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Update the captions of all the figures.

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krahets
2023-02-26 18:18:34 +08:00
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docs/chapter_tree/binary_tree_traversal.md
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层序遍历本质上是「广度优先搜索 Breadth-First Traversal」，其体现着一种“一圈一圈向外”的层进遍历方式。
![binary_tree_bfs](binary_tree_traversal.assets/binary_tree_bfs.png)
![二叉树的层序遍历](binary_tree_traversal.assets/binary_tree_bfs.png)
<p align="center"> Fig. 二叉树的层序遍历 </p>
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如下图所示，左侧是深度优先遍历的的示意图，右上方是对应的递归实现代码。深度优先遍历就像是绕着整个二叉树的外围“走”一圈，走的过程中，在每个结点都会遇到三个位置，分别对应前序遍历、中序遍历、后序遍历。
![binary_tree_dfs](binary_tree_traversal.assets/binary_tree_dfs.png)
![二叉搜索树的前、中、后序遍历](binary_tree_traversal.assets/binary_tree_dfs.png)
<p align="center"> Fig. 二叉树的前 / 中 / 后序遍历 </p>