Convert Sorted Array to Binary Search Tree

Given an array where elements are sorted in ascending order, convert it to a height balanced BST.

SOLUTION 1：
使用递归解决。

base case: 当索引值超过时，返回null.

递归主体：构造根节点，调用递归构造左右子树。并将左右子树挂在根节点上。

返回值：返回构造的根节点。

GITHUB:

https://github.com/yuzhangcmu/LeetCode_algorithm/blob/master/tree/SortedArrayToBST.java

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