230623 의상

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

	for (String[] clothe : clothes) {
		String type = clothe[1];
		map.put(type, map.getOrDefault(type, 0) + 1);
	}

	int answer = 1;
	for (int count : map.values()) {
		answer *= (count + 1);
	}

	return answer - 1;
}

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