Submission #1191222

#	Time	Username	Problem	Language	Result	Execution time	Memory
1191222		Gray	Newspapers (CEOI21_newspapers)	C++20	4 / 100	0 ms	328 KiB

newspapers

#include <algorithm>
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long
#define ld long double
#define ff first
#define ss second
#define ln "\n"
#define mp make_pair
#define pb push_back
#define INF (ll)1e18
ll MOD = (ll)(1e9+7);

void dfs(ll u, ll p, vector<vector<ll>> &A, ll &cnt){
    if (A[u].size()==1) cnt++;
    for (auto v:A[u]){
        if (v==p) continue;
        dfs(v, u, A, cnt);
    }
}

void solve(){
    ll n, m; cin >> n >> m;
    vector<vector<ll>> A(n+1);
    for (ll i=0; i<m; i++){
        ll u, v; cin >> u >> v;
        A[u].push_back(v); A[v].push_back(u);
    }
    ll cnt=0; dfs(1, 1, A, cnt);
    if (cnt>2 or m>=n){
        cout << "NO\n";
    }else{
        cout << "YES\n";
    }
    cout << 1 << ln << 1 << ln; return;
    if (n==1){
        cout << "YES\n1\n1\n"; return;
    }else if (n==2){
        ll _; cin >> _ >> _;
        cout << "YES\n2\n1 1\n"; return;
    }
    for (ll i=0; i<m; i++){
        ll u, v; cin >> u >> v;
    }
    cout << "YES" << ln;
    cout << n*2-2 << ln;
    for (ll i=2; i<=n; i++){
        cout << i << ' ';
    }
    for (ll i=n; i>=2; i--){
        cout << i << ' ';
    }
    cout << ln;
}

int main(){
    ios_base::sync_with_stdio(false); cin.tie(nullptr);
    #ifdef LOCAL
    auto start = chrono::high_resolution_clock::now();
    #endif
    ll testc=1;
    // cin >> testc;
    for (ll __c=1; __c<=testc; __c++) solve();
    #ifdef LOCAL
    auto duration = chrono::duration_cast<chrono::microseconds>(chrono::high_resolution_clock::now() - start);
    cout << setprecision(0) << fixed << "time: " << (double)duration.count()/1000.0 << " milliseconds" << endl;
    #endif
}

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