| 3. 无重复字符的最长子串 | 8 | https://leetcode-cn.com/problems/longest-substring-without-repeating-characters |
| 1. 两数之和 | 7 | https://leetcode-cn.com/problems/two-sum |
| 704. 二分查找 | 6 | https://leetcode-cn.com/problems/binary-search |
| 20. 有效的括号 | 6 | https://leetcode-cn.com/problems/valid-parentheses |
| 232. 用栈实现队列 | 5 | https://leetcode-cn.com/problems/implement-queue-using-stacks |
| 141. 环形链表 | 4 | https://leetcode-cn.com/problems/linked-list-cycle |
| 14. 最长公共前缀 | 4 | https://leetcode-cn.com/problems/longest-common-prefix |
| 46. 全排列 | 4 | https://leetcode-cn.com/problems/permutations |
| 7. 整数反转 | 4 | https://leetcode-cn.com/problems/reverse-integer |
| 53. 最大子序和 | 4 | https://leetcode-cn.com/problems/maximum-subarray |
| 136. 只出现一次的数字 | 4 | https://leetcode-cn.com/problems/single-number |
| 242. 有效的字母异位词 | 4 | https://leetcode-cn.com/problems/valid-anagram |
| 8. 字符串转换整数 (atoi) | 4 | https://leetcode-cn.com/problems/string-to-integer-atoi |
| 151. 翻转字符串里的单词 | 3 | https://leetcode-cn.com/problems/reverse-words-in-a-string |
| 468. 验证IP地址 | 3 | https://leetcode-cn.com/problems/validate-ip-address |
| 补充题14. 阿拉伯数字转中文数字 | 3 | |
| 剑指 Offer 53 - I. 在排序数组中查找数字 I | 3 | https://leetcode-cn.com/problems/zai-pai-xu-shu-zu-zhong-cha-zhao-shu-zi-lcof |
| 169. 多数元素 | 3 | https://leetcode-cn.com/problems/majority-element |
| 补充题4. 手撕快速排序 | 3 | https://leetcode-cn.com/problems/sort-an-array |
| 128. 最长连续序列 | 2 | https://leetcode-cn.com/problems/longest-consecutive-sequence |
| 83. 删除排序链表中的重复元素 | 2 | https://leetcode-cn.com/problems/remove-duplicates-from-sorted-list |
| 21. 合并两个有序链表 | 2 | https://leetcode-cn.com/problems/merge-two-sorted-lists |
| 88. 合并两个有序数组 | 2 | https://leetcode-cn.com/problems/merge-sorted-array |
| 226. 翻转二叉树 | 2 | https://leetcode-cn.com/problems/invert-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 |
| 718. 最长重复子数组 | 2 | https://leetcode-cn.com/problems/maximum-length-of-repeated-subarray |
| 76. 最小覆盖子串 | 2 | https://leetcode-cn.com/problems/minimum-window-substring |
| 239. 滑动窗口最大值 | 2 | https://leetcode-cn.com/problems/sliding-window-maximum |
| 剑指 Offer 57 - II. 和为s的连续正数序列 | 2 | https://leetcode-cn.com/problems/he-wei-sde-lian-xu-zheng-shu-xu-lie-lcof |
| 165. 比较版本号 | 2 | https://leetcode-cn.com/problems/compare-version-numbers |
| 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 |
| 876. 链表的中间结点 | 1 | https://leetcode-cn.com/problems/middle-of-the-linked-list |
| 70. 爬楼梯 | 1 | https://leetcode-cn.com/problems/climbing-stairs |
| 796. 旋转字符串 | 1 | https://leetcode-cn.com/problems/rotate-string |
| 72. 编辑距离 | 1 | https://leetcode-cn.com/problems/edit-distance |
| 460. LFU缓存 | 1 | https://leetcode-cn.com/problems/lfu-cache |
| 106. 从中序与后序遍历序列构造二叉树 | 1 | https://leetcode-cn.com/problems/construct-binary-tree-from-inorder-and-postorder-traversal |
| 231. 2的幂 | 1 | https://leetcode-cn.com/problems/power-of-two |
| 415. 字符串相加 | 1 | https://leetcode-cn.com/problems/add-strings |
| 50. Pow(x, n) | 1 | https://leetcode-cn.com/problems/powx-n |
| 40. 组合总和 II | 1 | https://leetcode-cn.com/problems/combination-sum-ii |
| 628. 三个数的最大乘积 | 1 | https://leetcode-cn.com/problems/maximum-product-of-three-numbers |
| 215. 数组中的第K个最大元素 | 1 | https://leetcode-cn.com/problems/kth-largest-element-in-an-array |
| 剑指 Offer 61. 扑克牌中的顺子 | 1 | https://leetcode-cn.com/problems/bu-ke-pai-zhong-de-shun-zi-lcof |
| 剑指 Offer 45. 把数组排成最小的数 | 1 | https://leetcode-cn.com/problems/ba-shu-zu-pai-cheng-zui-xiao-de-shu-lcof |
| 240. 搜索二维矩阵 II | 1 | https://leetcode-cn.com/problems/search-a-2d-matrix-ii |
| 23. 合并K个排序链表 | 1 | https://leetcode-cn.com/problems/merge-k-sorted-lists |
| 9. 回文数 | 1 | https://leetcode-cn.com/problems/palindrome-number |
| 剑指 Offer 10- I. 斐波那契数列 | 1 | https://leetcode-cn.com/problems/fei-bo-na-qi-shu-lie-lcof |
| 26. 删除排序数组中的重复项 | 1 | https://leetcode-cn.com/problems/remove-duplicates-from-sorted-array |
| 283. 移动零 | 1 | https://leetcode-cn.com/problems/move-zeroes |
| 34. 在排序数组中查找元素的第一个和最后一个位置 | 1 | https://leetcode-cn.com/problems/find-first-and-last-position-of-element-in-sorted-array |
| 125. 验证回文串 | 1 | https://leetcode-cn.com/problems/valid-palindrome |
| 28. 实现 strStr() | 1 | https://leetcode-cn.com/problems/implement-strstr |
| 206. 反转链表 | 1 | https://leetcode-cn.com/problems/reverse-linked-list |
| 101. 对称二叉树 | 1 | https://leetcode-cn.com/problems/symmetric-tree |
| 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 |
| 32. 最长有效括号 | 1 | https://leetcode-cn.com/problems/longest-valid-parentheses |
| 15. 三数之和 | 1 | https://leetcode-cn.com/problems/3sum |