客户端 题目 出现次数 链接 206. 反转链表 6 https://leetcode-cn.com/problems/reverse-linked-list 142. 环形链表 II 3 https://leetcode-cn.com/problems/linked-list-cycle-ii 21. 合并两个有序链表 2 https://leetcode-cn.com/problems/merge-two-sorted-lists 78. 子集 2 https://leetcode-cn.com/problems/subsets 103. 二叉树的锯齿形层次遍历 2 https://leetcode-cn.com/problems/binary-tree-zigzag-level-order-traversal 144. 二叉树的前序遍历 2 https://leetcode-cn.com/problems/binary-tree-preorder-traversal 110. 平衡二叉树 2 https://leetcode-cn.com/problems/balanced-binary-tree 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 102. 二叉树的层序遍历 2 https://leetcode-cn.com/problems/binary-tree-level-order-traversal 704. 二分查找 2 https://leetcode-cn.com/problems/binary-search 300. 最长上升子序列 1 https://leetcode-cn.com/problems/longest-increasing-subsequence 121. 买卖股票的最佳时机 1 https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock 1. 两数之和 1 https://leetcode-cn.com/problems/two-sum 283. 移动零 1 https://leetcode-cn.com/problems/move-zeroes 415. 字符串相加 1 https://leetcode-cn.com/problems/add-strings 200. 岛屿数量 1 https://leetcode-cn.com/problems/number-of-islands 3. 无重复字符的最长子串 1 https://leetcode-cn.com/problems/longest-substring-without-repeating-characters 11. 盛最多水的容器 1 https://leetcode-cn.com/problems/container-with-most-water 167. 两数之和 II - 输入有序数组 1 https://leetcode-cn.com/problems/two-sum-ii-input-array-is-sorted 470. 用 Rand7() 实现 Rand10() 1 https://leetcode-cn.com/problems/implement-rand10-using-rand7 189. 旋转数组 1 https://leetcode-cn.com/problems/rotate-array 459. 重复的子字符串 1 https://leetcode-cn.com/problems/repeated-substring-pattern 129. 求根到叶子节点数字之和 1 https://leetcode-cn.com/problems/sum-root-to-leaf-numbers 312. 戳气球 1 https://leetcode-cn.com/problems/burst-balloons 69. x 的平方根 1 https://leetcode-cn.com/problems/sqrtx 718. 最长重复子数组 1 https://leetcode-cn.com/problems/maximum-length-of-repeated-subarray 24. 两两交换链表中的节点 1 https://leetcode-cn.com/problems/swap-nodes-in-pairs 146. LRU缓存机制 1 https://leetcode-cn.com/problems/lru-cache 剑指 Offer 64. 求1+2+…+n 1 https://leetcode-cn.com/problems/qiu-12n-lcof 70. 爬楼梯 1 https://leetcode-cn.com/problems/climbing-stairs 剑指 Offer 24. 反转链表 1 https://leetcode-cn.com/problems/fan-zhuan-lian-biao-lcof 232. 用栈实现队列 1 https://leetcode-cn.com/problems/implement-queue-using-stacks 919. 完全二叉树插入器 1 https://leetcode-cn.com/problems/complete-binary-tree-inserter 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 109. 有序链表转换二叉搜索树 1 https://leetcode-cn.com/problems/convert-sorted-list-to-binary-search-tree 104. 二叉树的最大深度 1 https://leetcode-cn.com/problems/maximum-depth-of-binary-tree 53. 最大子序和 1 https://leetcode-cn.com/problems/maximum-subarray 补充题4. 手撕快速排序 1