K Max Sum Combinations Problem Statement

Given two arrays/lists A and B, each of size N, and an integer K, you need to determine the K maximum and valid sum combinations from all possible combinations of sums generated by adding one element from array A with one element from array B.

Input:

The first line contains an integer 'T', representing the number of test cases. Each test case includes:
The first line with two integers 'N' and 'K', indicating the size of the arrays/lists and the number of sum combinations required.
The second line with 'N' space-separated integers representing the elements of array 'A'.
The third line with 'N' space-separated integers representing the elements of array 'B'. 

Output:

For each test case, return the top 'K' maximum sum combinations in descending order.

Example:

Input:

A : [1, 3] 
B : [4, 2] 
K : 2 

Output:

[7, 5]

Explanation:

The possible sum combinations are 5(3 + 2), 7(3 + 4), 3(1 + 2), and 5(1 + 4). The 2 maximum sum combinations are 7 and 5.

Constraints:

• 1 ≤ T ≤ 5
• 1 ≤ N ≤ 100
• 1 ≤ K ≤ N
• -105 ≤ A[i], B[i] ≤ 105
• Time limit: 1 sec

Note:

You are not required to print anything explicitly; just implement the function as instructed.