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Update trie.md
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thinkings/trie.md

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- 假定给出几个单词如[she,he,her,good,god]构造出一个 Trie 如下图:
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![Trie%200c1c1245b4df467e91ceb6931c94701d/Untitled.png](Trie%200c1c1245b4df467e91ceb6931c94701d/Untitled.png)
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![](https://tva1.sinaimg.cn/large/008eGmZEly1gmlx7lukrmj30gb0abt9w.jpg)
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- 也就是说从根结点出发到某一粉色节点所经过的字符组成的单词,在单词列表中出现过,当然我们也可以给树的每个节点加个 count 属性,代表根结点到该节点所构成的字符串前缀出现的次数
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![Trie%200c1c1245b4df467e91ceb6931c94701d/Untitled%201.png](Trie%200c1c1245b4df467e91ceb6931c94701d/Untitled%201.png)
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![](https://tva1.sinaimg.cn/large/008eGmZEly1gmlx7whonvj30g709nwfl.jpg)
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可以看出树的构造非常简单,插入新单词的时候就从根结点出发一个字符一个字符插入,有对应的字符节点就更新对应的属性,没有就创建一个!
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