测试 题目 出现次数 链接 3. 无重复字符的最长子串 16 https://leetcode-cn.com/problems/longest-substring-without-repeating-characters 20. 有效的括号 9 https://leetcode-cn.com/problems/valid-parentheses 169. 多数元素 7 https://leetcode-cn.com/problems/majority-element 206. 反转链表 7 https://leetcode-cn.com/problems/reverse-linked-list 415. 字符串相加 6 https://leetcode-cn.com/problems/add-strings 78. 子集 5 https://leetcode-cn.com/problems/subsets 1. 两数之和 5 https://leetcode-cn.com/problems/two-sum 64. 最小路径和 4 https://leetcode-cn.com/problems/minimum-path-sum 70. 爬楼梯 4 https://leetcode-cn.com/problems/climbing-stairs 94. 二叉树的中序遍历 4 https://leetcode-cn.com/problems/binary-tree-inorder-traversal 25. K 个一组翻转链表 4 https://leetcode-cn.com/problems/reverse-nodes-in-k-group 39. 组合总和 4 https://leetcode-cn.com/problems/combination-sum 1143. 最长公共子序列 4 https://leetcode-cn.com/problems/longest-common-subsequence 179. 最大数 3 https://leetcode-cn.com/problems/largest-number 468. 验证IP地址 3 https://leetcode-cn.com/problems/validate-ip-address 239. 滑动窗口最大值 3 https://leetcode-cn.com/problems/sliding-window-maximum 剑指 Offer 61. 扑克牌中的顺子 3 https://leetcode-cn.com/problems/bu-ke-pai-zhong-de-shun-zi-lcof 110. 平衡二叉树 3 https://leetcode-cn.com/problems/balanced-binary-tree 62. 不同路径 3 https://leetcode-cn.com/problems/unique-paths 160. 相交链表 3 https://leetcode-cn.com/problems/intersection-of-two-linked-lists 15. 三数之和 3 https://leetcode-cn.com/problems/3sum 141. 环形链表 3 https://leetcode-cn.com/problems/linked-list-cycle 125. 验证回文串 2 https://leetcode-cn.com/problems/valid-palindrome 26. 删除排序数组中的重复项 2 https://leetcode-cn.com/problems/remove-duplicates-from-sorted-array 242. 有效的字母异位词 2 https://leetcode-cn.com/problems/valid-anagram 剑指 Offer 10- II. 青蛙跳台阶问题 2 https://leetcode-cn.com/problems/qing-wa-tiao-tai-jie-wen-ti-lcof 剑指 Offer 21. 调整数组顺序使奇数位于偶数前面 2 https://leetcode-cn.com/problems/diao-zheng-shu-zu-shun-xu-shi-qi-shu-wei-yu-ou-shu-qian-mian-lcof 5. 最长回文子串 2 https://leetcode-cn.com/problems/longest-palindromic-substring 718. 最长重复子数组 2 https://leetcode-cn.com/problems/maximum-length-of-repeated-subarray 146. LRU缓存机制 2 https://leetcode-cn.com/problems/lru-cache 83. 删除排序链表中的重复元素 2 https://leetcode-cn.com/problems/remove-duplicates-from-sorted-list 14. 最长公共前缀 2 https://leetcode-cn.com/problems/longest-common-prefix 704. 二分查找 2 https://leetcode-cn.com/problems/binary-search 88. 合并两个有序数组 2 https://leetcode-cn.com/problems/merge-sorted-array 42. 接雨水 2 https://leetcode-cn.com/problems/trapping-rain-water 142. 环形链表 II 2 https://leetcode-cn.com/problems/linked-list-cycle-ii 268. 缺失数字 2 https://leetcode-cn.com/problems/missing-number 543. 二叉树的直径 2 https://leetcode-cn.com/problems/diameter-of-binary-tree 32. 最长有效括号 2 https://leetcode-cn.com/problems/longest-valid-parentheses 344. 反转字符串 1 https://leetcode-cn.com/problems/reverse-string 9. 回文数 1 https://leetcode-cn.com/problems/palindrome-number 680. 验证回文字符串 Ⅱ 1 https://leetcode-cn.com/problems/valid-palindrome-ii 补充题1. 排序奇升偶降链表 1 https://mp.weixin.qq.com/s/377FfqvpY8NwMInhpoDgsw 796. 旋转字符串 1 https://leetcode-cn.com/problems/rotate-string 234. 回文链表 1 https://leetcode-cn.com/problems/palindrome-linked-list 124. 二叉树中的最大路径和 1 https://leetcode-cn.com/problems/binary-tree-maximum-path-sum 19. 删除链表的倒数第N个节点 1 https://leetcode-cn.com/problems/remove-nth-node-from-end-of-list 498. 对角线遍历 1 https://leetcode-cn.com/problems/diagonal-traverse 443. 压缩字符串 1 https://leetcode-cn.com/problems/string-compression 76. 最小覆盖子串 1 https://leetcode-cn.com/problems/minimum-window-substring 79. 单词搜索 1 https://leetcode-cn.com/problems/word-search 300. 最长上升子序列 1 https://leetcode-cn.com/problems/longest-increasing-subsequence 22. 括号生成 1 https://leetcode-cn.com/problems/generate-parentheses 143. 重排链表 1 https://leetcode-cn.com/problems/reorder-list 51. N皇后 1 https://leetcode-cn.com/problems/n-queens 236. 二叉树的最近公共祖先 1 https://leetcode-cn.com/problems/lowest-common-ancestor-of-a-binary-tree 240. 搜索二维矩阵 II 1 https://leetcode-cn.com/problems/search-a-2d-matrix-ii 121. 买卖股票的最佳时机 1 https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock 剑指 Offer 22. 链表中倒数第k个节点 1 https://leetcode-cn.com/problems/lian-biao-zhong-dao-shu-di-kge-jie-dian-lcof 41. 缺失的第一个正数 1 https://leetcode-cn.com/problems/first-missing-positive 113. 路径总和 II 1 https://leetcode-cn.com/problems/path-sum-ii 122. 买卖股票的最佳时机 II 1 https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock-ii 200. 岛屿数量 1 https://leetcode-cn.com/problems/number-of-islands 49. 字母异位词分组 1 https://leetcode-cn.com/problems/group-anagrams 557. 反转字符串中的单词 III 1 https://leetcode-cn.com/problems/reverse-words-in-a-string-iii 198. 打家劫舍 1 https://leetcode-cn.com/problems/house-robber 56. 合并区间 1 https://leetcode-cn.com/problems/merge-intervals 151. 翻转字符串里的单词 1 https://leetcode-cn.com/problems/reverse-words-in-a-string 862. 和至少为 K 的最短子数组 1 https://leetcode-cn.com/problems/shortest-subarray-with-sum-at-least-k 53. 最大子序和 1 https://leetcode-cn.com/problems/maximum-subarray 103. 二叉树的锯齿形层次遍历 1 https://leetcode-cn.com/problems/binary-tree-zigzag-level-order-traversal 剑指 Offer 39. 数组中出现次数超过一半的数字 1 https://leetcode-cn.com/problems/shu-zu-zhong-chu-xian-ci-shu-chao-guo-yi-ban-de-shu-zi-lcof 215. 数组中的第K个最大元素 1 https://leetcode-cn.com/problems/kth-largest-element-in-an-array 97. 交错字符串 1 https://leetcode-cn.com/problems/interleaving-string 21. 合并两个有序链表 1 https://leetcode-cn.com/problems/merge-two-sorted-lists 102. 二叉树的层序遍历 1 https://leetcode-cn.com/problems/binary-tree-level-order-traversal 162. 寻找峰值 1 https://leetcode-cn.com/problems/find-peak-element 154. 寻找旋转排序数组中的最小值 II 1 https://leetcode-cn.com/problems/find-minimum-in-rotated-sorted-array-ii 405. 数字转换为十六进制数 1 https://leetcode-cn.com/problems/convert-a-number-to-hexadecimal 958. 二叉树的完全性检验 1 https://leetcode-cn.com/problems/check-completeness-of-a-binary-tree 350. 两个数组的交集 II 1 https://leetcode-cn.com/problems/intersection-of-two-arrays-ii 232. 用栈实现队列 1 https://leetcode-cn.com/problems/implement-queue-using-stacks 31. 下一个排列 1 https://leetcode-cn.com/problems/next-permutation 459. 重复的子字符串 1 https://leetcode-cn.com/problems/repeated-substring-pattern 1201. 丑数 III 1 https://leetcode-cn.com/problems/ugly-number-iii 224. 基本计算器 1 https://leetcode-cn.com/problems/basic-calculator