Submission #991869

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Source Code Expand

#include <iostream>
#include <vector>
#include <cstdio>
#include <algorithm>
#include <set>
#include <map>
#include <cassert>
#include <numeric>
#include <string>
#include <cstring>
#include <cmath>
using namespace std;

#ifdef LOCAL
	#define eprintf(...) fprintf(stderr, __VA_ARGS__)
#else
	#define eprintf(...) 42
#endif

typedef long long int int64;


const int N = (int) 2e5 + 100;
vector <int> g[N];
bool used[N];

void dfs(int v)
{
	used[v] = true;
	for (int to : g[v] )
	{
		if (used[to] ) continue;
		dfs(to);
	}
}


int main(int,  char **)
{
#ifdef LOCAL
//	freopen("input.txt", "r", stdin);
//	freopen("output.txt", "w", stdout);
#endif


	int n, m;
	scanf("%d%d", &n, &m);

	for (int i = 0; i < n; i++)
	{
		int k;
		scanf("%d", &k);
		for (int j = 0; j < k; j++)
		{
			int x;
			scanf("%d", &x);
			x--;
			g[x + n].push_back(i);
			g[i].push_back(x + n);
		}
	}
	dfs(0);
	for (int i = 0; i < n; i++)
		if (!used[i] )
		{
			printf("NO\n");
			return 0;
		}
	printf("YES\n");



	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main(int, char**)’:
./Main.cpp:47:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &m);
                       ^
./Main.cpp:52:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &k);
                  ^
./Main.cpp:56:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &x);
                   ^

Judge Result