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update 二叉树集合
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数据结构/Leetcode经典二叉树题目集合.md

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​ <img src="https://github.com/wuqinqiang/Lettcode-php/blob/master/images/144.png">
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**前序遍历,先访问根结点,然后在访问左子树,最后访问右子树。可以利用栈的特点,这里我结合了队列和栈的特点来实现。先压入树,取出根节点。先把根节点值push到队列中,然后把右子树压入栈中,最后压入左子树。返回队列。当然你可以调整成你想要的实现方式。(只要前中后序顺序理解正确即可)**
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**前序遍历,先访问根结点,然后在访问左子树,最后访问右子树。这里我结合了队列和栈的特点来实现。先压入树,取出根节点。先把根节点值push到队列中,然后把右子树压入栈中,最后压入左子树。返回队列。当然你可以调整成你想要的实现方式。(只要前中后序顺序理解正确即可)**
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```php
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