Submission #992655

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Source Code Expand

#include <algorithm>
#include <iostream>
#include <cstdio>
#include <vector>
#include <memory.h>
using namespace std;

const int maxn = 1e5 + 10;
vector<int> G[maxn];
bool vis[maxn];
void dfs(int u, int& cnt)
{
	cnt++;
	vis[u] = 1;
	for(int i=0; i<(int)G[u].size(); i++)
	{
		if(!vis[G[u][i]]) dfs(G[u][i], cnt);
	}
}

int main()
{
	int n, m, k;
	while(cin>>n>>m)
	{
		vector<vector<int> > l(m+1);
		for(int i=1; i<=n; i++) G[i].clear();
		memset(vis, 0, sizeof(vis));
		for(int i=1; i<=n; i++)
		{
			scanf("%d", &k);
			while(k--)
			{
				int x;
				scanf("%d", &x);
				l[x].push_back(i);
			}
		}
		for(int i=1; i<=m; i++)
		{
			for(int j=1; j<(int)l[i].size(); j++)
			{
				G[l[i][j]].push_back(l[i][j-1]);
				G[l[i][j-1]].push_back(l[i][j]);
			}
		}
		int cnt = 0;
		dfs(1, cnt);
		cout<<((cnt == n) ? "YES" : "NO")<<endl;
	}
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:31:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &k);
                   ^
./Main.cpp:35:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &x);
                    ^

Judge Result