Submission #1770328

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Source Code Expand

#include <stdio.h>

int n;
int adj[8][8];
int visited[8];

int dfs(int cur, int num) {
	if (num == n)
		return 1;

	visited[cur] = 1;

	int sum = 0;
	for (int i = 0; i < n; i++)
		if (adj[cur][i] && !visited[i])
			sum += dfs(i, num + 1);

	visited[cur] = 0;

	return sum;
}

int main(void) {
	int m;

	scanf("%d %d", &n, &m);
	for (int i = 0; i < m; i++) {
		int a, b;
		scanf("%d %d", &a, &b);
		a--; b--;
		adj[a][b] = adj[b][a] = 1;
	}

	printf("%d\n", dfs(0, 1));

	return 0;
}

Submission Info

Compile Error

./Main.c: In function ‘main’:
./Main.c:26:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &m);
  ^
./Main.c:29:3: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &a, &b);
   ^

Judge Result