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 补充题4. 手撕快速排序 5 https://leetcode-cn.com/problems/sort-an-array 121. 买卖股票的最佳时机 4 https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock 215. 数组中的第K个最大元素 4 https://leetcode-cn.com/problems/kth-largest-element-in-an-array 128. 最长连续序列 2 https://leetcode-cn.com/problems/longest-consecutive-sequence 1143. 最长公共子序列 2 https://leetcode-cn.com/problems/longest-common-subsequence 498. 对角线遍历 2 https://leetcode-cn.com/problems/diagonal-traverse 剑指 Offer 65. 不用加减乘除做加法 2 https://leetcode-cn.com/problems/bu-yong-jia-jian-cheng-chu-zuo-jia-fa-lcof 53. 最大子序和 2 https://leetcode-cn.com/problems/maximum-subarray 2. 两数相加 2 https://leetcode-cn.com/problems/add-two-numbers 718. 最长重复子数组 2 https://leetcode-cn.com/problems/maximum-length-of-repeated-subarray 21. 合并两个有序链表 1 https://leetcode-cn.com/problems/merge-two-sorted-lists 560. 和为K的子数组 1 https://leetcode-cn.com/problems/subarray-sum-equals-k 5. 最长回文子串 1 https://leetcode-cn.com/problems/longest-palindromic-substring 20. 有效的括号 1 https://leetcode-cn.com/problems/valid-parentheses 94. 二叉树的中序遍历 1 https://leetcode-cn.com/problems/binary-tree-inorder-traversal 104. 二叉树的最大深度 1 https://leetcode-cn.com/problems/maximum-depth-of-binary-tree 69. x 的平方根 1 https://leetcode-cn.com/problems/sqrtx 240. 搜索二维矩阵 II 1 https://leetcode-cn.com/problems/search-a-2d-matrix-ii 76. 最小覆盖子串 1 https://leetcode-cn.com/problems/minimum-window-substring 143. 重排链表 1 https://leetcode-cn.com/problems/reorder-list 103. 二叉树的锯齿形层次遍历 1 https://leetcode-cn.com/problems/binary-tree-zigzag-level-order-traversal 208. 实现 Trie (前缀树) 1 https://leetcode-cn.com/problems/implement-trie-prefix-tree 3. 无重复字符的最长子串 1 https://leetcode-cn.com/problems/longest-substring-without-repeating-characters 50. Pow(x, n) 1 https://leetcode-cn.com/problems/powx-n 7. 整数反转 1 https://leetcode-cn.com/problems/reverse-integer 410. 分割数组的最大值 1 https://leetcode-cn.com/problems/split-array-largest-sum 25. K 个一组翻转链表 1 https://leetcode-cn.com/problems/reverse-nodes-in-k-group 146. LRU缓存机制 1 https://leetcode-cn.com/problems/lru-cache 15. 三数之和 1 https://leetcode-cn.com/problems/3sum 226. 翻转二叉树 1 https://leetcode-cn.com/problems/invert-binary-tree 剑指 Offer 40. 最小的k个数 1 https://leetcode-cn.com/problems/zui-xiao-de-kge-shu-lcof 73. 矩阵置零 1 https://leetcode-cn.com/problems/set-matrix-zeroes 695. 岛屿的最大面积 1 https://leetcode-cn.com/problems/max-area-of-island 面试题 17.24. 最大子矩阵 1 https://leetcode-cn.com/problems/max-submatrix-lcci 300. 最长上升子序列 1 https://leetcode-cn.com/problems/longest-increasing-subsequence 39. 组合总和 1 https://leetcode-cn.com/problems/combination-sum 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