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 (ie, for n = 3):
-
"123"
-
"132"
-
"213"
-
"231"
-
"312"
-
"321"
Given n and k, return the kth permutation sequence.
Note: Given n will be between 1 and 9 inclusive.