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docs/notes/55.1 二叉树的深度.md
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# 55.1 二叉树的深度
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[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)
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## 题目描述
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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。
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<img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/ba355101-4a93-4c71-94fb-1da83639727b.jpg" width="350px"/>
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## 解题思路
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```java
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public int TreeDepth(TreeNode root) {
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return root == null ? 0 : 1 + Math.max(TreeDepth(root.left), TreeDepth(root.right));
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}
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```
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