[Leetcode] Binary Tree Preorder Traversal
来源：互联网 发布：macbook电池检测软件 编辑：程序博客网 时间：2024/06/06 03:39
1. Recursive
2. iterative: 当前节点，输出，走左边，同时放到stack，stack不为空，出来做cur，变为右边。
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