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Grokking the Coding Interview Patterns in C#

Solution: Subsets II

Explore the backtracking technique to generate all unique subsets from an integer array containing duplicates. This lesson teaches you how sorting the array and selectively skipping duplicate elements in recursion ensures each subset is unique. You will understand the depth-first search approach used, time and space complexity considerations, and how to implement this pattern efficiently in C#.

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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 ...