1. 翻转二叉树:https://leetcode-cn.com/problems/invert-binary-tree/

 

2. 二叉树展开为链表,关键在于找到递归部分:https://leetcode-cn.com/problems/flatten-binary-tree-to-linked-list/

fucking algorithm - 二叉树(东哥篇)_二叉树