Submission #1094614

#	Time	Username	Problem	Language	Result	Execution time	Memory
1094614		Roumak77	Curtains (NOI23_curtains)	C++17	0 / 100	3 ms	2140 KiB

curtains

#pragma GCC optimize ("O3")
#pragma GCC optimize ("unroll-loops")
#pragma GCC optimize("-Ofast")
#include <bits/stdc++.h>
#include <algorithm>
#include <iostream>
#include <vector>
#include <limits>
#include <cmath>
#include <stack>
#include <queue>
#include <map>
#include <math.h>
using namespace std;

using ll = long long;


ll recur(ll curr, vector<bool> &vis, vector<vector<ll>> &adj){

    vis[curr] = true;
    ll total = 1;
    for(ll node : adj[curr]){
        if(!vis[node]){
            total += recur(node, vis, adj);
        }
    }
    return total;

}

void solve(){

    ll n, m;
    cin >> n >> m;

    vector<vector<ll>> adj(n, vector<ll>());
    for(ll i = 0; i < m; i++){
        ll a, b;
        cin >> a >> b;
        a--; b--;

        adj[a].push_back(b);
        adj[b].push_back(a);
    }

    vector<bool> main_vis(n, false);
    vector<bool> temp(n, false);

    for(ll i = 0; i < n; i++){
        temp = main_vis;
        ll curr = 0;
        for(ll j = 0; j < n; j++){
            if(!main_vis[j]){
                curr = j;
                break;
            }
        }

        if(recur(curr, temp, adj) == n - i){
            cout << "YES" << endl;
        }else{
            cout << "NO" << endl;
        }

        ll k;
        cin >> k;
        k--;
        main_vis[k] = true;
    }


}

bool single = true;

int main(){


    freopen("closing.in", "r", stdin);
    freopen("closing.out", "w", stdout);
    ios_base::sync_with_stdio(false);
    cout.tie(0);
    cin.tie(0);

    ll t = 1;
    if(!single) cin >> t;

    while(t--){
        solve();
    }
}

Compilation message (stderr)

curtains.cpp: In function 'int main()':
curtains.cpp:80:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |     freopen("closing.in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
curtains.cpp:81:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   81 |     freopen("closing.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 3
• Subtask 2: 0 / 6
• Subtask 3: 0 / 15
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36
• Subtask 6: 0 / 20