func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     int T = 1;     cin >> T;     while (T--) {       int64_t w, h;       cin >> w >> h;       vector<int64_t> hor1, hor2, ver1, ver2;       int64_t k;       int64_t q;       cin >> k;       for (int i = 0; i < k; ++i) cin >> q, hor1.push_back(q);       cin >> k;       for (int i = 0; i < k; ++i) cin >> q, hor2.push_back(q);       cin >> k;       for (int i = 0; i < k; ++i) cin >> q, ver1.push_back(q);       cin >> k;       for (int i = 0; i < k; ++i) cin >> q, ver2.push_back(q);       cout << max({(hor1.back() - hor1[0]) * h, (hor2.back() - hor2[0]) * h,                    (ver1.back() - ver1[0]) * w, (ver2.back() - ver2[0]) * w})            <<   n ;     }   }   