func_code_string: #include <bits/stdc++.h>   using namespace std;   int x, a, b, mx = 2500, Mx = -2500, my = 2500, My = -2500, ans;   int main() {     cin >> x;     for (int i = 1; i <= x; i++) {       cin >> a >> b;       mx = min(mx, a);       Mx = max(Mx, a);       my = min(my, b);       My = max(My, b);     }     if (x == 1 || mx == Mx || my == My) {       cout << -1 << endl;     } else {       ans = (Mx - mx) * (My - my);       cout << ans << endl;     }   }   