leetcode每日一题：从前序和中序遍历构造二叉树

原創 wyy_blog 2020-05-24 05:47

-  遍历pIndex操作优化:将中序遍历序列遍历一次，将数值和下标存储在unordered_map里

- 递归时需要传入的参数：

1： 前序遍历序列

2：中序遍历序列

3：前序遍历的左边界

4：前序遍历的右边界

5：中序遍历的左边界

6：中序遍历的右边界

7：存储中序遍历数值和下标的映射关系的unordered_map

【来自leetcode  题解视频】

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