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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int n;
  6.     cin >> n;
  7.     int X[2000], Y[2000];
  8.     for (int i = 0; i < n; i++){
  9.         cin >> X[i] >> Y[i];
  10.     }
  11.     int x[2000] = {0};
  12.     int y[2000] = {0};
  13.     for (int i = 0; i < n; i++){
  14.     	if (Y[i] == 0)x[i] = X[i];
  15.     	else y[i] = Y[i];	
  16.     }
  17.     int X_2[2000][2000];
  18.     int Y_2[2000][2000];
  19.  
  20.     for (int j = 0; j < n; j++){
  21.         for (int k = 0; k < n; k++){
  22.             X_2[j][k] = x[j] * x[k];
  23.             Y_2[j][k] = y[j] * y[k];
  24.         }
  25.     }
  26.  
  27.     int counter = 0;
  28.     for (int j = 0; j < n; j++){
  29.         for (int k = 0; k < n; k++){
  30.             if (X_2[j][k] == Y_2[j][k]) {
  31.                 counter++;
  32.             }
  33.         }
  34.     }
  35.  
  36.     cout << counter << "\n";
  37.     return 0;
  38. }
  39.  
Success #stdin #stdout 0.01s 5584KB
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https://ideone.com/PaYKuv
language:
C++ (gcc 8.3)
created:
9 hours ago
visibility:
public

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