated() {
        // check if hastable has complementry value (i.e index)
        if let rightIndex = hashTable[value] {
            indices.0 = index

Roshankumar350

import Foundation
import Combine

// MARK: - Error
enum APIError: Error, LocalizedError {
    case unKnown
    case apiError(reason: String)
}

extension APIError {

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func isvalidPasswordPolicy(_ password: String) -> Bool {
    // Output
    var isValidPasswordPolicy = false
    
    // Get the component of each password policy
    let components = password.components(separatedBy: CharacterSet.whitespaces)

    // From 1st component  get the lower and upper bound
    let first = components[0].components(separatedBy: "-")
    guard let lowerBound = Int(first.first ?? "0") else { return isValidPasswordPolicy }

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func isvalidPasswordPolicy(_ password: String) -> Bool {
    // Output
    var isValidPasswordPolicy = false
    
    // Get the component of each password policy
    let components = password.components(separatedBy: CharacterSet.whitespaces)

    // From 1st component  get the lower and upper bound
    let first = components[0].components(separatedBy: "-")
    guard var lowerBound = Int(first.first ?? "0") else { return isValidPasswordPolicy }

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// Problem: https://www.pramp.com/challenge/2WBx3Axln1t7JQ2jQq96

func findBusiestPeriod(data: [[Int]]) -> Int {
    var timeStamp = 0
    
    var busiest = -1
    var currentBusiest = 0
    
    let length = data.count
    

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// MARK: Data Structure

public class BinaryTreeNode<Element: Comparable> {
    
    weak var parent:BinaryTreeNode?
    
    var leftNode:BinaryTreeNode?
    var payload:Element
    var rightNode:BinaryTreeNode?