18. Next Permutation
Given an integer array nums, return its next lexicographically greater permutation.
Return the adjusted nums array for the current judge. The original LeetCode problem requires an in-place update.
Example 1:
Input: nums = [1,2,3] Output: [1,3,2]
Example 2:
Input: nums = [3,2,1] Output: [1,2,3]
Constraints:
1 <= nums.length <= 100