Submission #892364

#	Time	Username	Problem	Language	Result	Execution time	Memory
892364		Pannda	Newspapers (CEOI21_newspapers)	C++17	Compilation error	0 ms	0 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;
    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";
    } else {
        if (cnt3 >= 2) {
            cout << "NO\n";
            return 0;
        }
        if (cnt2 >= 2) {
            cout << "YES\n";
            return 0;
        } else {
            cout << "NO\n";
            return 0;
        }
    }
}

Compilation message (stderr)

newspapers.cpp: In function 'int main()':
newspapers.cpp:32:13: error: 'cnt2' was not declared in this scope; did you mean 'cnt3'?
   32 |             cnt2++;
      |             ^~~~
      |             cnt3
newspapers.cpp:43:13: error: 'cnt2' was not declared in this scope; did you mean 'cnt3'?
   43 |         if (cnt2 >= 2) {
      |             ^~~~
      |             cnt3