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Grokking the Coding Interview Patterns

Solution: Subsets II

Explore how to generate all unique subsets from an integer array that may contain duplicates by applying a backtracking approach with depth-first search. This lesson teaches you to sort the array and skip duplicates during recursion to avoid repeated subsets, improving your problem-solving skills in coding interviews.

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Statement

Given an integer array nums, that can contain duplicate elements,  return all possible subsets while ensuring that each subset is unique. The output must include unique subsets, and you may return them in any order.

Constraints:

  • 1<=1 <= nums.length <=10<= 10

  • −10<=-10 <= nums[i] <=10<= 10 ...