BOJ PS - Solution of BOJ Problem

import kotlin.math.pow

fun computeDataCount() :Double {
    val numbers = readLine()!!.split(" ")
    val firstNum= numbers[0].toDouble()
    val secondNum= numbers[1].toInt()
    val firstDigitFlag= (firstNum%10)
    var lastComputerNum:Double=0.0
    when(firstDigitFlag){
        1.0,5.0,6.0-> lastComputerNum= firstDigitFlag
        2.0,3.0,
        7.0,8.0 -> if(secondNum%4==0) lastComputerNum= (firstDigitFlag.pow(4))%10 else lastComputerNum= ((firstDigitFlag).pow(secondNum%4 ))%10
        4.0,9.0-> if(secondNum%2==0) lastComputerNum=(firstDigitFlag.pow(2))%10 else lastComputerNum=((firstDigitFlag).pow(secondNum%2 ))%10
        0.0-> lastComputerNum= 10.0
    }
    return lastComputerNum

}

fun getComputeLastDataComputer(){
    val dataCount= computeDataCount().toInt()
    println(dataCount)

}

fun main(args: Array<String>){
    val testNumber= readLine()!!.toInt()
    for(index:Int in 1..testNumber){
        getComputeLastDataComputer()
    }
}

import kotlin.math.pow

fun computeResistValue(firstColor:String, secondColor:String, thirdColor:String):Long{
    val colorMap:Map<String, Int> = mapOf("black" to 0, "brown" to 1, "red" to 2, "orange" to 3, "yellow" to 4, "green" to 5, "blue" to 6, "violet" to 7, "grey" to 8, "white" to 9)
    val baseNum=10.0
    val firstValue = colorMap[firstColor]!!
    val secondValue = colorMap[secondColor]!!
    val thirdValue = colorMap[thirdColor]!!
    val multipleValue=baseNum.pow(thirdValue)
    val result:Long= ((firstValue*10 + secondValue)*multipleValue).toLong()
    return result


}

fun getResistValue(){
    val firstColor= readLine()!!
    val secondColor= readLine()!!
    val thirdColor= readLine()!!
    val result= computeResistValue(firstColor, secondColor, thirdColor)
    println(result)

}

fun main(args: Array<String>){
    getResistValue()

}

import java.util.Scanner

fun checkBindNum(bottleNum:Long):Long{
    var num =bottleNum
    var answer:Long=0
    while(true){

        var a= num/2
        var b= num%2
        answer+=b
        num=a
        if(num.toInt() ==0){
            break;
        }
    }
    return answer
}


fun countWaterBottle(N:Long, K:Int):Long{

    var result:Long=0

    if(K>=N){
        return 0
    }
    else{
        var bottleNum=N
        while(true) {
            if (checkBindNum(bottleNum) <= K) {
                result = bottleNum - N
                break;
            } else {
                bottleNum++
            }
        }
    }
    return result
}



fun getWaterBottleCount(){
    val sc: Scanner = Scanner(System.`in`)
    val N = sc.nextLong()
    val K = sc.nextInt()
    val result= countWaterBottle(N,K)
    println(result)
}



fun main(){
    getWaterBottleCount()
}

import java.util.Scanner

fun addBigNumber(a:String, b:String){

   var lengthOfA= a.length
   var lengthOfB= b.length
   var resultString:String=""
   var sum=0
   var carry=0
   while(lengthOfA>0 || lengthOfB>0){
       var numberOfA=0
       if(lengthOfA>0){
           numberOfA= a[--lengthOfA]-'0'
       }
       var numberOfB=0
       if(lengthOfB>0){
           numberOfB= b[--lengthOfB]-'0'
       }
       sum= numberOfA + numberOfB + carry
       carry= sum/10
       sum= sum%10

       resultString+= sum.toString()

   }
   if(carry>0){
       resultString+= carry.toString()
   }

   for(index:Int in resultString.length-1 downTo 0 ){
       print(resultString[index])
   }


}

fun main(){
   val sc: Scanner = Scanner(System.`in`)
   var a =sc.next()
   var b= sc.next()
   addBigNumber(a,b)
}