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|[0110.平衡二叉树](https://github.com/youngyangyang04/leetcode/blob/master/problems/0110.平衡二叉树.md) |树 |简单|**递归**|
|[0111.二叉树的最小深度](https://github.com/youngyangyang04/leetcode/blob/master/problems/0111.二叉树的最小深度.md) |树 |简单|**递归** **队列/BFS**|
|[0112.路径总和](https://github.com/youngyangyang04/leetcode/blob/master/problems/0112.路径总和.md) |树 |简单|**深度优先搜索/递归** **回溯** **栈**|
|[0116.填充每个节点的下一个右侧节点指针](https://github.com/youngyangyang04/leetcode/blob/master/problems/0116.填充每个节点的下一个右侧节点指针.md) |二叉树 |中等|**广度优先搜索**|
|[0117.填充每个节点的下一个右侧节点指针II](https://github.com/youngyangyang04/leetcode/blob/master/problems/0117.填充每个节点的下一个右侧节点指针II.md) |二叉树 |中等|**广度优先搜索**|
|[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**|
|[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**|
|[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**|
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|[0225.用队列实现栈](https://github.com/youngyangyang04/leetcode/blob/master/problems/0225.用队列实现栈.md) | 队列 |简单| **队列** |
|[0226.翻转二叉树](https://github.com/youngyangyang04/leetcode/blob/master/problems/0226.翻转二叉树.md) |二叉树 |简单| **递归** **迭代**|
|[0232.用栈实现队列](https://github.com/youngyangyang04/leetcode/blob/master/problems/0232.用栈实现队列.md) | 栈 |简单| **栈** |
|[0235.二叉搜索树的最近公共祖先](https://github.com/youngyangyang04/leetcode/blob/master/problems/0235.二叉搜索树的最近公共祖先.md) | 二叉搜索树 |简单| **递归** **迭代** |
|[0236.二叉树的最近公共祖先](https://github.com/youngyangyang04/leetcode/blob/master/problems/0236.二叉树的最近公共祖先.md) | 二叉树 |中等| **递归/回溯** |
|[0237.删除链表中的节点](https://github.com/youngyangyang04/leetcode/blob/master/problems/0237.删除链表中的节点.md) |链表 |简单| **原链表移除** **添加虚拟节点** 递归|
|[0239.滑动窗口最大值](https://github.com/youngyangyang04/leetcode/blob/master/problems/0239.滑动窗口最大值.md) |滑动窗口/队列 |困难| **单调队列**|
|[0242.有效的字母异位词](https://github.com/youngyangyang04/leetcode/blob/master/problems/0242.有效的字母异位词.md) |哈希表 |简单| **哈希**|