42. 삼총사

 

using System;

public class Solution {
    public int solution(int[] number) {
        int answer = 0;
        
        for (int i = 0; i < number.Length; ++i)
            {
                for (int j = i + 1; j < number.Length; ++j)
                {
                    for (int z = j + 1; z < number.Length; ++z)
                    {
                        if (number[i] + number[j] + number[z] == 0)
                        {
                            answer++;
                        }
                    }
                }
            }
        
        return answer;
    }
}

 * 3중 for문으로 풀이