Given an unsorted array nums, reorder it such that nums[0] < nums[1] > nums[2] < nums[3]....
Example 1:
Input:nums = [1, 5, 1, 1, 6, 4]Output: One possible answer is[1, 4, 1, 5, 1, 6].
Example 2:
Input:nums = [1, 3, 2, 2, 3, 1]Output: One possible answer is[2, 3, 1, 3, 1, 2].
Note:
You may assume all input has valid answer.
Follow Up:
Can you do it in O(n) time and/or in-place with O(1) extra space?
原文：https://www.cnblogs.com/simplepaul/p/10693491.html