func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 310;   long long xh, yh, xu, yu;   int n;   long long a[N], b[N], c[N];   int main() {     scanf( %I64d%I64d , &xh, &yh);     scanf( %I64d%I64d , &xu, &yu);     scanf( %d , &n);     for (int i = 0; i < n; ++i) {       scanf( %I64d%I64d%I64d , a + i, b + i, c + i);     }     int cnt = 0;     for (int i = 0; i < n; ++i) {       if (a[i] * xu + b[i] * yu + c[i] < 0 && a[i] * xh + b[i] * yh + c[i] > 0) {         ++cnt;       } else if (a[i] * xu + b[i] * yu + c[i] > 0 &&                  a[i] * xh + b[i] * yh + c[i] < 0) {         ++cnt;       }     }     printf( %d n , cnt);     return 0;   }   