Given an array arr of positive integers of size N and an integer K, the task is to find the sum of all subsets of size K.
Input:
1. The first line of the input contains a single integerT denoting the number of test cases. The description of T test cases follows.
2. The first line of each test case contains two integers N and K.
3. The next line contains N space-separated integers.
Output: For each test case, printthe answer
Constraints:
1. 1 <= T <= 10 2. 1 <= K <= N <= 12
3. 1 <= arr[i] <= 100
Example:
Input: 2 4 2
1 2 3 5
1 1
20
Output: 33
20
Explanation: Test Case 1: Subsets are {1, 2}, {1, 3}, {1, 5}, {2, 3}, {2, 5}, {3, 5}, Summation of all subsets sum = 3 + 4 + 6 + 5 + 7 + 8 = 33
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Avoid using static/global variables in coding problems as your code is tested
against multiple test cases and these tend to retain their previous values.
Passing the Sample/Custom Test cases in coding problems does not guarantee the
correctness of code. On submission, your code is tested against multiple test cases
consisting of all possible corner cases and stress constraints.
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