| 103. 二叉树的锯齿形层次遍历 | 2 | https://leetcode-cn.com/problems/binary-tree-zigzag-level-order-traversal |
| 72. 编辑距离 | 2 | https://leetcode-cn.com/problems/edit-distance |
| 46. 全排列 | 2 | https://leetcode-cn.com/problems/permutations |
| 23. 合并K个排序链表 | 2 | https://leetcode-cn.com/problems/merge-k-sorted-lists |
| 206. 反转链表 | 2 | https://leetcode-cn.com/problems/reverse-linked-list |
| 144. 二叉树的前序遍历 | 1 | https://leetcode-cn.com/problems/binary-tree-preorder-traversal |
| 15. 三数之和 | 1 | https://leetcode-cn.com/problems/3sum |
| 补充题8. 计算数组的小和 | 1 | https://mp.weixin.qq.com/s/0ih4W6nawzFUPSj3GOnYTQ |
| 300. 最长上升子序列 | 1 | https://leetcode-cn.com/problems/longest-increasing-subsequence |
| 199. 二叉树的右视图 | 1 | https://leetcode-cn.com/problems/binary-tree-right-side-view |
| 202. 快乐数 | 1 | https://leetcode-cn.com/problems/happy-number |
| 268. 缺失数字 | 1 | https://leetcode-cn.com/problems/missing-number |
| 121. 买卖股票的最佳时机 | 1 | https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock |
| 补充题4. 手撕快速排序 | 1 | |
| 102. 二叉树的层序遍历 | 1 | https://leetcode-cn.com/problems/binary-tree-level-order-traversal |
| 236. 二叉树的最近公共祖先 | 1 | https://leetcode-cn.com/problems/lowest-common-ancestor-of-a-binary-tree |
| 322. 零钱兑换 | 1 | https://leetcode-cn.com/problems/coin-change |
| 226. 翻转二叉树 | 1 | https://leetcode-cn.com/problems/invert-binary-tree |