Balance a Binary Search Tree
Medium
Provided the root of a binary search tree, produce a balanced binary search tree with the same node values. If there is more than one answer, produce any of them.
A binary search tree is balanced if the depth of the two subtrees of every node never differs by more than 1.
Example 1
Input: root = [1,null,2,null,3,null,4,null,null]
Output: [2,1,3,null,null,null,4]
Explanation: This is not the only correct answer, [3,1,4,null,2] is also correct.
Example 2
Input: root = [2,1,3]
Output: [2,1,3]
Constraints
- The number of nodes in the tree is in the range
[1, 10^4 ]. 1 <= Node.val <= 10^5
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