Add iterative tree

Author: zdong1995

README.md

@@ -28,6 +28,7 @@
 - [x] 半年零基础到 LeetCode 300 题，我的算法学习方法论: ✅ [Post](https://dongxiaoran.com/algo/basic/intro/)
 - [x] 当我们谈论刷题时，到底在刷什么: ✅ [Post](https://dongxiaoran.com/algo/basic/how/)
 - [x] 一题顶四题，一道题掌握 LinkedList 的 Iterative: ✅ [Post](https://dongxiaoran.com/algo/basic/iterativelist/) ⭐️ [Code](src/main/java/algorithm/basic/iterative)
+- [x] Tree 还可以这样 O(1) 空间遍历？四题带你深入理解 LinkedList 与 Tree 的关系: ✅ [Post](https://dongxiaoran.com/algo/basic/treetolist/) ⭐️ [Code](src/main/java/algorithm/basic/iterativetree)
 
 - [ ] Binary Search
 

src/main/java/algorithm/basic/iterative/ReorderList.java

@@ -4,7 +4,7 @@
 
 /**
  * Given a singly linked list L_0 → L_1 → … → L_{n-1} → L_n
- * Reverse it to L_n → L_{n-1} → … → L_1 → L_0
+ * Reverse it to L_0 → L_n → L_{n-1} → … → L_1 → L_0
  */
 public class ReorderList {
     public void reorderList(ListNode head) {