leetcode每日一題：從前序和中序遍歷構造二叉樹

原創 wyy_blog 2020-05-24 05:47

-  遍歷pIndex操作優化:將中序遍歷序列遍歷一次，將數值和下標存儲在unordered_map裏

- 遞歸時需要傳入的參數：

1： 前序遍歷序列

2：中序遍歷序列

3：前序遍歷的左邊界

4：前序遍歷的右邊界

5：中序遍歷的左邊界

6：中序遍歷的右邊界

7：存儲中序遍歷數值和下標的映射關係的unordered_map

【來自leetcode  題解視頻】

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