Submission #957208

#	Time	Username	Problem	Language	Result	Execution time	Memory
957208		LucaIlie	Newspapers (CEOI21_newspapers)	C++17	4 / 100	1 ms	468 KiB

newspapers

#include <bits/stdc++.h>

using namespace std;

const int MAX_N = 1e3;
bool vis[MAX_N + 1], side[MAX_N + 1];
vector<int> adj[MAX_N + 1];

bool checkBipartite( int u ) {
    vis[u] = true;
    bool ok = true;
    for ( int v: adj[u] ) {
        if ( !vis[v] ) {
            side[v] = side[u] ^ 1;
            ok &= checkBipartite( v );
        } else if ( side[v] == side[u] )
            ok = false;
    }

    return ok;
}

int main() {
    int n, m;

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

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

    cout << "YES\n";
    if ( n <= 2 ) {
        cout << n << "\n";
        for ( int i = 1; i <= n; i++ )
            cout << i << " ";
    } else {
        cout << 2 * n - 4 << "\n";
        for ( int i = 2; i <= n - 1; i++ )
            cout << i << " ";
        for ( int i = n - 1; i >= 2; i-- )
            cout << i << " ";
    }
    
    return 0;
}

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