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Permutations

Given an array of distinct integers, return all possible orderings of its elements.

Constraints
  • 1 ≤ n ≤ 6
  • All elements distinct
Examples
in: nums = [1,2,3]
out: [[1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,1,2],[3,2,1]]

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