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# 55.1 二叉树的深度
[NowCoder](https://www.nowcoder.com/practice/435fb86331474282a3499955f0a41e8b?tpId=13&tqId=11191&tPage=1&rp=1&ru=/ta/coding-interviews&qru=/ta/coding-interviews/question-ranking&from=cyc_github)
## 题目描述
从根结点到叶结点依次经过的结点含根叶结点形成树的一条路径最长路径的长度为树的深度
<img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/ba355101-4a93-4c71-94fb-1da83639727b.jpg" width="350px"/>
## 解题思路
```java
public int TreeDepth(TreeNode root) {
return root == null ? 0 : 1 + Math.max(TreeDepth(root.left), TreeDepth(root.right));
}
```