#include<bits/stdc++.h>
using namespace std;

#define pb push_back
#define mp make_pair
#define ALL(x) (x).begin(),(x).end()
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> pii;
const int maxn = 3e5 + 70;
const int INF = 0x3f3f3f3f;
const ll inf = 0x3f3f3f3f3f3f3f3f;
const int MOD = 1e9 + 7;
const double eps = 1e-7;
const double PI = acos(-1.0);

int main(){
    //freopen("in.txt", "r", stdin);
    int T; cin >> T;
    while(T--){
        ll n, m, x1, x2;
        scanf("%lld %lld %lld %lld", &n, &m, &x1, &x2);

        ll ans = min((x1-1)*(x1-1), (m-x2)*(m-x2));

        ans = min(ans, (n-1)*(n-1));

        ll d = abs(x1 - x2) + (n - 1);
        if(x1 != x2) d--;
        ll r = d/2;
        ans = min(ans, r*r);

        printf("%lld\n", ans);
    }
    return 0;
}