1257/A : Two Rival Students

#include <iostream>
using namespace std;

int main() {

    int t, n, x, a, b;
    cin >> t;

for (int T = 0; T < t; T++) {

    cin >> n >> x >> a >> b;
    int i = 1;

    while (a > 0 && a <= n && b > 0 && b <= n && i <= x) {

        if (a > b&& a < n)
            a++;
        else if (b > a&& b < n)
            b++;
        else if (a > b&& a == n && b > 1)
            b--;
        else if (b > a&& b == n && a > 1)
            a--;

        i++;
    }

    if (a >= b)
        cout << a - b << endl;
    else
        cout << b - a << endl;
}

    return 0;
}