[SWEA] 그래프의 삼각형

 

 

[문제]

https://swexpertacademy.com/main/code/problem/problemDetail.do?contestProbId=AWbHcWd6AFcDFAV0

SW Expert Academy

 

 

 

[소스 코드]

import java.io.*;
import java.util.*;
public class Solution {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st;
		int T = Integer.parseInt(br.readLine());
		for(int tc=1;tc<=T;tc++) {
			st = new StringTokenizer(br.readLine());
			int n = Integer.parseInt(st.nextToken());
			int m = Integer.parseInt(st.nextToken());
			boolean[][] edge = new boolean[n+1][n+1];
			for(int i=0;i<m;i++) {
				st = new StringTokenizer(br.readLine());
				int x = Integer.parseInt(st.nextToken());
				int y = Integer.parseInt(st.nextToken());
				edge[x][y] = edge[y][x] = true;
			}
			int result = 0;
			for(int i=1;i<n;i++) {
				for(int j=i+1;j<n;j++) {
					if(edge[i][j]) {
						for(int k=j+1;k<=n;k++) {
							if(edge[i][k] && edge[j][k]) result++;
						}
					}
				}
			}
			System.out.println("#"+tc+" "+result);
		}
	}
}