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Problem - 2274B - Codeforces


B. Prefix
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output

You are given an array $$$a_1, a_2, \ldots, a_n$$$.

For each index $$$i = 2, 3, \ldots, n$$$ in order, perform the following:

  • Define $$$s = a_1 + a_2 + \ldots + a_{i-1}$$$.
  • Replace $$$a_i$$$ with one of the following three values: $$$a_i - s$$$, $$$a_i$$$, or $$$a_i + s$$$.

Over all possible choices, find the maximum value of $$$\max(a_1, a_2, \ldots, a_n)$$$ after the process described above.

Input

Each test contains multiple test cases. The first line contains the number of test cases $$$t$$$ ($$$1 \le t \le 10^4$$$). The description of the test cases follows.

The first line of each test case contains a single integer $$$n$$$ ($$$2 \le n \le 50$$$).

The second line of each test case contains $$$n$$$ integers $$$a_1, a_2, \ldots, a_n$$$ ($$$-50 \le a_i \le 50$$$).

Output

For each test case, output a single integer — the maximum achievable value of $$$\max(a_1, a_2, \ldots, a_n)$$$.

Please note that the answer for some test cases won't fit into a 32-bit integer type, so you should use at least a 64-bit integer type in your programming language (like long long in C++).

Example
Input
4
5
3 -5 1 -4 2
2
-1 2
3
1 2 3
3
-2 -2 -2
Output
24
3
7
4
Note

In the first test case, the final array can be made $$$[3, -8, -4, -13, 24]$$$, so the answer is $$$24$$$.

In the second test case, for $$$i = 2$$$, $$$s = a_1 = -1$$$. Replacing $$$a_2$$$ with $$$a_2 - s = 2 - (-1) = 3$$$ gives the answer $$$3$$$.

In the third test case, the final array can be made $$$[1, 3, 7]$$$, so the answer is $$$7$$$.

In the fourth test case, replacing $$$a_2$$$ with $$$a_2 + s = -4$$$ makes $$$s = -6$$$ for $$$i = 3$$$. Replacing $$$a_3$$$ with $$$a_3 - s = -2 - (-6) = 4$$$ gives the final array $$$[-2, -4, 4]$$$, so the answer is $$$4$$$.