func_code_string: #include <bits/stdc++.h>   using namespace std;   void print_ans(int x1, int y1, int x2, int y2) {     long long int ans;     ans = (x1 - x2) * (y1 - y2);     if (ans < 0) ans = -ans;     cout << ans;     return;   }   int main() {     int n, x[4], y[4], i;     cin >> n;     if (n < 2)       cout <<  -1 ;     else {       for (i = 0; i < n; i++) cin >> x[i] >> y[i];       if (n == 2) {         if (x[0] == x[1] || y[0] == y[1])           cout <<  -1 ;         else           print_ans(x[0], y[0], x[1], y[1]);       } else {         if (x[0] != x[1] && y[0] != y[1])           print_ans(x[0], y[0], x[1], y[1]);         else if (x[1] != x[2] && y[1] != y[2])           print_ans(x[1], y[1], x[2], y[2]);         else           print_ans(x[0], y[0], x[2], y[2]);       }     }     return 0;   }   