func_code_string: #include <bits/stdc++.h>   using namespace std;   long long a[5000];   int main() {     int t;     cin >> t;     while (t--) {       long long a, b, c, d;       cin >> a >> b >> c >> d;       long long p1 = b * c, p2 = (a - c - 1) * b, p3 = a * d,                 p4 = a * (b - d - 1);       cout << max(max(p1, p2), max(p3, p4)) << endl;     }   }   