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Permutations II (medium)
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Problem Statement

Given a list of numbers nums that might have duplicates, return all unique arrangements of the numbers in any order.

Examples

Example 1:

  • Input: nums = [1, 2, 2]
  • Output: [[1,2,2],[2,1,2],[2,2,1]]
  • Explanation: There are a total of 6 permutations of [1, 2, 2] list but only 3 are unique.

Example 2:

  • Input: nums = [2, 2, 3]
  • Output: [[2,2,3],[2,3,2],[3,2,2]]
  • Explanation: All unique permutations of the list [2, 2, 3] are shown above.

Example 3:

  • Input: nums = [1, 2, 2, 3]

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