Update

README.md

@@ -281,6 +281,7 @@
 |[0131.分割回文串](https://github.com/youngyangyang04/leetcode/blob/master/problems/0131.分割回文串.md) |回溯 |中等|**回溯**|
 |[0141.环形链表](https://github.com/youngyangyang04/leetcode/blob/master/problems/0141.环形链表.md) |链表 |简单|**快慢指针/双指针**|
 |[0142.环形链表II](https://github.com/youngyangyang04/leetcode/blob/master/problems/0142.环形链表II.md) |链表 |中等|**快慢指针/双指针**|
+|[0143.重排链表](https://github.com/youngyangyang04/leetcode/blob/master/problems/0143.重排链表.md) |链表 |中等|**快慢指针/双指针** 也可以用数组，双向队列模拟，考察链表综合操作的好题|
 |[0144.二叉树的前序遍历](https://github.com/youngyangyang04/leetcode/blob/master/problems/0144.二叉树的前序遍历.md) |树 |中等|**递归** **迭代/栈**|
 |[0145.二叉树的后序遍历](https://github.com/youngyangyang04/leetcode/blob/master/problems/0145.二叉树的后序遍历.md) |树 |困难|**递归** **迭代/栈**|
 |[0151.翻转字符串里的单词](https://github.com/youngyangyang04/leetcode/blob/master/problems/0151.翻转字符串里的单词.md) |字符串 |中等|**模拟/双指针**|
@@ -339,6 +340,7 @@
 |[0705.设计哈希集合](https://github.com/youngyangyang04/leetcode/blob/master/problems/0705.设计哈希集合.md) |哈希表 |简单|**模拟**|
 |[0707.设计链表](https://github.com/youngyangyang04/leetcode/blob/master/problems/0707.设计链表.md) |链表 |中等|**模拟**|
 |[0841.钥匙和房间](https://github.com/youngyangyang04/leetcode/blob/master/problems/0841.钥匙和房间.md) |孤岛问题 |中等|**bfs** **dfs**|
+|[0844.比较含退格的字符串](https://github.com/youngyangyang04/leetcode/blob/master/problems/0844.比较含退格的字符串.md) |字符串 |简单|**栈** **双指针优化** 使用栈的思路但没有必要使用栈|
 |[0977.有序数组的平方](https://github.com/youngyangyang04/leetcode/blob/master/problems/0977.有序数组的平方.md) |数组 |中等|**双指针**|
 |[1002.查找常用字符](https://github.com/youngyangyang04/leetcode/blob/master/problems/1002.查找常用字符.md) |栈 |简单|**栈**|
 |[1047.删除字符串中的所有相邻重复项](https://github.com/youngyangyang04/leetcode/blob/master/problems/1047.删除字符串中的所有相邻重复项.md) |哈希表 |简单|**哈希表/数组**|