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  1. #include <bits/stdc++.h>
  2. #pragma GCC optimize("O3,unroll-loops")
  3. #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
  4. using namespace std;
  5.  
  6. int n;
  7. int x[1010], y[1010];
  8.  
  9. long double Area(int i, int j, int k){
  10.          x[j] -= x[i];
  11.          y[j] -= y[i];
  12.          x[k] -= x[i];
  13.          y[k] -= y[i];
  14.  
  15.          long long cross= x[j] * 1LL * y[k] - x[k] * 1LL * y[j];
  16.          x[j] += x[i];
  17.          y[j] += y[i];
  18.          x[k] += x[i];
  19.          y[k] += y[i];
  20.          return abs(cross);
  21. }
  22. bool check(int i, int j, int k){
  23.          long long dot=
  24.                   (x[j] - x[i]) * 1LL * (x[k] - x[i]) +
  25.                   (y[j] - y[i]) * 1LL * (y[k] - y[i]);
  26.  
  27.          return dot == 0;
  28. }
  29. bool checkRightAngle(int i, int j, int k){
  30.          return check(i, j, k) || check(j, i, k) || check(k, i, j);
  31. }
  32. void solve(){
  33.          long long L, R;
  34.          cin>>n>>L>>R;
  35.          for(int i = 0; i< n; i++){
  36.                   cin>>x[i]>>y[i];
  37.          }
  38.          int ans= 0;
  39.          for(int i = 0; i < n; i++){
  40.                   for(int j = i + 1; j < n; j++){
  41.                            for(int k = j + 1; k < n; k++){
  42.                                     if(checkRightAngle(i, j, k)){
  43.                                              long long area= Area(i, j, k);
  44.                                              ans += (L * 2LL <= area && area <= 2LL * R);
  45.                                     }
  46.                            }
  47.                   }
  48.          }
  49.          cout<<ans<<"\n";
  50. }
  51. ::int32_t main() {
  52.          cin.tie(0);
  53.          cin.sync_with_stdio(0);
  54.          ::freopen("points.in", "r", stdin);
  55.  
  56.          int T; cin>>T;
  57.          while(T--) solve();
  58. }
Success #stdin #stdout 0.01s 5316KB
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https://ideone.com/N9D3Lj
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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