using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static long[] NList => ReadLine().Split().Select(long.Parse).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var t = NN;
        var ans = new long[t];
        for (var u = 0; u < t; ++u)
        {
            var c = NList;
            var (a, b) = (c[0], c[1]);
            var m2 = 4 * a * b;
            var m = (long)Math.Sqrt(m2);
            while (m * m < m2) ++m;
            while ((m - 1) * (m - 1) >= m2) --m;
            var ng = 0L;
            var ok = 3_000_000_000L;
            while (ok - ng > 1)
            {
                var mid = (ok + ng) / 2;
                if (m < mid * mid - a - b) ok = mid;
                else ng = mid;
            }
            ans[u] = ok;
        }
        WriteLine(string.Join("\n", ans));
    }
}