Get k-th Permutation


The set [1, 2, 3, ..., n] contains a total of n! unique permutations.
By listing and labeling all of the permutations in order, we get the following sequence for n = 3: "123" "132" "213" "231" "312" "321"
Given n and k, return the kth permutation sequence. #leetcode #hard #permutation
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