后端

April 15, 2021 · View on GitHub

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
146. LRU缓存机制32https://leetcode-cn.com/problems/lru-cache
206. 反转链表30https://leetcode-cn.com/problems/reverse-linked-list
补充题4. 手撕快速排序24https://leetcode-cn.com/problems/sort-an-array
21. 合并两个有序链表18https://leetcode-cn.com/problems/merge-two-sorted-lists
470. 用 Rand7() 实现 Rand10()15https://leetcode-cn.com/problems/implement-rand10-using-rand7
234. 回文链表14https://leetcode-cn.com/problems/palindrome-linked-list
8. 字符串转换整数 (atoi)13https://leetcode-cn.com/problems/string-to-integer-atoi
53. 最大子序和12https://leetcode-cn.com/problems/maximum-subarray
460. LFU缓存12https://leetcode-cn.com/problems/lfu-cache
215. 数组中的第K个最大元素10https://leetcode-cn.com/problems/kth-largest-element-in-an-array
153. 寻找旋转排序数组中的最小值10https://leetcode-cn.com/problems/find-minimum-in-rotated-sorted-array
3. 无重复字符的最长子串10https://leetcode-cn.com/problems/longest-substring-without-repeating-characters
704. 二分查找10https://leetcode-cn.com/problems/binary-search
415. 字符串相加10https://leetcode-cn.com/problems/add-strings
补充题6. 手撕堆排序9https://leetcode-cn.com/problems/sort-an-array
剑指 Offer 54. 二叉搜索树的第k大节点9https://leetcode-cn.com/problems/er-cha-sou-suo-shu-de-di-kda-jie-dian-lcof
160. 相交链表8https://leetcode-cn.com/problems/intersection-of-two-linked-lists
141. 环形链表8https://leetcode-cn.com/problems/linked-list-cycle
151. 翻转字符串里的单词8https://leetcode-cn.com/problems/reverse-words-in-a-string
4. 寻找两个正序数组的中位数7https://leetcode-cn.com/problems/median-of-two-sorted-arrays
42. 接雨水7https://leetcode-cn.com/problems/trapping-rain-water
102. 二叉树的层序遍历7https://leetcode-cn.com/problems/binary-tree-level-order-traversal
144. 二叉树的前序遍历7https://leetcode-cn.com/problems/binary-tree-preorder-traversal
300. 最长上升子序列6https://leetcode-cn.com/problems/longest-increasing-subsequence
110. 平衡二叉树6https://leetcode-cn.com/problems/balanced-binary-tree
2. 两数相加6https://leetcode-cn.com/problems/add-two-numbers
70. 爬楼梯6https://leetcode-cn.com/problems/climbing-stairs
213. 打家劫舍 II6https://leetcode-cn.com/problems/house-robber-ii
5. 最长回文子串6https://leetcode-cn.com/problems/longest-palindromic-substring
494. 目标和6https://leetcode-cn.com/problems/target-sum
15. 三数之和6https://leetcode-cn.com/problems/3sum
1. 两数之和5https://leetcode-cn.com/problems/two-sum
239. 滑动窗口最大值5https://leetcode-cn.com/problems/sliding-window-maximum
136. 只出现一次的数字5https://leetcode-cn.com/problems/single-number
25. K 个一组翻转链表5https://leetcode-cn.com/problems/reverse-nodes-in-k-group
232. 用栈实现队列5https://leetcode-cn.com/problems/implement-queue-using-stacks
155. 最小栈5https://leetcode-cn.com/problems/min-stack
104. 二叉树的最大深度5https://leetcode-cn.com/problems/maximum-depth-of-binary-tree
剑指 Offer 22. 链表中倒数第k个节点5https://leetcode-cn.com/problems/lian-biao-zhong-dao-shu-di-kge-jie-dian-lcof
322. 零钱兑换5https://leetcode-cn.com/problems/coin-change
525. 连续数组5https://leetcode-cn.com/problems/contiguous-array
169. 多数元素4https://leetcode-cn.com/problems/majority-element
236. 二叉树的最近公共祖先4https://leetcode-cn.com/problems/lowest-common-ancestor-of-a-binary-tree
328. 奇偶链表4https://leetcode-cn.com/problems/odd-even-linked-list
9. 回文数4https://leetcode-cn.com/problems/palindrome-number
112. 路径总和4https://leetcode-cn.com/problems/path-sum
142. 环形链表 II4https://leetcode-cn.com/problems/linked-list-cycle-ii
54. 螺旋矩阵4https://leetcode-cn.com/problems/spiral-matrix
240. 搜索二维矩阵 II4https://leetcode-cn.com/problems/search-a-2d-matrix-ii
20. 有效的括号4https://leetcode-cn.com/problems/valid-parentheses
706. 设计哈希映射4https://leetcode-cn.com/problems/design-hashmap
678. 有效的括号字符串4https://leetcode-cn.com/problems/valid-parenthesis-string
补充题5. 手撕归并排序4https://leetcode-cn.com/problems/sort-an-array
31. 下一个排列4https://leetcode-cn.com/problems/next-permutation
33. 搜索旋转排序数组4https://leetcode-cn.com/problems/search-in-rotated-sorted-array
199. 二叉树的右视图4https://leetcode-cn.com/problems/binary-tree-right-side-view
887. 鸡蛋掉落4https://leetcode-cn.com/problems/super-egg-drop
46. 全排列4https://leetcode-cn.com/problems/permutations
88. 合并两个有序数组4https://leetcode-cn.com/problems/merge-sorted-array
23. 合并K个排序链表3https://leetcode-cn.com/problems/merge-k-sorted-lists
189. 旋转数组3https://leetcode-cn.com/problems/rotate-array
59. 螺旋矩阵 II3https://leetcode-cn.com/problems/spiral-matrix-ii
43. 字符串相乘3https://leetcode-cn.com/problems/multiply-strings
384. 打乱数组3https://leetcode-cn.com/problems/shuffle-an-array
172. 阶乘后的零3https://leetcode-cn.com/problems/factorial-trailing-zeroes
227. 基本计算器 II3https://leetcode-cn.com/problems/basic-calculator-ii
718. 最长重复子数组3https://leetcode-cn.com/problems/maximum-length-of-repeated-subarray
394. 字符串解码3https://leetcode-cn.com/problems/decode-string
69. x 的平方根3https://leetcode-cn.com/problems/sqrtx
148. 排序链表3https://leetcode-cn.com/problems/sort-list
143. 重排链表3https://leetcode-cn.com/problems/reorder-list
121. 买卖股票的最佳时机2https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock
37. 解数独2https://leetcode-cn.com/problems/sudoku-solver
剑指 Offer 42. 连续子数组的最大和2https://leetcode-cn.com/problems/lian-xu-zi-shu-zu-de-zui-da-he-lcof
287. 寻找重复数2https://leetcode-cn.com/problems/find-the-duplicate-number
129. 求根到叶子节点数字之和2https://leetcode-cn.com/problems/sum-root-to-leaf-numbers
78. 子集2https://leetcode-cn.com/problems/subsets
剑指 Offer 03. 数组中重复的数字2https://leetcode-cn.com/problems/shu-zu-zhong-zhong-fu-de-shu-zi-lcof
93. 复原IP地址2https://leetcode-cn.com/problems/restore-ip-addresses
82. 删除排序链表中的重复元素 II2https://leetcode-cn.com/problems/remove-duplicates-from-sorted-list-ii
138. 复制带随机指针的链表2https://leetcode-cn.com/problems/copy-list-with-random-pointer
113. 路径总和 II2https://leetcode-cn.com/problems/path-sum-ii
剑指 Offer 65. 不用加减乘除做加法2https://leetcode-cn.com/problems/bu-yong-jia-jian-cheng-chu-zuo-jia-fa-lcof
459. 重复的子字符串2https://leetcode-cn.com/problems/repeated-substring-pattern
19. 删除链表的倒数第N个节点2https://leetcode-cn.com/problems/remove-nth-node-from-end-of-list
11. 盛最多水的容器2https://leetcode-cn.com/problems/container-with-most-water
26. 删除排序数组中的重复项2https://leetcode-cn.com/problems/remove-duplicates-from-sorted-array
103. 二叉树的锯齿形层次遍历2https://leetcode-cn.com/problems/binary-tree-zigzag-level-order-traversal
补充题21. 字符串相减2https://mp.weixin.qq.com/s/kCue4c0gnLSw0HosFl_t7w
907. 子数组的最小值之和2https://leetcode-cn.com/problems/sum-of-subarray-minimums
补充题22. IP地址与整数的转换2https://mp.weixin.qq.com/s/u-RahFTB3JIqND41HqtotQ
692. 前K个高频单词2https://leetcode-cn.com/problems/top-k-frequent-words
200. 岛屿数量2https://leetcode-cn.com/problems/number-of-islands
14. 最长公共前缀2https://leetcode-cn.com/problems/longest-common-prefix
118. 杨辉三角2https://leetcode-cn.com/problems/pascals-triangle
剑指 Offer 57 - II. 和为s的连续正数序列2https://leetcode-cn.com/problems/he-wei-sde-lian-xu-zheng-shu-xu-lie-lcof
剑指 Offer 40. 最小的k个数2https://leetcode-cn.com/problems/zui-xiao-de-kge-shu-lcof
378. 有序矩阵中第K小的元素2https://leetcode-cn.com/problems/kth-smallest-element-in-a-sorted-matrix
48. 旋转图像2https://leetcode-cn.com/problems/rotate-image
480. 滑动窗口中位数2https://leetcode-cn.com/problems/sliding-window-median
1095. 山脉数组中查找目标值2https://leetcode-cn.com/problems/find-in-mountain-array
405. 数字转换为十六进制数2https://leetcode-cn.com/problems/convert-a-number-to-hexadecimal
92. 反转链表 II2https://leetcode-cn.com/problems/reverse-linked-list-ii
876. 链表的中间结点2https://leetcode-cn.com/problems/middle-of-the-linked-list
剑指 Offer 24. 反转链表1https://leetcode-cn.com/problems/fan-zhuan-lian-biao-lcof
409. 最长回文串1https://leetcode-cn.com/problems/longest-palindrome
224. 基本计算器1https://leetcode-cn.com/problems/basic-calculator
94. 二叉树的中序遍历1https://leetcode-cn.com/problems/binary-tree-inorder-traversal
530. 二叉搜索树的最小绝对差1https://leetcode-cn.com/problems/minimum-absolute-difference-in-bst
315. 计算右侧小于当前元素的个数1https://leetcode-cn.com/problems/count-of-smaller-numbers-after-self
260. 只出现一次的数字 III1https://leetcode-cn.com/problems/single-number-iii
679. 24 点游戏1https://leetcode-cn.com/problems/24-game
994. 腐烂的橘子1https://leetcode-cn.com/problems/rotting-oranges
588. 设计内存文件系统1https://leetcode-cn.com/problems/design-in-memory-file-system
125. 验证回文串1https://leetcode-cn.com/problems/valid-palindrome
41. 缺失的第一个正数1https://leetcode-cn.com/problems/first-missing-positive
337. 打家劫舍 III1https://leetcode-cn.com/problems/house-robber-iii
226. 翻转二叉树1https://leetcode-cn.com/problems/invert-binary-tree
剑指 Offer 51. 数组中的逆序对1https://leetcode-cn.com/problems/shu-zu-zhong-de-ni-xu-dui-lcof
补充题17. 两个有序数组第k小的数1
217. 存在重复元素1https://leetcode-cn.com/problems/contains-duplicate
242. 有效的字母异位词1https://leetcode-cn.com/problems/valid-anagram
63. 不同路径 II1https://leetcode-cn.com/problems/unique-paths-ii
74. 搜索二维矩阵1https://leetcode-cn.com/problems/search-a-2d-matrix
701. 二叉搜索树中的插入操作1https://leetcode-cn.com/problems/insert-into-a-binary-search-tree
1047. 删除字符串中的所有相邻重复项1https://leetcode-cn.com/problems/remove-all-adjacent-duplicates-in-string
75. 颜色分类1https://leetcode-cn.com/problems/sort-colors
补充题14. 阿拉伯数字转中文数字1
134. 加油站1https://leetcode-cn.com/problems/gas-station
231. 2的幂1https://leetcode-cn.com/problems/power-of-two
451. 根据字符出现频率排序1https://leetcode-cn.com/problems/sort-characters-by-frequency
24. 两两交换链表中的节点1https://leetcode-cn.com/problems/swap-nodes-in-pairs
剑指 Offer 10- I. 斐波那契数列1https://leetcode-cn.com/problems/fei-bo-na-qi-shu-lie-lcof
7. 整数反转1https://leetcode-cn.com/problems/reverse-integer
316. 去除重复字母1https://leetcode-cn.com/problems/remove-duplicate-letters
117. 填充每个节点的下一个右侧节点指针 II1https://leetcode-cn.com/problems/populating-next-right-pointers-in-each-node-ii
61. 旋转链表1https://leetcode-cn.com/problems/rotate-list
283. 移动零1https://leetcode-cn.com/problems/move-zeroes
剑指 Offer 36. 二叉搜索树与双向链表1https://leetcode-cn.com/problems/er-cha-sou-suo-shu-yu-shuang-xiang-lian-biao-lcof
128. 最长连续序列1https://leetcode-cn.com/problems/longest-consecutive-sequence
1044. 最长重复子串1https://leetcode-cn.com/problems/longest-duplicate-substring
76. 最小覆盖子串1https://leetcode-cn.com/problems/minimum-window-substring
50. Pow(x, n)1https://leetcode-cn.com/problems/powx-n
162. 寻找峰值1https://leetcode-cn.com/problems/find-peak-element
208. 实现 Trie (前缀树)1https://leetcode-cn.com/problems/implement-trie-prefix-tree
179. 最大数1https://leetcode-cn.com/problems/largest-number
728. 自除数1https://leetcode-cn.com/problems/self-dividing-numbers
391. 完美矩形1https://leetcode-cn.com/problems/perfect-rectangle
523. 连续的子数组和1https://leetcode-cn.com/problems/continuous-subarray-sum
137. 只出现一次的数字 II1https://leetcode-cn.com/problems/single-number-ii
598. 范围求和 II1https://leetcode-cn.com/problems/range-addition-ii
258. 各位相加1https://leetcode-cn.com/problems/add-digits
443. 压缩字符串1https://leetcode-cn.com/problems/string-compression
72. 编辑距离1https://leetcode-cn.com/problems/edit-distance
292. Nim 游戏1https://leetcode-cn.com/problems/nim-game
297. 二叉树的序列化与反序列化1https://leetcode-cn.com/problems/serialize-and-deserialize-binary-tree
518. 零钱兑换 II1https://leetcode-cn.com/problems/coin-change-2
剑指 Offer 11. 旋转数组的最小数字1https://leetcode-cn.com/problems/xuan-zhuan-shu-zu-de-zui-xiao-shu-zi-lcof
剑指 Offer 32 - III. 从上到下打印二叉树 III1https://leetcode-cn.com/problems/cong-shang-dao-xia-da-yin-er-cha-shu-iii-lcof
622. 设计循环队列1https://leetcode-cn.com/problems/design-circular-queue
1299. 将每个元素替换为右侧最大元素1https://leetcode-cn.com/problems/replace-elements-with-greatest-element-on-right-side
67. 二进制求和1https://leetcode-cn.com/problems/add-binary
64. 最小路径和1https://leetcode-cn.com/problems/minimum-path-sum
剑指 Offer 52. 两个链表的第一个公共节点1https://leetcode-cn.com/problems/liang-ge-lian-biao-de-di-yi-ge-gong-gong-jie-dian-lcof
560. 和为K的子数组1https://leetcode-cn.com/problems/subarray-sum-equals-k
28. 实现 strStr()1https://leetcode-cn.com/problems/implement-strstr
84. 柱状图中最大的矩形1https://leetcode-cn.com/problems/largest-rectangle-in-histogram
295. 数据流的中位数1https://leetcode-cn.com/problems/find-median-from-data-stream
225. 用队列实现栈1https://leetcode-cn.com/problems/implement-stack-using-queues
剑指 Offer 09. 用两个栈实现队列1https://leetcode-cn.com/problems/yong-liang-ge-zhan-shi-xian-dui-lie-lcof
442. 数组中重复的数据1https://leetcode-cn.com/problems/find-all-duplicates-in-an-array
381. O(1) 时间插入、删除和获取随机元素 - 允许重复1https://leetcode-cn.com/problems/insert-delete-getrandom-o1-duplicates-allowed
695. 岛屿的最大面积1https://leetcode-cn.com/problems/max-area-of-island
111. 二叉树的最小深度1https://leetcode-cn.com/problems/minimum-depth-of-binary-tree
567. 字符串的排列1https://leetcode-cn.com/problems/permutation-in-string
107. 二叉树的层次遍历 II1https://leetcode-cn.com/problems/binary-tree-level-order-traversal-ii
1219. 黄金矿工1https://leetcode-cn.com/problems/path-with-maximum-gold
剑指 Offer 16. 数值的整数次方1https://leetcode-cn.com/problems/shu-zhi-de-zheng-shu-ci-fang-lcof