Submission #1135926

#	Time	Username	Problem	Language	Result	Execution time	Memory
1135926		agrim_09	Curtains (NOI23_curtains)	C++20	0 / 100	9 ms	12616 KiB

curtains

// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
template <class T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define endl '\n';
#define fastio ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define py cout << "YES" << endl;
#define pn cout << "NO" << endl;
#define pb push_back
#define int long long
typedef long double lld;
#define double lld
typedef long long ll;
typedef unsigned long long ull;
const ll inf = 1e18;
const ll mod = 1e9+7;
const int N = 2e5;
vector<int>primes = {2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97};

// Check for queue, priorioty_queue, stack, ordered_set solutions
// stack => LIFO (whatever goes in last comes out last)
// queue => FIFO (whatever goes in first comes out first)
// priority_queue => Dynamic queries of minimum/maximum
// ordered_set => set in vector form
//[order_of_key(k) gives number of elements less than k, while find_by_order(i) gives i^th element]

// To comment multiple lines : ctrl + /
// To find and replace : ctrl+H

void judge(){
    srand(time(NULL));
    #ifndef ONLINE_JUDGE
    freopen("1.txt","r",stdin);
    freopen("2.txt","w",stdout);
    freopen("Error.txt", "w", stderr);
    #define debug(x...) cerr << #x <<" = "; _print(x); cerr << endl;
    #else
    #define debug(x...)
    #endif
}

void usaco(string s) {
    freopen((s + ".in").c_str(),"r",stdin);
    freopen((s + ".out").c_str(),"w",stdout);
}
vector<vector<int>>adj; vector<bool>done; int n;

void dfs(int node, vector<bitset<500000>>&vis){
    if(done[node]){
        return;
    }
    // vis[node] |= vis[node+1];
    for(auto child : adj[node]){
        vis[node][child] = true;
        //cout << child << endl;
        if(child!=node){
            dfs(child,vis);
        }
        if(child!=n-1){
            dfs(child+1,vis);
            vis[node] |= vis[child+1];
        }
        vis[node] |= vis[child];
    }
    done[node] = true;
}

signed main(){
    fastio; //judge();
    int m,q; cin >> n >> m >> q;
    adj.resize(n);
    vector<bitset<500000>>vis(n);
    done.resize(n);
    for(int i = 0,u,v;i<m;i++){
        cin >> u >> v; u--; v--;
        adj[u].pb(v);
    }
    //py;
    for(int i = 0;i<n;i++){
        dfs(i,vis);
    }

    // for(int i = 0;i<n;i++){
    //     for(int j = 0;j<n;j++){
    //         cout << vis[i][j];
    //     }
    //     cout << endl;
    // }

    while(q--){
        int s,e; cin >> s >> e; s--; e--;
        if(vis[s][e]){
            py;
        }
        else{
            pn;
        }
    }

}

Compilation message (stderr)

curtains.cpp: In function 'void judge()':
curtains.cpp:37:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |     freopen("1.txt","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~
curtains.cpp:38:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |     freopen("2.txt","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~
curtains.cpp:39:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |     freopen("Error.txt", "w", stderr);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
curtains.cpp: In function 'void usaco(std::string)':
curtains.cpp:47:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |     freopen((s + ".in").c_str(),"r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
curtains.cpp:48:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |     freopen((s + ".out").c_str(),"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