func_code_string: #include <bits/stdc++.h>   using namespace std;   const int mod = 1000000007;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     long long int q, n, i, j, k, t;     long long int a[3];     cin >> t;     long long int area[5];     while (t--) {       long long int a, b, x, y;       cin >> a >> b >> x >> y;       area[1] = (b - y - 1) * a;       area[2] = (y)*a;       area[3] = (a - x - 1) * b;       area[4] = (x)*b;       long long int ans = -1;       for (i = 1; i <= 4; i++) {         ans = max(ans, area[i]);       }       cout << ans <<   n ;     }     return 0;   }   