Submission #3005038

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

int n,m; bitset<400> S[400];
int x[200005], y[200005];
bool no[200005];

int main() {
	scanf("%d%d", &n, &m);
	for (int i=0; i<n; i++) S[i][i] = 1;
	for (int i=0; i<m; i++) scanf("%d%d", &x[i], &y[i]), --x[i], --y[i];
	for (int i=m-1; i>=0; i--) {
		for (int j=0; j<n; j++) {
			if (S[j][x[i]] && S[j][y[i]]) no[j] = 1;
			else if (S[j][x[i]]) S[j][y[i]] = 1;
			else if (S[j][y[i]]) S[j][x[i]] = 1;
		}
	}
	int ans = 0;
	for (int i=0; i<n-1; i++)
		for (int j=i+1; j<n; j++)
			if (!no[i] && !no[j] && !(S[i] & S[j]).count()) {
				++ans;
			}
	printf("%d\n", ans);
	return 0;
}
 

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:9:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &m);
                       ^
./Main.cpp:11:69: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  for (int i=0; i<m; i++) scanf("%d%d", &x[i], &y[i]), --x[i], --y[i];
                                                                     ^

Judge Result