using static System.Math;
using System;

public class Hello
{
    public static int[] a, b, c;
    static void Main()
    {
        var q = int.Parse(Console.ReadLine().Trim());
        while (q-- > 0)
        {
            var n = int.Parse(Console.ReadLine().Trim());
            string[] line = Console.ReadLine().Trim().Split(' ');
            a = new int[n];
            b = new int[n];
            c = new int[n];
            for (int i = 0; i < n; i++)
            {
                var t = int.Parse(line[i]);
                a[i] = t;
                if (i - 1 >= 0) b[i - 1] = t;
                if (i - 2 >= 0) c[i - 2] = t;
            }
            b[n - 1] = a[0]; c[n - 2] = a[0]; c[n - 1] = a[1];
            var ans = Max(Dp(n, a), Dp(n, b));
            ans = Max(ans, Dp(n, c));
            Console.WriteLine(ans);
        }
    }
    static long Dp(int n, int[] t)
    {
        var dp = new long[n];
        dp[2] = check(t[0], t[1], t[2]) ? t[0] : 0;
        for (int i = 3; i < n; i++)
        {
            if (check(t[i - 2], t[i - 1], t[i]))
                dp[i] = Max(dp[i - 1], dp[i - 3] + t[i - 2]);
            else dp[i] = dp[i - 1];
        }
        return dp[n - 1];
    }
    static bool check(int t0, int t1, int t2)
    {
        if (!(t0 != t1 && t1 != t2 && t0 != t2)) return false;
        if (t1 > t0 && t1 > t2) return true;
        if (t1 < t0 && t1 < t2) return true;
        return false;
    }
}