Submission #892372

#	Time	Username	Problem	Language	Result	Execution time	Memory
892372		Pannda	Newspapers (CEOI21_newspapers)	C++17	4 / 100	1 ms	600 KiB

newspapers

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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n, m;
    cin >> n >> m;

    vector<vector<int>> adj(n);
    for (int i = 0; i < m; i++) {
        int u, v;
        cin >> u >> v;
        u--;
        v--;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }

    if (m != n - 1) {
        cout << "NO\n";
        return 0;
    }

    int cnt3 = 0;
    int cnt2 = 0;
    for (int u = 0; u < n; u++) {
        if (adj[u].size() >= 3) {
            cnt3++;
        }
        if (adj[u].size() == 2) {
            cnt2++;
        }
    }

    if (cnt3 == 0) {
        cout << "YES\n";
        cout << "1\n1\n";
    } else {
        if (cnt3 >= 2) {
            cout << "NO\n";
            return 0;
        }
        if (cnt2 >= 2) {
            cout << "NO\n";
            return 0;
        } else {
            cout << "YES\n";
            cout << "1\n1\n";
            return 0;
        }
    }
}

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