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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. typedef long long ll;
  4. int main() {
  5.     ios_base::sync_with_stdio(false);
  6.     cin.tie(NULL);
  7.     int t;
  8.     cin>>t;
  9.     while(t--) {
  10.         ll n;
  11.         cin>>n;
  12.         vector<int> l(n), r(n);
  13.         vector<pair<int, int> > v;
  14.  
  15.         for (int i=0;i<n;i++){
  16.             int x;
  17.             cin>>l[i]>>r[i];
  18.             cin>>x;
  19.             v.push_back({x,i});
  20.         }
  21.         sort(v.begin(), v.end());
  22.     // sort acc to l[i] for each grp;
  23.         int i=0;
  24.         bool flag = false;
  25.         while(i<n){
  26.             vector<pair<int,int> > vec;
  27.             vec.push_back({l[v[i].second], r[v[i].second]});
  28.             for(int j=i+1;j<n;j++){
  29.                 if(v[i].first == v[j].first){
  30.                     vec.push_back({l[v[j].second], r[v[j].second]});
  31.                 }
  32.                 else break;
  33.             }
  34.             sort(vec.begin(), vec.end());
  35.             int sz = vec.size();
  36.             for(int j = 0;j<sz-1;j++){
  37.                 int ac=0;
  38.                 for(int z = j+1;z<sz;z++){
  39.                     if(vec[j].second >= vec[z].first) ac++;
  40.                 }
  41.                 if(ac>=2){
  42.                     flag = true;
  43.                     break;
  44.                 }
  45.             }
  46.             i += sz;
  47.             if(flag == true) break;
  48.  
  49.         }
  50.         if(flag ==true ){
  51.             cout<<"NO"<<endl;
  52.         }
  53.         else{
  54.             cout<<"YES"<<endl;
  55.         }
  56.     }
  57.     return 0;
  58. }
Success #stdin #stdout 0s 4176KB
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stdout
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YES
https://ideone.com/ImHwvJ
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
secret

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