[Kotlin] Programmers 코딩테스트 입문 Day 09 수학, 문자열, 해시, 완전탐색, 조건문

개미 군단

class Solution {
    fun solution(hp: Int) = hp/5 + (hp%5)/3 + (hp%5%3)
}

 

 

 

모스부호(1)

class Solution {
    fun solution(letter: String): String {
        var result: String = ""
        val morse = mapOf<String,String>(
            ".-" to "a", "-..." to "b","-.-." to "c","-.." to "d","." to "e","..-." to "f",
        "--." to "g","...." to "h", ".." to "i",".---" to "j","-.-" to "k",".-.." to "l",
        "--" to "m","-." to "n","---" to "o", ".--." to "p","--.-" to "q",".-." to "r",
        "..." to "s", "-" to "t", "..-" to "u", "...-" to "v", ".--" to "w","-..-" to "x",
        "-.--" to "y","--.." to "z"
        )

        var temp = letter.split(" ")

        for (i in temp)
            result += morse.get(i)

        return result
    }
}

 

 

 

가위 바위 보

class Solution {
    fun solution(rsp: String): String = rsp.map{ 
        when(it){
            '2' -> '0'
            '0' -> '5'
            else -> '2'
        }
    }.joinToString("")
}

 

 

 

구슬을 나누는 경우의 수

import java.math.BigInteger

class Solution {
    fun solution(balls: Int, share: Int): BigInteger = (factorial(balls)) / ((factorial(balls - share) * factorial(share)))

    fun factorial(time: Int): BigInteger {
        var result: BigInteger = BigInteger("1")
        for (i in 2..time) result = result * i.toBigInteger()
        return result
    }
}