You are an expert competitive programmer. You will be given a problem statement, test case constraints and example test inputs and outputs. Please reason step by step about the solution (that must respect memory and time limits), then provide a complete implementation in c++17.

Your solution must read input from standard input (cin), write output to standard output (cout).
Do not include any debug prints or additional output.

Put your final solution within a single code block:
```cpp
<your code here>
```

Execution time limit: 1.0 seconds
Memory limit: 256.0 MB

# Problem
LuoTianyi gave an array $$$b$$$ of $$$n \cdot m$$$ integers. She asks you to construct a table $$$a$$$ of size $$$n \times m$$$, filled with these $$$n \cdot m$$$ numbers, and each element of the array must be used exactly once. Also she asked you to maximize the following value:

$$$\sum\limits_{i=1}^{n}\sum\limits_{j=1}^{m}\left(\max\limits_{1 \le x \le i, 1 \le y \le j}a_{x,y}-\min\limits_{1 \le x \le i, 1 \le y \le j}a_{x,y}\right)$$$

This means that we consider $$$n \cdot m$$$ subtables with the upper left corner in $$$(1,1)$$$ and the bottom right corner in $$$(i, j)$$$ ($$$1 \le i \le n$$$, $$$1 \le j \le m$$$), for each such subtable calculate the difference of the maximum and minimum elements in it, then sum up all these differences. You should maximize the resulting sum.

Help her find the maximal possible value, you don't need to reconstruct the table itself.

## Input Format
Each test consists of multiple test cases. The first line contains a single integer $$$t$$$ ($$$1 \le t \le 200$$$) — the number of test cases. The description of test cases follows.

The first line of each test case contains two integers $$$n$$$ and $$$m$$$ ($$$2 \le n, m \le 100$$$) — the number of rows and columns of the table.

The second line of each test case contains $$$n \cdot m$$$ integers $$$b_1, b_2, \ldots, b_{n\cdot m}$$$ ($$$-10^5 \le b_{i} \le 10^5$$$) — the numbers you can put in the table.

Note, that integers in the array $$$b$$$ can be negative.

It is guaranteed that the sum of $$$n \cdot m$$$ over all test cases doesn't exceed $$$2\cdot 10^5$$$.

## Output Format
For each test case, output a single integer — the maximal value, that can be obtained.

## Examples
```input
5
2 2
1 3 1 4
2 2
-1 -1 -1 -1
2 3
7 8 9 -3 10 8
3 2
4 8 -3 0 -7 1
4 3
-32030 59554 16854 -85927 68060 -64460 -79547 90932 85063 82703 -12001 38762
```
```output
9
0
64
71
1933711
```

## Note
In the first test case, the table is follows:

4113

In the subtable with the bottom right corner in $$$(1, 1)$$$, the difference of the maximal and minimal elements is $$$4 - 4 = 0$$$.

In the subtable with the bottom right corner in $$$(1, 2)$$$, the difference of the maximal and minimal elements is $$$4 - 1 = 3$$$.

In the subtable with the bottom right corner in $$$(2, 1)$$$, the difference of the maximal and minimal elements is $$$4 - 1 = 3$$$.

In the subtable with the bottom right corner in $$$(2, 2)$$$, the difference of the maximal and minimal elements is $$$4 - 1 = 3$$$.

Then the maximum possible value is $$$0+3+3+3=9$$$.

In the second test case, all elements are equal, so all differences are $$$0$$$, and the answer is $$$0$$$.

Now solve the problem and return the code.