[Kotlin] Programmers 코딩 기초 트레이닝 Day 11 리스트(배열)

문자 개수 세기

class Solution {
    fun solution(my_string: String): IntArray {
        var answer: IntArray = intArrayOf(0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0)

        my_string.forEach {
            if (it.isLowerCase())
                answer[it - 'A' - 6]++
            else
                answer[it - 'A']++
        }


        return answer
    }
}

 

 

배열 만들기 1

class Solution {
    fun solution(n: Int, k: Int): IntArray = (k .. n step k).toList().toIntArray()
}

 

 

글자 지우기

class Solution {
    fun solution(my_string: String, indices: IntArray): String {
        var answer: String = my_string

        indices.sorted().reversed().forEach {
            answer = answer.slice(0 until it) + answer.slice(it + 1 until answer.length)
        }

        return answer.filter { it != '1' }
    }
}

 

 

카운트 다운

class Solution {
    fun solution(start: Int, end: Int): IntArray = (end .. start).toList().reversed().toIntArray()
}

 

 

가까운 1 찾기

class Solution {
    fun solution(arr: IntArray, idx: Int): Int {
        val result = arr.slice(idx until arr.size).indexOf(1)

        return if (result != -1) result + idx else result 
    }
}