hardMathRecursion 0 views
Permutation Sequence
The set [1, 2, 3, ..., n] contains a total of n!
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:
Given n and k, return the kth permutation sequence.
Example 1
Input: n = 3, k = 3
Output: "213"
Example 2
Input: n = 4, k = 9
Output: "2314"
Example 3
Input: n = 3, k = 1
Output: "123"
Constraints
- 1 <= n <= 9
- 1 <= k <= n!
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