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docs/notes/7. 重建二叉树.md
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<div align="center"> <img src="pics/image-20191102210342488.png" width="400"/> </div><br>
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20191102210342488.png" width="400"/> </div><br>
## 解题思路
前序遍历的第一个值为根节点的值，使用这个值将中序遍历结果分成两部分，左部分为树的左子树中序遍历结果，右部分为树的右子树中序遍历的结果。然后分别对左右子树递归地求解。
<div align="center"> <img src="pics/60c4a44c-7829-4242-b3a1-26c3b513aaf0.gif" width="430px"> </div><br>
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/60c4a44c-7829-4242-b3a1-26c3b513aaf0.gif" width="430px"> </div><br>
```java
// 缓存中序遍历数组每个值对应的索引