#include <bits/stdc++.h>

#define ll long long
#define endl "\n"
#define __count __builtin_popcount
#define yes cout<<"Yes\n";
#define no cout<<"No\n";
using namespace std;

void solve() {
    ll x, y;
    cin >> x >> y;
    if (y <= x) {
        cout << x - y << endl;
        return;
    }
    ll l, r;
    l = 0, r = 2e10 + 7;
    while (l + 1 != r) {
        ll mid = l + r >> 1;
        if (mid * (mid + 1) / 2 >= x) {
            r = mid;
        } else l = mid;
    }
    ll xt = r;
    xt++;
    l = 0;
    r = 2e10 + 7;
    while (l + 1 != r) {
        ll mid = l + r >> 1;
        if (mid * (mid + 1) / 2 >= y) {
            r = mid;
        } else l = mid;
    }
    ll yt = r;
    yt++;

    ll ansx = x + (xt + yt - 1) * (yt - xt) / 2;
//    cout << x << " " << y << " " << xt << " " << yt << " " << ansx << endl;
    if (ansx < y) {
        ll bnsx = y - (xt + yt - 1) * (yt - xt) / 2;
        bnsx -= (xt - 1);
//        cout << bnsx << endl;
        cout << x - bnsx + (yt - xt)+1 << endl;
    } else {
        cout << ansx - y + (yt - xt) << endl;
    }
}

signed main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);

    ll t = 1;
    cin >> t;
    while (t--)
        solve();
}