Submission #865690

#	Time	Username	Problem	Language	Result	Execution time	Memory
865690		Rifal	Newspapers (CEOI21_newspapers)	C++14	4 / 100	1 ms	700 KiB

newspapers

#include <bits/stdc++.h>
#include <fstream>
//#define endl '\n'
#define mod 1000000007
#define INF 9000000000000000
using namespace std;
const int Max = 1e4;
vector<int> v[Max];
bool ok[Max];
void dfs(int s, int p) {
    ok[s] = 1;
    for(auto i : v[s]) {
        if(i != p) {
            if(ok[i] == 1) {
                cout << "NO";
                exit(0);
            }
            dfs(i,s);
        }
    }
}
int main()
{
    ios_base::sync_with_stdio(0);cout.tie(0);cin.tie(0);
    int n, m; cin >> n >> m;
    for(int i = 0; i < m; i++) {
        int a, b; cin >> a >> b;
        v[a].push_back(b);
        v[b].push_back(a);
    }
    dfs(1,0);
    cout << "YES" << endl << '1' << endl << '1' << ' ';
    return 0;
}

• Subtask 1: 0 / 12
• Subtask 2: 4 / 8
• Subtask 3: 0 / 80