Submission #685048

#	Time	Username	Problem	Language	Result	Execution time	Memory
685048		moonhero	Newspapers (CEOI21_newspapers)	C++14	4 / 100	1 ms	340 KiB

newspapers

#include<bits/stdc++.h>
using namespace std;
using ll = long long;

vector <int> g[1005];
bool used[1005], ok = 1;

void dfs (int v, int pr = -1) {
    used[v] = 1;
    for (auto it : g[v]) {
        if (!used[it]) dfs(it, v);
        else if (it != pr) {
            cout << "NO\n";
            exit(0);
        }
    }
}

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n, m; cin >> n >> m;
    for (int i = 1; i <= m; i++) {
        int u, v; cin >> u >> v;
        g[u].push_back(v);
        g[v].push_back(u);
    } dfs(1);
    cout << "YES\n1\n1";
    return 0;
}

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