[프로그래머스]#42578 위장

문제

https://programmers.co.kr/learn/courses/30/lessons/42578

풀이

import java.util.*;

class Solution {
    public int solution(String[][] clothes) {
        int answer = 0;
        int num = 1;
        HashMap<String , Integer> map = new HashMap<String , Integer>();
        for(int i=0; i<clothes.length; i++) {
            if(map.containsKey(clothes[i][1])){
                map.put(clothes[i][1], map.get(clothes[i][1])+1);
            }
            else{
                 map.put(clothes[i][1], 1);
            }
        }
        Set set = map.keySet();
        Iterator iterator = set.iterator();

        while (iterator.hasNext())
        {
            String key = (String)iterator.next();
            num*=(map.get(key)+1);
        }
        answer = num-1;
        return answer;
    }
}