#include <bits/stdc++.h>
using namespace std;
#define int long long
#define VI vector<int>
#define i128 __int128
typedef long long ll;
typedef pair<int,int> PII;
#define debug(x, y) cout << '#' << x << '+' << y << endl

int sum(int x) { return x * (x + 1) / 2; }

int get(int x)
{
    int l = 1, r = 2e9;
    while(l < r)
    {
        int mid = l + r >> 1;
        if (sum(mid) >= x) r = mid;
        else l = mid + 1;
    }
    return l;
}



void solve()
{
    int a, b;
    cin >> a >> b;
    if (b < a) cout << a - b << '\n';
    else {
        int la = get(a), lb = get(b);
        int ans = sum(lb) - b - (sum(la) - a);
        if (ans < 0)
        {
            ans = sum(lb) - b + (a - sum(la - 1)) + 1;
        }
        cout << lb - la + ans << '\n';
    }
}

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int T;
    T = 1;
    cin >> T;
    while(T -- )
    {
        solve();
    }
    return 0;
}