프로그래머스 - 의상

 

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package Programmers;

import java.util.Arrays;
import java.util.HashMap;

public class ProgrammingBasic {
    public static void main(String[] args) {
        String[][] clothes = {{"yellow_hat", "headgear"}, {"blue_sunglasses", "eyewear"}, {"green_turban", "headgear"}};
        solution(clothes);
    }

    public static int solution(String[][] clothes) {
        HashMap<String, Integer> hashMap = new HashMap<>();

        for(int i = 0; i < clothes.length; i++){
            String category = clothes[i][1];

            if(hashMap.containsKey(category)){
                hashMap.put(category, hashMap.get(category) + 1);
            }else{
                hashMap.put(category,1);
            }
        }

        int answer = 1;
        Object[] keys = hashMap.keySet().toArray();
        System.out.println(Arrays.toString(keys));
        for(int i = 0; i < keys.length; i++){
            String key = (String) keys[i];
            System.out.println(key);
            answer *= (hashMap.get(key)+1);
        }
        System.out.println(answer);
        return answer -1 ;
    }
}

추가 기록 예정 .. 어려운 문제였음..