!!!!!!114. Flatten Binary Tree to Linked List

Posted 2020-07-30 积少成多

Given a binary tree, flatten it to a linked list in-place.

For example,
Given

         1
        /        2   5
      / \        3   4   6

 

The flattened tree should look like:

   1
         2
             3
                 4
                     5
                         6

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思路:

将一个二叉树 就地 压成"链表"的结构;