算法 若想按部门/难度/题型筛选题目，请进入CodeTop查询 题目 出现次数 链接 206. 反转链表 5 https://leetcode-cn.com/problems/reverse-linked-list 53. 最大子序和 4 https://leetcode-cn.com/problems/maximum-subarray 1143. 最长公共子序列 3 https://leetcode-cn.com/problems/longest-common-subsequence 442. 数组中重复的数据 2 https://leetcode-cn.com/problems/find-all-duplicates-in-an-array 300. 最长上升子序列 2 https://leetcode-cn.com/problems/longest-increasing-subsequence 8. 字符串转换整数 (atoi) 2 https://leetcode-cn.com/problems/string-to-integer-atoi 215. 数组中的第K个最大元素 2 https://leetcode-cn.com/problems/kth-largest-element-in-an-array 121. 买卖股票的最佳时机 2 https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock 141. 环形链表 1 https://leetcode-cn.com/problems/linked-list-cycle 21. 合并两个有序链表 1 https://leetcode-cn.com/problems/merge-two-sorted-lists 494. 目标和 1 https://leetcode-cn.com/problems/target-sum 227. 基本计算器 II 1 https://leetcode-cn.com/problems/basic-calculator-ii 72. 编辑距离 1 https://leetcode-cn.com/problems/edit-distance 633. 平方数之和 1 https://leetcode-cn.com/problems/sum-of-square-numbers 125. 验证回文串 1 https://leetcode-cn.com/problems/valid-palindrome 152. 乘积最大子数组 1 https://leetcode-cn.com/problems/maximum-product-subarray 15. 三数之和 1 https://leetcode-cn.com/problems/3sum 105. 从前序与中序遍历序列构造二叉树 1 https://leetcode-cn.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal 148. 排序链表 1 https://leetcode-cn.com/problems/sort-list 239. 滑动窗口最大值 1 https://leetcode-cn.com/problems/sliding-window-maximum 22. 括号生成 1 https://leetcode-cn.com/problems/generate-parentheses 75. 颜色分类 1 https://leetcode-cn.com/problems/sort-colors 20. 有效的括号 1 https://leetcode-cn.com/problems/valid-parentheses 169. 多数元素 1 https://leetcode-cn.com/problems/majority-element 171. Excel表列序号 1 https://leetcode-cn.com/problems/excel-sheet-column-number 5. 最长回文子串 1 https://leetcode-cn.com/problems/longest-palindromic-substring 43. 字符串相乘 1 https://leetcode-cn.com/problems/multiply-strings 63. 不同路径 II 1 https://leetcode-cn.com/problems/unique-paths-ii 146. LRU缓存机制 1 https://leetcode-cn.com/problems/lru-cache 补充题6. 手撕堆排序 1 https://leetcode-cn.com/problems/sort-an-array 160. 相交链表 1 https://leetcode-cn.com/problems/intersection-of-two-linked-lists 补充题4. 手撕快速排序 1 https://leetcode-cn.com/problems/sort-an-array 113. 路径总和 II 1 https://leetcode-cn.com/problems/path-sum-ii