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K Subsets With Equal Sum

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1. You are given an array of n distinct integers.
2. You have to divide these n integers into k non-empty subsets such that sum of integers of every 
     subset is same.
3. If it is not possible to divide, then print "-1".

Note -> Check out the question video and write the recursive code as it is intended without 
               changing signature. The judge can't force you but intends you to teach a concept.
Input Format 
A number n
n distinct integers 
A number k
Output Format 
Check the sample ouput and question video.
Question Video
Constraints 
1 <= n <= 20
1 <= arr[i] <= 100
1 <= k <= n
Sample Input 
6
1
2
3
4
5
6
3
Sample Output 
[1, 6] [2, 5] [3, 4]


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