Submission #536320

#	Time	Username	Problem	Language	Result	Execution time	Memory
536320		rainboy	우호 조약 체결 (JOI14_friends)	C11	5 / 100	4 ms	932 KiB

friends

#include <stdio.h>

#define N	100

char adj[N][N]; int n, cnt;

void solve(int i, int j) {
	int k;

	if (adj[i][j] != 1)
		return;
	adj[i][j] = -1, cnt++;
	for (k = 0; k < n; k++)
		if (k != i && k != j && adj[i][k]) {
			if (!adj[j][k])
				adj[j][k] = 1, solve(j, k);
			if (!adj[k][j])
				adj[k][j] = 1, solve(k, j);
		}
}

int main() {
	int m, i, j;

	scanf("%d%d", &n, &m);
	while (m--) {
		scanf("%d%d", &i, &j), i--, j--;
		adj[i][j] = 1;
	}
	for (i = 0; i < n; i++)
		for (j = 0; j < n; j++)
			solve(i, j);
	printf("%d\n", cnt);
	return 0;
}

Compilation message (stderr)

friends.c: In function 'main':
friends.c:25:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |  scanf("%d%d", &n, &m);
      |  ^~~~~~~~~~~~~~~~~~~~~
friends.c:27:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |   scanf("%d%d", &i, &j), i--, j--;
      |   ^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 30
• Subtask 3: 0 / 65