Submission #685918

#	Time	Username	Problem	Language	Result	Execution time	Memory
685918		Alihan_8	Trampoline (info1cup20_trampoline)	C++17	100 / 100	774 ms	78352 KiB

trampoline

#include <bits/stdc++.h>
// include <ext/pb_ds/assoc_container.hpp>
// include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
using namespace std;
#define all(x) x.begin(), x.end()
#define pb push_back
// define ordered_set tree<int,null_type,less_equal<int>,rb_tree_tag,tree_order_statistics_node_update>
#define mpr make pair
#define ln '\n'
void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
#define int long long
const int N = 2e5+1;
int lift[20][N];
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int r, c, n; cin >> r >> c >> n;
    map <int,set<pair<int,int>>> st;
    vector <pair<int,int>> p(n);
    for ( int i = 0; i < n; i++ ){
        int x, y; cin >> x >> y;
        st[--x].insert({--y, i+1});
        p[i] = {x, y};
    }
    for ( int i = 0; i < n; i++ ){
        auto [x, y] = p[i];
        if ( !st.count(x+1) ) continue;
        auto it = st[x+1].lower_bound({y, 0});
        if ( it == st[x+1].end() ) continue;
        lift[0][i+1] = it->second;
    }
    for ( int i = 1; i < 20; i++ ){
        for ( int j = 1; j <= n; j++ ){
            lift[i][j] = lift[i-1][lift[i-1][j]];
        }
    }
    auto get = [&](int x, int k){
        for ( int i = 19; i >= 0; i-- ){
            if ( k >> i & 1 ) x = lift[i][x];
        }
        return x;
    };
    int t; cin >> t;
    while ( t-- ){
        int xs, ys, xe, ye;
        cin >> xs >> ys >> xe >> ye;
        if ( xs > xe or ys > ye or xe-xs > n ){
            cout << "No\n";
            continue;
        }
        if ( xs == xe ){
            cout << "Yes\n";
            continue;
        }
        xs--, xe--, ys--, ye--;
        if ( !st.count(xs) ){
            cout << "No\n";
            continue;
        }
        auto it = st[xs].lower_bound({ys, 0});
        if ( it == st[xs].end() ){
            cout << "No\n";
            continue;
        }
        int k = it->second, par = xe-xs-1;
        k = get(k, par);
        if ( !k or p[k-1].second > ye ) cout << "No\n";
        else cout << "Yes\n";
    }

    cout << '\n';
}

Compilation message (stderr)

trampoline.cpp: In function 'void IO(std::string)':
trampoline.cpp:11:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
trampoline.cpp:11:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                                                               ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 23 / 23
• Subtask 2: 20 / 20
• Subtask 3: 11 / 11
• Subtask 4: 19 / 19
• Subtask 5: 27 / 27