Given an array of integers of size **N** and a number **K**. Your must modify array K number of times. Here modify array means in each operation you can replace any array element either **arr[i] by -arr[i]** or **-arr[i] by arr[i]**. You need to perform this operation in such a way that after K operations, sum of array must be maximum.

**Input:**

The first line of input contains an integer **T** denoting the number of test cases. Then T test cases follow. Each test case consist of two lines . The first line of each test case contains an integer N and K. The second line of each test case contains N space separated integers denoting elements of the array.

**Output:**

For each test case, print maximum possible sum.

**Constraints:**

1 ≤ T ≤ 100

1 ≤ N ≤ 10^{7}

-10^{18} ≤ A_{i} ≤ 10^{18}

**Example:**

**Input:**

2

5 1

1 2 -3 4 5

10 5

5 -2 5 -4 5 -12 5 5 5 20

**Output:**

15

68

**Explanation:
Testcase 1: **In testcase 1 we have k=1 so we can change -3 to 3 and sum all the elements to produce 15 as output.

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