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g0101_0200.s0104_maximum_depth_of_binary_tree.readme.md Maven / Gradle / Ivy

104\. Maximum Depth of Binary Tree

Easy

Given the `root` of a binary tree, return _its maximum depth_.

A binary tree's **maximum depth** is the number of nodes along the longest path from the root node down to the farthest leaf node.

**Example 1:**

![](https://assets.leetcode.com/uploads/2020/11/26/tmp-tree.jpg)

**Input:** root = [3,9,20,null,null,15,7]

**Output:** 3 

**Example 2:**

**Input:** root = [1,null,2]

**Output:** 2 

**Example 3:**

**Input:** root = []

**Output:** 0 

**Example 4:**

**Input:** root = [0]

**Output:** 1 

**Constraints:**

*   The number of nodes in the tree is in the range [0, 104].
*   `-100 <= Node.val <= 100`