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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4. int main() {
  5.     long long x1, y1, x2, y2;
  6.     cin >> x1 >> y1 >> x2 >> y2;
  7.     int n;
  8.     cin >> n;
  9.     int brojac = 0;
  10.     long long dx_prava = x2 - x1;
  11.     long long dy_prava = y2 - y1;
  12.  
  13.     for (int i = 0; i < n; i++) {
  14.         long long x, y;
  15.         cin >> x >> y;
  16.         long long dx_tacka = x - x1;
  17.         long long dy_tacka = y - y1;
  18.         if (dy_tacka * dx_prava == dy_prava * dx_tacka) {
  19.             brojac++;
  20.         }
  21.     }
  22.     cout << brojac << endl;
  23.  
  24.     return 0;
  25. }
Success #stdin #stdout 0s 5316KB
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https://ideone.com/pkCPnn
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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