| 232. 用栈实现队列 | 10 | https://leetcode-cn.com/problems/implement-queue-using-stacks |
| 160. 相交链表 | 8 | https://leetcode-cn.com/problems/intersection-of-two-linked-lists |
| 1. 两数之和 | 7 | https://leetcode-cn.com/problems/two-sum |
| 21. 合并两个有序链表 | 7 | https://leetcode-cn.com/problems/merge-two-sorted-lists |
| 179. 最大数 | 5 | https://leetcode-cn.com/problems/largest-number |
| 704. 二分查找 | 5 | https://leetcode-cn.com/problems/binary-search |
| 146. LRU缓存机制 | 5 | https://leetcode-cn.com/problems/lru-cache |
| 226. 翻转二叉树 | 4 | https://leetcode-cn.com/problems/invert-binary-tree |
| 206. 反转链表 | 4 | https://leetcode-cn.com/problems/reverse-linked-list |
| 2. 两数相加 | 4 | https://leetcode-cn.com/problems/add-two-numbers |
| 82. 删除排序链表中的重复元素 II | 4 | https://leetcode-cn.com/problems/remove-duplicates-from-sorted-list-ii |
| 72. 编辑距离 | 3 | https://leetcode-cn.com/problems/edit-distance |
| 15. 三数之和 | 3 | https://leetcode-cn.com/problems/3sum |
| 94. 二叉树的中序遍历 | 3 | https://leetcode-cn.com/problems/binary-tree-inorder-traversal |
| 34. 在排序数组中查找元素的第一个和最后一个位置 | 3 | https://leetcode-cn.com/problems/find-first-and-last-position-of-element-in-sorted-array |
| 102. 二叉树的层序遍历 | 3 | https://leetcode-cn.com/problems/binary-tree-level-order-traversal |
| 3. 无重复字符的最长子串 | 3 | https://leetcode-cn.com/problems/longest-substring-without-repeating-characters |
| 117. 填充每个节点的下一个右侧节点指针 II | 3 | https://leetcode-cn.com/problems/populating-next-right-pointers-in-each-node-ii |
| 76. 最小覆盖子串 | 3 | https://leetcode-cn.com/problems/minimum-window-substring |
| 445. 两数相加 II | 3 | https://leetcode-cn.com/problems/add-two-numbers-ii |
| 19. 删除链表的倒数第N个节点 | 2 | https://leetcode-cn.com/problems/remove-nth-node-from-end-of-list |
| 补充题5. 手撕归并排序 | 2 | https://leetcode-cn.com/problems/sort-an-array |
| 105. 从前序与中序遍历序列构造二叉树 | 2 | https://leetcode-cn.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal |
| 199. 二叉树的右视图 | 2 | https://leetcode-cn.com/problems/binary-tree-right-side-view |
| 141. 环形链表 | 2 | https://leetcode-cn.com/problems/linked-list-cycle |
| 136. 只出现一次的数字 | 2 | https://leetcode-cn.com/problems/single-number |
| 剑指 Offer 51. 数组中的逆序对 | 2 | https://leetcode-cn.com/problems/shu-zu-zhong-de-ni-xu-dui-lcof |
| 113. 路径总和 II | 2 | https://leetcode-cn.com/problems/path-sum-ii |
| 405. 数字转换为十六进制数 | 2 | https://leetcode-cn.com/problems/convert-a-number-to-hexadecimal |
| 215. 数组中的第K个最大元素 | 2 | https://leetcode-cn.com/problems/kth-largest-element-in-an-array |
| 110. 平衡二叉树 | 2 | https://leetcode-cn.com/problems/balanced-binary-tree |
| 剑指 Offer 22. 链表中倒数第k个节点 | 2 | https://leetcode-cn.com/problems/lian-biao-zhong-dao-shu-di-kge-jie-dian-lcof |
| 239. 滑动窗口最大值 | 2 | https://leetcode-cn.com/problems/sliding-window-maximum |
| 145. 二叉树的后序遍历 | 2 | https://leetcode-cn.com/problems/binary-tree-postorder-traversal |
| 25. K 个一组翻转链表 | 2 | https://leetcode-cn.com/problems/reverse-nodes-in-k-group |
| 236. 二叉树的最近公共祖先 | 2 | https://leetcode-cn.com/problems/lowest-common-ancestor-of-a-binary-tree |
| 23. 合并K个排序链表 | 1 | https://leetcode-cn.com/problems/merge-k-sorted-lists |
| 53. 最大子序和 | 1 | https://leetcode-cn.com/problems/maximum-subarray |
| 718. 最长重复子数组 | 1 | https://leetcode-cn.com/problems/maximum-length-of-repeated-subarray |
| 378. 有序矩阵中第K小的元素 | 1 | https://leetcode-cn.com/problems/kth-smallest-element-in-a-sorted-matrix |
| 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 |
| 295. 数据流的中位数 | 1 | https://leetcode-cn.com/problems/find-median-from-data-stream |
| 142. 环形链表 II | 1 | https://leetcode-cn.com/problems/linked-list-cycle-ii |
| 144. 二叉树的前序遍历 | 1 | https://leetcode-cn.com/problems/binary-tree-preorder-traversal |
| 42. 接雨水 | 1 | https://leetcode-cn.com/problems/trapping-rain-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 |
| 54. 螺旋矩阵 | 1 | https://leetcode-cn.com/problems/spiral-matrix |
| 114. 二叉树展开为链表 | 1 | https://leetcode-cn.com/problems/flatten-binary-tree-to-linked-list |
| 153. 寻找旋转排序数组中的最小值 | 1 | https://leetcode-cn.com/problems/find-minimum-in-rotated-sorted-array |
| 剑指 Offer 10- I. 斐波那契数列 | 1 | https://leetcode-cn.com/problems/fei-bo-na-qi-shu-lie-lcof |
| 88. 合并两个有序数组 | 1 | https://leetcode-cn.com/problems/merge-sorted-array |
| 5. 最长回文子串 | 1 | https://leetcode-cn.com/problems/longest-palindromic-substring |
| 230. 二叉搜索树中第K小的元素 | 1 | https://leetcode-cn.com/problems/kth-smallest-element-in-a-bst |
| 300. 最长上升子序列 | 1 | https://leetcode-cn.com/problems/longest-increasing-subsequence |
| 415. 字符串相加 | 1 | https://leetcode-cn.com/problems/add-strings |
| 138. 复制带随机指针的链表 | 1 | https://leetcode-cn.com/problems/copy-list-with-random-pointer |
| 剑指 Offer 62. 圆圈中最后剩下的数字 | 1 | https://leetcode-cn.com/problems/yuan-quan-zhong-zui-hou-sheng-xia-de-shu-zi-lcof |
| 98. 验证二叉搜索树 | 1 | https://leetcode-cn.com/problems/validate-binary-search-tree |
| 402. 移掉K位数字 | 1 | https://leetcode-cn.com/problems/remove-k-digits |
| 208. 实现 Trie (前缀树) | 1 | https://leetcode-cn.com/problems/implement-trie-prefix-tree |
| 528. 按权重随机选择 | 1 | https://leetcode-cn.com/problems/random-pick-with-weight |
| 680. 验证回文字符串 Ⅱ | 1 | https://leetcode-cn.com/problems/valid-palindrome-ii |
| 349. 两个数组的交集 | 1 | https://leetcode-cn.com/problems/intersection-of-two-arrays |
| 443. 压缩字符串 | 1 | https://leetcode-cn.com/problems/string-compression |
| 225. 用队列实现栈 | 1 | https://leetcode-cn.com/problems/implement-stack-using-queues |
| 83. 删除排序链表中的重复元素 | 1 | https://leetcode-cn.com/problems/remove-duplicates-from-sorted-list |
| 92. 反转链表 II | 1 | https://leetcode-cn.com/problems/reverse-linked-list-ii |
| 97. 交错字符串 | 1 | https://leetcode-cn.com/problems/interleaving-string |
| 227. 基本计算器 II | 1 | https://leetcode-cn.com/problems/basic-calculator-ii |
| 169. 多数元素 | 1 | https://leetcode-cn.com/problems/majority-element |
| 20. 有效的括号 | 1 | https://leetcode-cn.com/problems/valid-parentheses |
| 139. 单词拆分 | 1 | https://leetcode-cn.com/problems/word-break |
| 547. 省份数量（原朋友圈） | 1 | https://leetcode-cn.com/problems/number-of-provinces |
| 26. 删除排序数组中的重复项 | 1 | https://leetcode-cn.com/problems/remove-duplicates-from-sorted-array |
| 369. 给单链表加一 | 1 | https://leetcode-cn.com/problems/plus-one-linked-list |
| 补充题4. 手撕快速排序 | 1 | https://leetcode-cn.com/problems/sort-an-array |
| 101. 对称二叉树 | 1 | https://leetcode-cn.com/problems/symmetric-tree |
| 62. 不同路径 | 1 | https://leetcode-cn.com/problems/unique-paths |
| 513. 找树左下角的值 | 1 | https://leetcode-cn.com/problems/find-bottom-left-tree-value |
| 79. 单词搜索 | 1 | https://leetcode-cn.com/problems/word-search |
| 283. 移动零 | 1 | https://leetcode-cn.com/problems/move-zeroes |
| 48. 旋转图像 | 1 | https://leetcode-cn.com/problems/rotate-image |
| 670. 最大交换 | 1 | https://leetcode-cn.com/problems/maximum-swap |
| 703. 数据流中的第K大元素 | 1 | https://leetcode-cn.com/problems/kth-largest-element-in-a-stream |
| 剑指 Offer 27. 二叉树的镜像 | 1 | https://leetcode-cn.com/problems/er-cha-shu-de-jing-xiang-lcof |
| 241. 为运算表达式设计优先级 | 1 | https://leetcode-cn.com/problems/different-ways-to-add-parentheses |
| 746. 使用最小花费爬楼梯 | 1 | https://leetcode-cn.com/problems/min-cost-climbing-stairs |
| 187. 重复的DNA序列 | 1 | https://leetcode-cn.com/problems/repeated-dna-sequences |
| 面试题 01.06. 字符串压缩 | 1 | https://leetcode-cn.com/problems/compress-string-lcci |
| 958. 二叉树的完全性检验 | 1 | https://leetcode-cn.com/problems/check-completeness-of-a-binary-tree |
| 剑指 Offer 33. 二叉搜索树的后序遍历序列 | 1 | https://leetcode-cn.com/problems/er-cha-sou-suo-shu-de-hou-xu-bian-li-xu-lie-lcof |
| 727. 最小窗口子序列 | 1 | https://leetcode-cn.com/problems/minimum-window-subsequence |
| 118. 杨辉三角 | 1 | https://leetcode-cn.com/problems/pascals-triangle |
| 392. 判断子序列 | 1 | https://leetcode-cn.com/problems/is-subsequence |
| 73. 矩阵置零 | 1 | https://leetcode-cn.com/problems/set-matrix-zeroes |
| 47. 全排列 II | 1 | https://leetcode-cn.com/problems/permutations-ii |
| 31. 下一个排列 | 1 | https://leetcode-cn.com/problems/next-permutation |
| 151. 翻转字符串里的单词 | 1 | https://leetcode-cn.com/problems/reverse-words-in-a-string |
| 200. 岛屿数量 | 1 | https://leetcode-cn.com/problems/number-of-islands |
| 剑指 Offer 48. 最长不含重复字符的子字符串 | 1 | https://leetcode-cn.com/problems/zui-chang-bu-han-zhong-fu-zi-fu-de-zi-zi-fu-chuan-lcof |
| 1038. 从二叉搜索树到更大和树 | 1 | https://leetcode-cn.com/problems/binary-search-tree-to-greater-sum-tree |
| 123. 买卖股票的最佳时机 III | 1 | https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock-iii |
| 257. 二叉树的所有路径 | 1 | https://leetcode-cn.com/problems/binary-tree-paths |
| 75. 颜色分类 | 1 | https://leetcode-cn.com/problems/sort-colors |
| 628. 三个数的最大乘积 | 1 | https://leetcode-cn.com/problems/maximum-product-of-three-numbers |