[Kotlin] Programmers 코딩테스트 입문 Day 23 배열, 정렬, 문자열

특이한 정렬

import kotlin.math.abs

class Solution {
    fun solution(numlist: IntArray, n: Int): IntArray {
        var answer: IntArray = intArrayOf()
        var temp: MutableMap<Int, Int> = mutableMapOf()

        for (i in 0 until numlist.size) {
            temp.set(numlist[i], abs(numlist[i] - n))
        }

        temp = temp.toList().sortedBy { it.second }.toMap().toMutableMap()


        for (i in 0 until temp.size - 1) {
            if (temp.toList().get(i).second == temp.toList().get(i + 1).second) {
                if (temp.toList().get(i + 1).first > temp.toList().get(i).first) {
                    answer = answer.plus(temp.toList().get(i + 1).first)
                    answer = answer.plus(temp.toList().get(i).first)
                }else{
                    answer = answer.plus(temp.toList().get(i).first)
                }
            } else if (!answer.contains(temp.toList().get(i).first)) {
                answer = answer.plus(temp.toList().get(i).first)
            }
        }

        answer = answer.plus(temp.toList().last().first)
        return answer
    }
}

 

 

 

등수 매기기

class Solution {
    fun solution(score: Array<IntArray>): IntArray {
        var answer: IntArray = IntArray(score.size)
        val temp = score.map { (it.first().toFloat() + it.last())/2 }.toList()
        val temp2 = temp.toSet().sortedDescending().toList()

        var sum = 0
        for (i in 0 until temp2.size){
            var count = 0
            for (j in 0 until temp.size){
                if (temp2[i] == temp[j]){
                    answer.set(j,i +1 + sum)
                    count++
                }
            }
            if (count > 1) sum += count - 1
        }

        return answer
    }
}

 

 

 

옹알이 (1)

class Solution {
    fun solution(babbling: Array<String>): Int {
        val example: Array<String> = arrayOf("aya", "ye", "woo", "ma")
        var answer = 0

        babbling.forEach {
            var canSlice = false
            var str = it
            while (true){
                for (i in example){
                    if (str.startsWith(i)){
                        if (i.length != str.length){
                            str = str.slice(i.length  .. str.length-1)
                            canSlice = true
                            break;
                        }
                        answer++
                        break
                    }
                }
                if (!canSlice) break
                canSlice = false
            }
        }
        return answer
    }
}

 

 

 

로그인 성공?

class Solution {
    fun solution(id_pw: Array<String>, db: Array<Array<String>>): String {
        val id = id_pw[0]
        val pw = id_pw[1]
        var correctId = false

        db.forEach {
            if(id == it.get(0)){
                if (pw == it.get(1))
                    return "login"
                correctId = true
            }
        }
        return if (correctId) "wrong pw" else "fail"
    }
}