Given an unsorted array nums, reorder it in-place such that nums[0] <= nums[1] >= nums[2] <= nums[3]…. For example, given nums = [3, 5, 2, 1, 6, 4], one possible answer is [1, 6, 2, 5, 3, 4], another could be [3, 5, 1, 6, 2, 4]. Basically, A[0] <= A[1] >= A[2] <= A[3] […]
