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leetcode144:二叉树的前序遍历 #37

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@sisterAn

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@sisterAn

给定一个二叉树,返回它的 前序 遍历。

 示例:

输入: [1,null,2,3]  
   1
    \
     2
    /
   3 

输出: [1,2,3]

进阶: 递归算法很简单,你可以通过迭代算法完成吗?

附赠leetcode地址:leetcode

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