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

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    static int[] NMi => ReadLine().Split().Select(c => int.Parse(c) - 1).ToArray();
    static int[][] NMap(int n) => Enumerable.Repeat(0, n).Select(_ => NMi).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 n = NN;
            var a = NList;
            ans[u] = Triple(n, a);
        }
        WriteLine(string.Join("\n", ans));
    }
    static long Triple(int n, int[] a)
    {
        var left = 0L;
        for (var i = 0; i < n - 2; ++i) left += a[i];
        var max = (long)a[n - 2];
        var min = (long)a[n - 2];
        var sum = (long)a[n - 2] + a[n - 1];
        var ans = 0L;
        for (var i = n - 3; i >= 0; --i)
        {
            ans = Math.Max(ans, Math.Abs(left) +
                Math.Max(Math.Abs(sum), Math.Max(Math.Abs(-min) + Math.Abs(sum - min), Math.Abs(max) + Math.Abs(sum - max))));
            max = Math.Max(a[i], max + a[i]);
            min = Math.Min(a[i], min + a[i]);
            sum += a[i];
            left -= a[i];
        }
        return ans;
    }
}