Submission #1772362

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Source Code Expand

#include <bits/stdc++.h>

#define For(i, j, k) for(int i = j; i <= k; i++)
#define Forr(i, j, k) for(int i = j; i >= k; i--)

using namespace std;

const int N = 410, M = 1e5 + 10;

int n, m;
bool G[N][N], bad[N];
int X[M], Y[M];

int main(){
	scanf("%d%d", &n, &m);
	For(i, 1, m) scanf("%d%d", &X[i], &Y[i]);
	int ans = 0;

	For(i, 1, n){
		G[i][i] = true;
		Forr(j, m, 1){
			if(G[i][X[j]]){
				if(G[i][Y[j]]){
					bad[i] = true;
					break;
				}
				G[i][Y[j]] = true;
			}
			else if(G[i][Y[j]]) G[i][X[j]] = true;
		}

		if(!bad[i]) For(j, 1, i - 1) if(!bad[j]){
			bool flag = true;
			For(k, 1, n) if(G[i][k] && G[j][k]){
				flag = false;
				break;
			}
			ans += flag;
		}
	}

	printf("%d\n", ans);
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:15:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &m);
                       ^
./Main.cpp:16:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  For(i, 1, m) scanf("%d%d", &X[i], &Y[i]);
                                          ^

Judge Result