문제 설명 제한사항 입출력 문제풀이 import java.util.*; class Solution { public int[] solution(String[] genres, int[] plays) { int[] answer = {}; ArrayList answers = new ArrayList(); HashMap hm = new HashMap(); for(int i = 0 ; i < genres.length;i++){ if(hm.containsKey(genres[i])==true){ hm.put(genres[i],hm.get(genres[i])+plays[i]); continue; } hm.put(genres[i],plays[i]); } ArrayList arr = new ArrayList(hm.keySe..
