using System;
using System.IO;
using System.Linq;
using System.Text;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using Enu = System.Linq.Enumerable;

class Program
{
    static readonly int INF = (int)2e9;

    public void Solve()
    {
        int T = Reader.Int();
        for (int ti = 0; ti < T; ti++)
        {
            int N = Reader.Int();
            var A = Reader.IntArray(N);
            Console.WriteLine(Calc(A));
        }
    }

    private int Calc(int[] A)
    {
        var L = DP(0, 1, A);
        var R = DP(A.Length - 1, -1, A);
        int[] maxL = new int[A.Length];
        int[] maxR = new int[A.Length];
        for (int i = 0; i < A.Length; i++)
            for (int num = 1; num <= A.Length; num++)
            {
                if (L[i][num] < INF) maxL[i] = num;
                if (R[i][num] < INF) maxR[i] = num;
            }
        int ans = 0;
        for (int i = 0; i < A.Length; i++)
            ans = Math.Max(ans, maxL[i] + maxR[i] - 1);
        return ans;
    }

    int[][] DP(int start, int dir, int[] A)
    {
        var dp = new int[A.Length][];
        for (int i = 0; i < dp.Length; i++)
        {
            dp[i] = new int[A.Length + 1];
            for (int num = 0; num < dp[i].Length; num++) dp[i][num] = INF;
        }
        for (int i = start; i >= 0 && i < A.Length; i += dir)
        {
            dp[i][1] = 0;
            for (int last = i - dir; last >= 0 && last < A.Length; last -= dir)
                for (int num = 1; num <= A.Length; num++)
                    if (A[i] - A[last] > dp[last][num])
                        CheckMin(ref dp[i][num + 1], A[i] - A[last]);
        }
        return dp;
    }

    void CheckMin(ref int a, int b) { if (b < a) a = b; }
}


class Entry { static void Main() { new Program().Solve(); } }
class Reader
{
    private static TextReader reader = Console.In;
    private static readonly char[] separator = { ' ' };
    private static readonly StringSplitOptions op = StringSplitOptions.RemoveEmptyEntries;
    private static string[] A = new string[0];
    private static int i;
    private static void Init() { A = new string[0]; }
    public static void Set(TextReader r) { reader = r; Init(); }
    public static void Set(string file) { reader = new StreamReader(file); Init(); }
    public static bool HasNext() { return CheckNext(); }
    public static string String() { return Next(); }
    public static int Int() { return int.Parse(Next()); }
    public static long Long() { return long.Parse(Next()); }
    public static double Double() { return double.Parse(Next()); }
    public static int[] IntLine() { return Array.ConvertAll(Split(Line()), int.Parse); }
    public static int[] IntArray(int N) { return Enu.Range(0, N).Select(i => Int()).ToArray(); }
    public static int[][] IntTable(int H) { return Enu.Range(0, H).Select(i => IntLine()).ToArray(); }
    public static string[] StringArray(int N) { return Enu.Range(0, N).Select(i => Line()).ToArray(); }
    public static string Line() { return reader.ReadLine().Trim(); }
    private static string[] Split(string s) { return s.Split(separator, op); }
    private static string Next() { CheckNext(); return A[i++]; }
    private static bool CheckNext()
    {
        if (i < A.Length) return true;
        string line = reader.ReadLine();
        if (line == null) return false;
        if (line == "") return CheckNext();
        A = Split(line);
        i = 0;
        return true;
    }
}