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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4.  
  5. int main() {
  6.     int n;
  7.     cin >> n;
  8.  
  9.     int X[2000], Y[2000];
  10.     int x_Count = 0, y_Count = 0;
  11.  
  12.     for (int i = 0; i < n; i++) {
  13.         int x, y;
  14.         cin >> x >> y;
  15.         if (y == 0) {
  16.             X[x_Count++] = abs(x);
  17.         } else {
  18.             Y[y_Count++] = abs(y);
  19.         }
  20.     }
  21.  
  22.     int count = 0;
  23.  
  24.     for (int i = 0; i < x_Count; i++) {
  25.         for (int j = i + 1; j < x_Count; j++) {
  26.             int prod_x = X[i] * X[j];
  27.  
  28.             for (int k = 0; k < y_Count; k++) {
  29.                 for (int l = k + 1; l < y_Count; l++) {
  30.                     int prod_y = Y[k] * Y[l];
  31.                     if (prod_x == prod_y) {
  32.                         count++;
  33.                     }
  34.                 }
  35.             }
  36.         }
  37.     }
  38.  
  39.     cout << count << "\n";
  40.  
  41.     return 0;
  42. }
  43.  
Success #stdin #stdout 0.01s 5288KB
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stdin
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10
1 0
3 0
5 0
0 7
0 2
0 4
0 5
2 0
9 0
0 6
stdout
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1
https://ideone.com/qkuZu4
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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