2019-11-02 12:07:41 +08:00
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# 27. 二叉树的镜像
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[NowCoder](https://www.nowcoder.com/practice/564f4c26aa584921bc75623e48ca3011?tpId=13&tqId=11171&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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2019-12-06 10:11:23 +08:00
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<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/0c12221f-729e-4c22-b0ba-0dfc909f8adf.jpg" width="300"/> </div><br>
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2019-11-02 12:07:41 +08:00
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## 解题思路
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```java
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public void Mirror(TreeNode root) {
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if (root == null)
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return;
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swap(root);
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Mirror(root.left);
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Mirror(root.right);
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}
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private void swap(TreeNode root) {
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TreeNode t = root.left;
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root.left = root.right;
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root.right = t;
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}
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```
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