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  1. #pragma GCC optimize("Ofast")
  2. #pragma GCC target("avx,avx2,fma")
  3. #include<bits/stdc++.h>
  4. using namespace std;
  5. typedef long long int ll;
  6. int main(){
  7.     ios_base::sync_with_stdio(false);
  8.     cin.tie(0);cout.tie(0);
  9.     int t;
  10.     cin>>t;
  11.     while(t--){
  12.         ll n, i, j;
  13.         cin >> n;
  14.         vector<pair<ll,ll> > arr(n);
  15.         pair<ll,ll> first, last;
  16.         map<ll,map<ll,ll> > m1;
  17.         for(i = 0; i < n; i++){
  18.             cin >> arr[i].first >> arr[i].second;
  19.             m1[arr[i].first][arr[i].second] = 1;
  20.             if(arr[i].first == 1){
  21.                 first = {arr[i].first, arr[i].second};
  22.             }
  23.             else if(arr[i].second == n){
  24.                 last = {arr[i].first, arr[i].second};
  25.             }
  26.         }
  27.         ll x, y;
  28.         x = first.first; y = first.second;
  29.         bool ok = false;
  30.         while(y >= 1){
  31.             if(m1[x][y] == 0){
  32.                 ok = true;
  33.                 break;
  34.             }
  35.             x += 1;
  36.             y -= 1;
  37.         }
  38.         if(!ok){
  39.             cout << "NO" << endl;
  40.             continue;
  41.         }
  42.         x = last.first; y = last.second;
  43.         while(x <= n){
  44.             if(m1[x][y] == 0){
  45.                 ok = true;
  46.                 break;
  47.             }
  48.             x += 1;
  49.             y -= 1;
  50.         }
  51.         if(!ok)
  52.             cout << "NO" << endl;
  53.         else
  54.             cout << "YES" << endl;
  55.     }
  56.     return 0;
  57. }
  58.  
  59.  
Runtime error #stdin #stdout #stderr 0s 5624KB
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Standard input is empty
stdout
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Standard output is empty
stderr
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terminate called after throwing an instance of 'std::bad_alloc'
  what():  std::bad_alloc
https://ideone.com/rnvu9l
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
secret

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