144. 二叉树的前序遍历（中等）
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]
algorithms/src/main/java/com/wld/java/leetcode/leetCode0144.md at master · sdwwld/algorithms
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