https://leetcode.com/problems/convert-sorted-array-to-binary-search-tree/

Given an integer array nums where the elements are sorted in ascending order, convert it to a height-balanced binary search tree.

Example

Example 1:

Input: nums = [-10,-3,0,5,9]
Output: [0,-3,9,-10,null,5]
Explanation: [0,-10,5,null,-3,null,9] is also accepted:

Example 2:

Input: nums = [1,3]
Output: [3,1]
Explanation: [1,null,3] and [3,1] are both height-balanced BSTs.

Constraints:

1 <= nums.length <= $10^{4}$
-$10^{4}$ <= nums[i] <= $10^{4}$
nums is sorted in a strictly increasing order.

PS: 这一题也可以结合无顺序作为考点，不过难度不大。