Convert Sorted Array to Binary Search Tree (C# and Python3)

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

height-balanced binary tree is a binary tree in which the depth of the two subtrees of every node never differs by more than one.


Step 1: select a root (the middle)

Step 2: create subarrays at the left and the right of the array

Step 3: Recursive DFS



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