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1 | 1 | |题目|出现次数|链接| |
2 | 2 | |-|-|-| |
3 | 3 | |232. 用栈实现队列|3|https://leetcode-cn.com/problems/implement-queue-using-stacks| |
| 4 | +|101. 对称二叉树|1|https://leetcode-cn.com/problems/symmetric-tree| |
| 5 | +|33. 搜索旋转排序数组|1|https://leetcode-cn.com/problems/search-in-rotated-sorted-array| |
| 6 | +|121. 买卖股票的最佳时机|1|https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock| |
4 | 7 | |240. 搜索二维矩阵 II|1|https://leetcode-cn.com/problems/search-a-2d-matrix-ii| |
5 | 8 | |剑指 Offer 59 - II. 队列的最大值|1|https://leetcode-cn.com/problems/dui-lie-de-zui-da-zhi-lcof| |
| 9 | +|155. 最小栈|1|https://leetcode-cn.com/problems/min-stack| |
6 | 10 | |42. 接雨水|1|https://leetcode-cn.com/problems/trapping-rain-water| |
7 | 11 | |3. 无重复字符的最长子串|1|https://leetcode-cn.com/problems/longest-substring-without-repeating-characters| |
| 12 | +|5. 最长回文子串|1|https://leetcode-cn.com/problems/longest-palindromic-substring| |
8 | 13 | |92. 反转链表 II|1|https://leetcode-cn.com/problems/reverse-linked-list-ii| |
9 | 14 | |206. 反转链表|1|https://leetcode-cn.com/problems/reverse-linked-list| |
10 | 15 | |112. 路径总和|1|https://leetcode-cn.com/problems/path-sum| |
| 16 | +|718. 最长重复子数组|1|https://leetcode-cn.com/problems/maximum-length-of-repeated-subarray| |
11 | 17 | |297. 二叉树的序列化与反序列化|1|https://leetcode-cn.com/problems/serialize-and-deserialize-binary-tree| |
12 | 18 | |440. 字典序的第K小数字|1|https://leetcode-cn.com/problems/k-th-smallest-in-lexicographical-order| |
13 | 19 | |剑指 Offer 41. 数据流中的中位数|1|https://leetcode-cn.com/problems/shu-ju-liu-zhong-de-zhong-wei-shu-lcof| |
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16 | 22 | |226. 翻转二叉树|1|https://leetcode-cn.com/problems/invert-binary-tree| |
17 | 23 | |1201. 丑数 III|1|https://leetcode-cn.com/problems/ugly-number-iii| |
18 | 24 | |60. 第k个排列|1|https://leetcode-cn.com/problems/permutation-sequence| |
19 | | -|101. 对称二叉树|1|https://leetcode-cn.com/problems/symmetric-tree| |
20 | | -|121. 买卖股票的最佳时机|1|https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock| |
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