230819 삼총사

public int solution(int[] number) {
        int answer = 0;
	int n = number.length;

	for (int i = 0; i < n - 2; i++) {
		for (int j = i + 1; j < n - 1; j++) {
			for (int k = j + 1; k < n; k++) {
				if (number[i] + number[j] + number[k] == 0) {
					answer++;
				}
			}
		}
	}

	return answer;
}

출처:https://school.programmers.co.kr/learn/courses/30/lessons/131705