Submission #992161

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Source Code Expand

#include <iostream>
#include <fstream>
#include <cstdio>
#include <cmath>
#include <vector>
#include <cstring>
#include <string>
#include <set>
#include <map>
#include <stack>
#include <queue>
#include <algorithm>
using namespace std;
 
#define REP(i,n) for(int i=0; i<n; ++i)
#define FOR(i,a,b) for(int i=a; i<=b; ++i)
#define FORR(i,a,b) for (int i=a; i>=b; --i)
#define pi M_PI
 
typedef long long ll;
typedef vector<int> VI;
typedef vector<ll> VL;
typedef vector<VI> VVI;
typedef pair<int,int> P;
typedef pair<ll,ll> PL;

const int N = 100000;
VI e[2*N];
int f[2*N];

void dfs(int now){
    f[now] = 1;
    REP(i,e[now].size()){
        int next = e[now][i];
        if (f[next]) continue;
        dfs(next);
    }
}

int main() {
    int n, m;
    cin >> n >> m;
    REP(i,n){
        int k;
        cin >> k;
        while(k--){
            int l;
            scanf("%d", &l);
            e[i].push_back(l+N);
            e[l+N].push_back(i);
        }
    }

    dfs(0);

    bool ok = 1;
    REP(i,n){
        if (!f[i]) ok = 0;
    }

    cout << (ok ? "YES" : "NO") << endl;

    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:48:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d", &l);
                            ^

Judge Result