leetcode/0110_balanced-binary-tree/README.md

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Given a binary tree, determine if it is height-balanced.
For this problem, a height-balanced binary tree is defined as:
> a binary tree in which the left and right subtrees of _every_ node differ in height by no more than 1.
**Example 1:**
![](https://assets.leetcode.com/uploads/2020/10/06/balance_1.jpg)
Input: root = [3,9,20,null,null,15,7]
Output: true
**Example 2:**
![](https://assets.leetcode.com/uploads/2020/10/06/balance_2.jpg)
Input: root = [1,2,2,3,3,null,null,4,4]
Output: false
**Example 3:**
Input: root = []
Output: true
**Constraints:**
* The number of nodes in the tree is in the range `[0, 5000]`.
* `-104 <= Node.val <= 104`