릿코드 3005. Count Elements With Maximum Frequency 코틀린

그냥 모든값 해시맵에 담아서 빈도수 찾아내고,
그 해시맵의 빈도수를 다시 다른해시맵에 담아서,가장큰값 밸류*키해서 리턴

정답

class Solution {
    fun maxFrequencyElements(nums: IntArray): Int {
        val numMap = hashMapOf<Int, Int>()
        for (i in nums){
            numMap[i]=numMap[i]?.plus(1)?:1
        }
        val sizeMap= hashMapOf<Int,Int>()
        for (i in numMap){
            sizeMap[i.value]= sizeMap[i.value]?.plus(1)?:1
        }
        val max = sizeMap.maxOf { it.key }
        return sizeMap[max]!!*max
    }
}