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temporary.cpp
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temporary.cpp
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#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define endl '\n'
#define FOR(i,a,b) for(int i = a; i < b; ++i)
#define readInt(x) int x; cin >> x; // reads int
#define readll(x) ll x; cin >> x; // reads long long
#define readStr(x) string x; cin >> x; // reads string(word)
#define readLine(x) string x; getline(cin, x); // reads string(sentence)
#define print(x) cout<<(x)<<" "
#define println(x) cout<<(x)<<endl
void solve(){
// start
readInt(n)readInt(m);
readInt(x)readInt(y);
int left = (y>1?(y-1)*n : 0);
int right = (y < m?(m-y)*n : 0);
int top = (x>1?(x-1)*m : 0);
int down = (x < n?(n-x)*m : 0);
// cout << left << " " << right << " " << top << " " << down << endl;
cout << max(left, max(right, max(top, down))) << endl;
}
int main(){
int testcases = 1;
cin >> testcases;
while(testcases--){
solve();
}
return 0;
}