[프로그래머스][Javascript / JS] 귤 고르기

https://school.programmers.co.kr/learn/courses/30/lessons/138476

프로그래머스

 

function solution(k, tangerine) {
    var map = new Map();
    for(var weight of tangerine) {
        if(map.has(weight)) {
            map.set(weight, map.get(weight)+1);
        } else {
            map.set(weight, 1);
        }
    }
    var ans = 0;
    var countArr = [...map].map((pair) => pair[1]).sort((a,b) => b - a);
    for(var weight of countArr) {
        k -= weight;
        ans++;
        if(k<=0) return ans;
    }
}