func_code_string: #include <bits/stdc++.h>   using namespace std;   inline int read() {     int x = 0, f = 1;     char ch = getchar();     while (ch <  0  || ch >  9 ) {       if (ch ==  - ) f = -1;       ch = getchar();     }     while (ch >=  0  && ch <=  9 ) {       x = (x << 1) + (x << 3) + (ch ^ 48);       ch = getchar();     }     return x * f;   }   const int N = 1e3 + 5;   int f[N][N];   struct node {     long long x, y;   } a[N], b[N];   bool cmp(node x, node y) { return x.y < y.y; }   long long area(node a, node b, node c) {     return a.x * b.y - a.y * b.x + b.x * c.y - b.y * c.x + c.x * a.y - c.y * a.x;   }   bool toleft(node a, node b, node c) {     if (c.y <= a.y || c.y > b.y) return 0;     return area(a, b, c) > 0;   }   int n, m;   int main() {     cin >> n >> m;     for (int i = 1; i <= n; ++i) scanf( %lld%lld , &a[i].x, &a[i].y);     for (int i = 1; i <= m; ++i) scanf( %lld%lld , &b[i].x, &b[i].y);     sort(a + 1, a + n + 1, cmp);     int ans = 0;     for (int i = 1; i < n; ++i)       for (int j = i + 1; j <= n; ++j)         for (int k = 1; k <= m; ++k)           if (toleft(a[i], a[j], b[k])) f[i][j]++;     for (int i = 1; i < n; ++i)       for (int j = i + 1; j < n; ++j)         for (int k = j + 1; k <= n; ++k)           if (f[i][j] + f[j][k] == f[i][k]) ans++;     printf( %d n , ans);     return 0;   }   