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468. Unique subsets with a given sum with allowed repeated digits.
Objective: Given an array of integers and number N, Write an algorithm to find and print all the unique subsets of array for which sum is equal to N where array elements can be repeated any number of times.
Example:
int [] arrA={2,4,3} sum =6 Output: [2, 2, 2] [2, 4] [3, 3] int [] arrA={2,6,3,5} Sum = 8 [2, 2, 2, 2] [2, 3, 3] [2, 6] [3, 5]
Approach: Use Recursion
 Given arrA[] and sum.
 Sort the arrA[] in ascending order.
 Start with currSum = 0, startIndex = 0, combinationList=null
 Iterate through i = startIndex to length(arrA[]).
 Add arrA[i] to currSum.
 Put arrA[i] to combinationList.
 Make a recursive call with startIndex (to process next elements) and combinationList.
 In tail recursion, backtrack and remove arrA[i] from the combinationList to find more solutions
 Base case: if currSum=sum, Print combinationList.
Output:
Given Array: [2, 6, 3, 5], required sum: 8 [2, 2, 2, 2] [2, 3, 3] [2, 6] [3, 5]