릿코드 2610. Convert an Array Into a 2D Array With Conditions 코틀린

그냥 해시맵에 때려박고 제일 많은거만큼 배열생성해서 하나씩넣기




정답

class Solution {
    fun findMatrix(nums: IntArray): List<List<Int>> {
        val numHashMap = hashMapOf<Int, Int>()
        val resList= mutableListOf<MutableList<Int>>()
        for (i in nums){
            numHashMap[i]=numHashMap[i]?.plus(1)?:1
        }
        val maxValue=numHashMap.values.max()
        for (i in 0..maxValue){
            val tempList = mutableListOf<Int>()
            for ((key,value) in numHashMap){
                if (value!=0){
                    tempList.add(key)
                    numHashMap[key]=numHashMap[key]!!-1
                }
            }
            if (tempList.size!=0) {
                resList.add(tempList)
            }
        }
        println(resList)
        println()


        return resList
    }
}