func main()
	var t: int :: cui@inputInt()
	for(1, t)
		var n: int :: cui@inputInt()
		var a: []int :: #[n + 2]int
		for i(0, n - 1)
			do a[i] :: cui@inputInt()
		end for
		do a[n] :: a[0]
		do a[n + 1] :: a[1]
		
		var ans: int :: 0
		for i(0, 2)
			do ans :: [ans, f(a, n, i)].max()
		end for
		do cui@print("\{ans}\n")
		func f(a: []int, n: int, di: int): int
			var dp: [][]int :: #[n - 1, 3]int
			for i(0, n - 3)
				var val: int :: 0
				if(a[di + i] <> a[di + i + 2])
					if(a[di + i] < a[di + i + 1]
						|&a[di + i + 2] < a[di + i + 1]
						||a[di + i] > a[di + i + 1]
						|&a[di + i + 2] > a[di + i + 1])
						do val :: a[di + i]
					end if
				end if
				do dp[i + 1][0] :: [dp[i][0], dp[i][1]].max()
				do dp[i + 1][1] :: dp[i][2]
				do dp[i + 1][2] :: dp[i][0] + val
			end for
			ret dp[n - 2].max()
		end func
	end for
end func