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Grokking the Coding Interview Patterns in Python

Solution: Subsets II

Explore how to generate all unique subsets of an integer array that may include duplicates by applying sorting and backtracking. Learn to implement depth-first search to build subsets safely, skip duplicates, and understand the time and space complexity of this approach.

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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 <= ...