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Maximum sum
 Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 40791 Accepted: 12724

Description

Given a set of n integers: A={a1, a2,..., an}, we define a function d(A) as below:

Input

The input consists of T(<=30) test cases. The number of test cases (T) is given in the first line of the input.
Each test case contains two lines. The first line is an integer n(2<=n<=50000). The second line contains n integers: a1, a2, ..., an. (|ai| <= 10000).There is an empty line after each case.

Output

Print exactly one line for each test case. The line should contain the integer d(A).

Sample Input

```1

10
1 -1 2 2 3 -3 4 -4 5 -5```

Sample Output

`13`

Hint

In the sample, we choose {2,2,3,-3,4} and {5}, then we can get the answer.

Huge input,scanf is recommended.

Source

POJ Contest,Author:Mathematica@ZSU

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