LeetCode

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Template

• Tree
• LinkedList
• Stack
• Array

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• TwoPointer

• Bit

• Bfs

• Stack

• Enum

• Tree

• Divide&conquer

• Back

• Sort

• Search

• LinkedList

• BinarySearch

• Catalan

• StackMonotonic

• SortCounter

• Hash

• Greedy

• Dp

• Classic

• Math

• Sql

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TwoPointer

Title	cn	Difficulty	Solution	Algorithm
0003.longest-substring-without-repeating-characters	无重复字符的最长子串	Medium	Go
0019.remove-nth-node-from-end-of-list	删除链表的倒数第 N 个结点	Medium	Go
0027.remove-element	移除元素	Easy	Go
0030.substring-with-concatenation-of-all-words	串联所有单词的子串	Hard	Go
0042.trapping-rain-water	接雨水	Hard	Go
0075.sort-colors	颜色分类	Medium	Go
0076.minimum-window-substring	最小覆盖子串	Hard	Go
0080.remove-duplicates-from-sorted-array-ii	删除有序数组中的重复项 II	Medium	Go
0424.longest-repeating-character-replacement	替换后的最长重复字符	Medium	Go
0443.string-compression	压缩字符串	Medium	Go
0524.longest-word-in-dictionary-through-deleting	通过删除字母匹配到字典里最长单词	Medium	Go
0718.maximum-length-of-repeated-subarray	最长重复子数组	Medium	Go
0930.binary-subarrays-with-sum	和相同的二元子数组	Medium	Go
1099.two-sum-less-than-k	小于 K 的两数之和	Easy	Go
1790.check-if-one-string-swap-can-make-strings-equal	仅执行一次字符串交换能否使两个字符串相等	Easy	Go

Bit

Title	cn	Difficulty	Solution	Algorithm
0067.add-binary	二进制求和	Easy	Go
0136.single-number	只出现一次的数字	Easy	Go
0137.single-number-ii	只出现一次的数字 II	Medium	Go
0260.single-number-iii	只出现一次的数字 III	Medium	Go
0371.sum-of-two-integers	两整数之和	Medium	Go
0401.binary-watch	二进制手表	Easy	Go
0421.maximum-xor-of-two-numbers-in-an-array	数组中两个数的最大异或值	Medium	Go
0461.hamming-distance	汉明距离	Easy	Go
0476.number-complement	数字的补数	Easy	Go
0477.total-hamming-distance	汉明距离总和	Medium	Go
0869.reordered-power-of-2	重新排序得到 2 的幂	Medium	Go
1689.partitioning-into-minimum-number-of-deci-binary-numbers	十-二进制数的最少数目	Medium	Go
Offer 0015.er-jin-zhi-zhong-1de-ge-shu-lcof	二进制中1的个数	Medium	Go
Trans#0168.excel-sheet-column-title Excel	表列名称	Easy	Go

Bfs

Title	cn	Difficulty	Solution	Algorithm
0098.validate-binary-search-tree	验证二叉搜索树	Medium	Go
0102.binary-tree-level-order-traversal	二叉树的层序遍历	Medium	Go
0103.binary-tree-zigzag-level-order-traversal	二叉树的锯齿形层序遍历	Medium	Go
0107.binary-tree-level-order-traversal-ii	二叉树的层序遍历 II	Medium	Go
0111.minimum-depth-of-binary-tree	二叉树的最小深度	Easy	Go
0116.populating-next-right-pointers-in-each-node	填充每个节点的下一个右侧节点指针	Medium	Go
0117.populating-next-right-pointers-in-each-node-ii	填充每个节点的下一个右侧节点指针 II	Medium	Go
0199.binary-tree-right-side-view	二叉树的右视图	Medium	Go
0297.serialize-and-deserialize-binary-tree	二叉树的序列化与反序列化	Hard	Go
0428.serialize-and-deserialize-n-ary-tree	序列化和反序列化 N 叉树	Hard	Go
0429.n-ary-tree-level-order-traversal N	叉树的层序遍历	Medium	Go
0433.minimum-genetic-mutation	最小基因变化	Medium	Go
0513.find-bottom-left-tree-value	找树左下角的值	Medium	Go
0515.find-largest-value-in-each-tree-row	在每个树行中找最大值	Medium	Go
0559.maximum-depth-of-n-ary-tree N	叉树的最大深度	Easy	Go
0623.add-one-row-to-tree	在二叉树中增加一行	Medium	Go
0637.average-of-levels-in-binary-tree	二叉树的层平均值	Easy	Go
1161.maximum-level-sum-of-a-binary-tree	最大层内元素和	Medium	Go
1306.jump-game-iii	跳跃游戏 III	Medium	Go

Stack

Title	cn	Difficulty	Solution	Algorithm
0020.valid-parentheses	有效(){}[]括号	Easy	Go
0032.longest-valid-parentheses	最长有效()括号	Hard	Go
0071.simplify-path	简化路径	Medium	Go
0084.largest-rectangle-in-histogram	统计矩形	Hard	Go
0085.maximal-rectangle	最大矩形	Hard	Go
0094.binary-tree-inorder-traversal	二叉树的中序遍历	Easy	Go
0103.binary-tree-zigzag-level-order-traversal	二叉树的锯齿形层序遍历	Medium	Go
0144.binary-tree-preorder-traversal	二叉树的前序遍历	Easy	Go
0145.binary-tree-postorder-traversal	二叉树的后序遍历	Easy	Go
0150.evaluate-reverse-polish-notation	逆波兰表达式求值	Medium	Go
0155.min-stack	最小栈	Easy	Go
0224.basic-calculator	加减小括号	Hard	Go
0225.implement-stack-using-queues	用队列实现栈	Easy	Go
0227.basic-calculator-ii	加减乘除	Medium	Go
0232.implement-queue-using-stacks	用栈实现队列	Easy	Go
0255.verify-preorder-sequence-in-binary-search-tree	验证前序遍历序列二叉搜索树	Medium	Go
0272.closest-binary-search-tree-value-ii	最接近的二叉搜索树值 II	Hard	Go
0316.remove-duplicate-letters	去除重复字母	Medium	Go
0331.verify-preorder-serialization-of-a-binary-tree	验证二叉树的前序序列化	Medium	Go
0341.flatten-nested-list-iterator	扁平化嵌套列表迭代器	Medium	Go
0385.mini-parser	迷你语法分析器	Medium	Go
0394.decode-string	字符串解码	Medium	Go
0402.remove-k-digits	移掉K位数字后最小	Medium	Go
0430.flatten-a-multilevel-doubly-linked-list	扁平化多级双向链表	Medium	Go
0439.ternary-expression-parser	三元表达式解析器	Medium	Go
0445.add-two-numbers-ii	两数相加	Medium	Go
0456.132-pattern 132	模式	Medium	Go
0496.next-greater-element-i	下一个更大元素 I	Easy	Go
0503.next-greater-element-ii	下一个更大的值	Medium	Go
0591.tag-validator	标签验证器	Hard	Go
0636.exclusive-time-of-functions	函数的独占时间	Medium	Go
0678.valid-parenthesis-string	有效的括号字符串	Medium	Go
0726.number-of-atoms	原子的数量	Hard	Go
0735.asteroid-collision	星球碰撞	Medium	Go
0739.daily-temperatures	能观测到更高温度的天数	Medium	Go
0772.basic-calculator-iii	加减乘除小括号	Hard	Go
0844.backspace-string-compare	比较含退格的字符串	Easy	Go
0856.score-of-parentheses	括号的分数	Medium	Go
0880.decoded-string-at-index	索引处的解码字符串	Medium	Go
0895.maximum-frequency-stack	最大频率栈	Hard	Go
0901.online-stock-span	股票价格跨度	Medium	Go
0921.minimum-add-to-make-parentheses-valid	使括号有效的最少添加	Medium	Go
0946.validate-stack-sequences	验证栈序列	Medium	Go
1003.check-if-word-is-valid-after-substitutions	检查替换后的词是否有效	Medium	Go
1019.next-greater-node-in-linked-list	下一个更大的值	Medium	Go
1081.smallest-subsequence-of-distinct-characters	去除重复字母	Medium	Go
1190.reverse-substrings-between-each-pair-of-parentheses	反转每对括号间的子串	Medium	Go
1221.split-a-string-in-balanced-strings	分割平衡字符串	Easy	Go
1544.make-the-string-great	整理字符串	Easy	Go
1598.crawler-log-folder	文件夹操作日志搜集器	Easy	Go

Enum

Title	cn	Difficulty	Solution	Algorithm
0002.add-two-numbers	两数相加	Medium	Go
0006.zigzag-conversion Z	字形变换	Medium	Go
0014.longest-common-prefix	最长公共前缀	Easy	Go
0036.valid-sudoku	有效的数独	Medium	Go
0038.count-and-say	外观数列	Medium	Go
0058.length-of-last-word	最后一个单词的长度	Easy	Go
0121.best-time-to-buy-and-sell-stock	买卖股票的最佳时机	Easy	Go
0122.best-time-to-buy-and-sell-stock-ii	买卖股票的最佳时机 II	Medium	Go
0125.valid-palindrome	验证回文串	Easy	Go
0171.excel-sheet-column-number Excel	表列序号	Easy	Go
0423.reconstruct-original-digits-from-english	从英文中重建数字	Medium	Go
1213.intersection-of-three-sorted-arrays	三个有序数组的交集	Easy	Go
1295.find-numbers-with-even-number-of-digits	统计位数为偶数的数字	Easy	Go
1389.create-target-array-in-the-given-order	按既定顺序创建目标数组	Easy	Go
1503.last-moment-before-all-ants-fall-out-of-a-plank	所有蚂蚁掉下来前的最后一刻	Medium	Go
1646.get-maximum-in-generated-array	获取生成数组中的最大值	Easy	Go
1672.richest-customer-wealth	最富有客户的资产总量	Easy	Go
2042.check-if-numbers-are-ascending-in-a-sentence	检查句子中的数字是否递增	Easy	Go
5875.final-value-of-variable-after-performing-operations 执行操作后的变量值		Hard	Go
			Go

Tree

Title	cn	Difficulty	Solution	Algorithm
0022.generate-parentheses	有效的 括号组合	Medium	Go
0094.binary-tree-inorder-traversal		Easy	Go
			Go
			Go
			Go
0095.unique-binary-search-trees-ii		Medium	Go
0096.unique-binary-search-trees		Medium	Go
			Go
0098.validate-binary-search-tree		Medium	Go
			Go
			Go
			Go
0099.recover-binary-search-tree		Medium	Go
			Go
			Go
0100.same-tree		Easy	Go
0101.symmetric-tree		Easy	Go
0102.binary-tree-level-order-traversal	二叉树的层序遍历	Medium	Go
0103.binary-tree-zigzag-level-order-traversal	二叉树的锯齿形层序遍历	Medium	Go
0104.maximum-depth-of-binary-tree		Easy	Go
0105.construct-binary-tree-from-preorder-and-inorder-traversal		Medium	Go
0106.construct-binary-tree-from-inorder-and-postorder-traversal		Medium	Go
0107.binary-tree-level-order-traversal-ii		Medium	Go
0108.convert-sorted-array-to-binary-search-tree		Easy	Go
0109.convert-sorted-list-to-binary-search-tree		Medium	Go
			Go
			Go
0110.balanced-binary-tree		Easy	Go
			Go
0111.minimum-depth-of-binary-tree		Easy	Go
0112.path-sum		Easy	Go
0113.path-sum-ii		Medium	Go
0114.flatten-binary-tree-to-linked-list		Medium	Go
0116.populating-next-right-pointers-in-each-node		Medium	Go
0124.binary-tree-maximum-path-sum		Hard	Go
0129.sum-root-to-leaf-numbers		Medium	Go
0144.binary-tree-preorder-traversal		Easy	Go
			Go
			Go
			Go
0145.binary-tree-postorder-traversal		Easy	Go
0156.binary-tree-upside-down		Medium	Go
0173.binary-search-tree-iterator		Medium	Go
0199.binary-tree-right-side-view		Medium	Go
0222.count-complete-tree-nodes		Medium	Go
			Go
0226.invert-binary-tree		Easy	Go
0230.kth-smallest-element-in-a-bst		Medium	Go
0235.lowest-common-ancestor-of-a-binary-search-tree		Easy	Go
0236.lowest-common-ancestor-of-a-binary-tree		Medium	Go
0250.count-univalue-subtrees		Medium	Go
0255.verify-preorder-sequence-in-binary-search-tree		Medium	Go
0257.binary-tree-paths		Easy	Go
0270.closest-binary-search-tree-value		Easy	Go
0272.closest-binary-search-tree-value-ii		Hard	Go
0285.inorder-successor-in-bst		Medium	Go
0297.serialize-and-deserialize-binary-tree		Hard	Go
			Go
0298.binary-tree-longest-consecutive-sequence		Medium	Go
0314.binary-tree-vertical-order-traversal	二叉树的垂直遍历	Medium	Go
0366.find-leaves-of-binary-tree		Medium	Go
0404.sum-of-left-leaves		Easy	Go
0426.convert-binary-search-tree-to-sorted-doubly-linked-list		Medium	Go
0428.serialize-and-deserialize-n-ary-tree		Hard	Go
0437.path-sum-iii		Medium	Go
			Go
0449.serialize-and-deserialize-bst		Medium	Go
0450.delete-node-in-a-bst		Medium	Go
0501.find-mode-in-binary-search-tree		Easy	Go
0508.most-frequent-subtree-sum		Medium	Go
0510.inorder-successor-in-bst-ii		Medium	Go
0530.minimum-absolute-difference-in-bst		Easy	Go
0538.convert-bst-to-greater-tree		Medium	Go
0543.diameter-of-binary-tree		Easy	Go
0559.maximum-depth-of-n-ary-tree		Easy	Go
0563.binary-tree-tilt		Easy	Go
0572.subtree-of-another-tree		Easy	Go
0589.n-ary-tree-preorder-traversal		Easy	Go
			Go
0590.n-ary-tree-postorder-traversal		Easy	Go
			Go
0606.construct-string-from-binary-tree		Easy	Go
0617.merge-two-binary-trees		Easy	Go
0653.two-sum-iv-input-is-a-bst		Easy	Go
0654.maximum-binary-tree		Medium	Go
0669.trim-a-binary-search-tree		Medium	Go
0671.second-minimum-node-in-a-binary-tree		Easy	Go
0687.longest-univalue-path		Medium	Go
0700.search-in-a-binary-search-tree		Easy	Go
0701.insert-into-a-binary-search-tree		Medium	Go
0783.minimum-distance-between-bst-nodes		Easy	Go
0814.binary-tree-pruning		Medium	Go
0865.smallest-subtree-with-all-the-deepest-nodes		Medium	Go
0872.leaf-similar-trees		Easy	Go
0889.construct-binary-tree-from-preorder-and-postorder-traversal		Medium	Go
0897.increasing-order-search-tree		Easy	Go
0938.range-sum-of-bst		Easy	Go
0951.flip-equivalent-binary-trees		Medium	Go
0965.univalued-binary-tree		Easy	Go
0979.distribute-coins-in-binary-tree		Medium	Go
1008.construct-binary-search-tree-from-preorder-traversal		Medium	Go
1022.sum-of-root-to-leaf-binary-numbers		Easy	Go
1026.maximum-difference-between-node-and-ancestor		Medium	Go
1038.binary-search-tree-to-greater-sum-tree		Medium	Go
1104.path-in-zigzag-labelled-binary-tree		Medium	Go
1123.lowest-common-ancestor-of-deepest-leaves		Medium	Go
1161.maximum-level-sum-of-a-binary-tree		Medium	Go
1302.deepest-leaves-sum		Medium	Go
1315.sum-of-nodes-with-even-valued-grandparent		Medium	Go
1325.delete-leaves-with-a-given-value		Medium	Go
1448.count-good-nodes-in-binary-tree		Medium	Go
1484.clone-binary-tree-with-random-pointer		Medium	Go
1490.clone-n-ary-tree		Medium	Go
1560.most-visited-sector-in-a-circular-track		Easy	Go
1600.throne-inheritance	皇位继承顺序	Medium	Go
1602.find-nearest-right-node-in-binary-tree		Medium	Go
1669.merge-in-between-linked-lists		Medium	Go
1740.find-distance-in-a-binary-tree		Medium	Go

Divide&conquer

Title	cn	Difficulty	Solution	Algorithm
0014.longest-common-prefix	最长公共前缀	Easy	Go

Back

Title	cn	Difficulty	Solution	Algorithm
0037.sudoku-solver	解数独	Hard	Go
0051.n-queens N	皇后	Hard	Go
0052.n-queens-ii N	皇后 II	Hard	Go
Offer.0038.zi-fu-chuan-de-pai-lie-lcof	字符串的排列	Medium	Go

Sort

Title	cn	Difficulty	Solution	Algorithm
0179.largest-number	最大数	Medium	Go
	面试题 17.14. 最小K个数	Medium	Go

Search

Title	cn	Difficulty	Solution	Algorithm
0011.container-with-most-water	盛最多水的容器	Medium	Go
0026.remove-duplicates-from-sorted-array	删除有序数组中的重复项	Easy	Go
1838.frequency-of-the-most-frequent-element	最高频元素的频数	Medium	Go
1894.find-the-student-that-will-replace-the-chalk	找到需要补充粉笔的学生编号	Medium	Go
Offer 53 - I.	在排序数组中查找数字 I	Easy	Go

LinkedList

Title	cn	Difficulty	Solution	Algorithm
0457.circular-array-loop	环形数组是否存在循环	Medium	Go	Array
0021.merge-two-sorted-lists	合并两个有序链表	Easy	Go	Merge
0023.merge-k-sorted-lists	合并K个有序链表	Hard	Go	Merge
0355.design-twitter	设计推特	Medium	Go	Merge
0024.swap-nodes-in-pairs	两两交换节点	Medium	Go	Swap
0025.reverse-nodes-in-k-group K	个一组翻转链表	Hard	Go
0061.rotate-list	拼接链表	Medium	Go
0082.remove-duplicates-from-sorted-list-ii	删除重复全部元素	Medium	Go
0083.remove-duplicates-from-sorted-list	删除重复多余元素	Easy	Go
0086.partition-list	小于X的靠左	Medium	Go
0092.reverse-linked-list-ii	反转链表	Medium	Go
0109.convert-sorted-list-to-binary-search-tree	有序链表转二叉搜索树	Medium	Go
			Go
			Go
0138.copy-list-with-random-pointer	深拷贝随机指针链表	Medium	Go
0141.linked-list-cycle	是否有环	Easy	Go
0142.linked-list-cycle-ii	环的起点	Medium	Go
0143.reorder-list	重排链表	Medium	Go
0147.insertion-sort-list	插入排序	Medium	Go
0160.intersection-of-two-linked-lists	相交起始点	Easy	Go
0203.remove-linked-list-elements	删除链表元素	Easy	Go
0206.reverse-linked-list	反转链表	Easy	Go
0234.palindrome-linked-list	回文链表	Easy	Go
0237.delete-node-in-a-linked-list	删除节点	Easy	Go
0328.odd-even-linked-list	奇偶链表	Medium	Go
0369.plus-one-linked-list	加一	Medium	Go
0379.design-phone-directory		Medium	Go
0430.flatten-a-multilevel-doubly-linked-list	扁平化多级双向链表	Medium	Go
0445.add-two-numbers-ii	两数相加	Medium	Go
0707.design-linked-list	设计链表	Medium	Go
0708.insert-into-a-sorted-circular-linked-list	循环有序列表的插入	Medium	Go
0725.split-linked-list-in-parts	分割链表	Medium	Go
0817.linked-list-components	链表组件	Medium	Go
0876.middle-of-the-linked-list	中间节点	Easy	Go
1019.next-greater-node-in-linked-list	下一个更大的值	Medium	Go
1171.remove-zero-sum-consecutive-nodes-from-linked-list	从链表中删去总和值为零的连续节点	Medium	Go
1290.convert-binary-number-in-a-linked-list-to-integer	二进制链表的值	Easy	Go
1367.linked-list-in-binary-tree	二叉树的链表	Medium	Go
1474.delete-n-nodes-after-m-nodes-of-a-linked-list	删除m节点后移动n节点	Easy	Go
1634.add-two-polynomials-represented-as-linked-lists	多项式合并	Medium	Go
			Go
1669.merge-in-between-linked-lists	删除区间后合并	Medium	Go
1670.design-front-middle-back-queue	队列	Medium	Go
1721.swapping-nodes-in-a-linked-list	交换镜像节点	Medium	Go
	剑指 Offer 22. 链表中倒数第k个节点	Medium	Go
	剑指 Offer II 023. 两个链表的第一个重合节点	Hard	Go

BinarySearch

Title	cn	Difficulty	Solution	Algorithm
0004.median-of-two-sorted-arrays	寻找两个正序数组的中位数	Hard	Go
0014.longest-common-prefix	最长公共前缀	Easy	Go
0033.search-in-rotated-sorted-array	搜索旋转排序数组	Medium	Go
0034.find-first-and-last-position-of-element-in-sorted-array	在排序数组中查找元素的第一个和最后一个位置	Medium	Go
0035.search-insert-position	搜索插入位置	Easy	Go
0069.sqrtx x	的平方根	Easy	Go
0081.search-in-rotated-sorted-array-ii	搜索旋转排序数组 II	Medium	Go
0153.find-minimum-in-rotated-sorted-array	寻找旋转排序数组中的最小值	Medium	Go
0154.find-minimum-in-rotated-sorted-array-ii	寻找旋转排序数组中的最小值 II	Hard	Go
0162.find-peak-element	寻找峰值	Medium	Go
0167.two-sum-ii-input-array-is-sorted	两数之和 II - 输入有序数组	Easy	Go
0278.first-bad-version	第一个错误版本	Easy	Go
0367.valid-perfect-square	有效的完全平方数	Easy	Go
0374.guess-number-higher-or-lower	猜数字大小	Easy	Go
0441.arranging-coins	排列硬币	Easy	Go
0701.insert-into-a-binary-search-tree	二叉搜索树中的插入操作	Medium	Go
0744.find-smallest-letter-greater-than-target	寻找比目标字母大的最小字母	Easy	Go
0852.peak-index-in-a-mountain-array	山脉数组的峰顶索引	Easy	Go
1064.fixed-point	不动点	Easy	Go
1150.check-if-a-number-is-majority-element-in-a-sorted-array	检查一个数是否在数组中占绝大多数	Easy	Go
1385.find-the-distance-value-between-two-arrays	两个数组间的距离值	Easy	Go
1539.kth-missing-positive-number	第 k 个缺失的正整数	Easy	Go
1608.special-array-with-x-elements-greater-than-or-equal-x	特殊数组的特征值	Easy	Go
LCP 18.	早餐组合	Medium	Go
	剑指 Offer 11. 旋转数组的最小数字	Medium	Go
	剑指 Offer 53 - II. 0～n-1中缺失的数字	Easy	Go
	面试题 08.03. 魔术索引	Medium	Go
	面试题 10.05. 稀疏数组搜索	Hard	Go

Catalan

Title	cn	Difficulty	Solution	Algorithm
0022.generate-parentheses		Medium	Go

StackMonotonic

Title	cn	Difficulty	Solution	Algorithm
0042.trapping-rain-water	接雨水	Hard	Go

SortCounter

Title	cn	Difficulty	Solution	Algorithm

Hash

Title	cn	Difficulty	Solution	Algorithm
Cnt Diff Xor	✅ 0389.find-the-difference 找不同	Easy	Go
Cnt Heap	❌ 1086.high-five 前五科的均分	Easy	Go
Cnt	✅ 0359.logger-rate-limiter 限流器	Easy	Go
Cnt	✅ 0604.design-compressed-string-iterator 迭代压缩字符串	Easy	Go
Cnt	✅ 0888.fair-candy-swap 糖果棒交换后数量相等	Easy	Go
Cnt	✅ 1941.check-if-all-characters-have-equal-number-of-occurrences 检查是否所有字符出现次数相同	Easy	Go
Cnt	✅ LCS 02. 完成一半题目最少的题型	Medium	Go
Diff	✅ 0299.bulls-and-cows 公牛奶牛	Medium	Go
Diff	✅ 0349.intersection-of-two-arrays 两个数组的交集	Easy	Go
Diff	✅ 0350.intersection-of-two-arrays-ii 两个数组的交集 II	Easy	Go
Diff	✅ 0771.jewels-and-stones 找J在S中的数量	Easy	Go
Diff	✅ 0819.most-common-word 最常见的单词	Easy	Go
Diff	✅ 1002.find-common-characters 查找公共字符	Easy	Go
Distance	✅ 1165.single-row-keyboard 机械手最少移动次数	Easy	Go
Divide	✅ 1119.remove-vowels-from-a-string 删去字符串中的元音	Easy	Go
Divide	✅ 1763.longest-nice-substring 大小写都出现的最长子串	Easy	Go
Filter	✅ 0217.contains-duplicate 出现重复	Easy	Go
Filter	✅ 0884.uncommon-words-from-two-sentences 两句话中的不常见单词	Easy	Go
Filter	✅ 1133.largest-unique-number 最大唯一数	Easy	Go
Filter	✅ 1394.find-lucky-integer-in-an-array 找出数组中的幸运数	Easy	Go
Filter	✅ 1748.sum-of-unique-elements 唯一元素的和	Easy	Go
Filter	✅ 1935.maximum-number-of-words-you-can-type 可以输入的最大单词数	Easy	Go
Group GCD	✅ 0914.x-of-a-kind-in-a-deck-of-cards 卡牌分组	Easy	Go
Group	✅ 0288.unique-word-abbreviation 单词是唯一缩写	Medium	Go
Group	✅ 0348.design-tic-tac-toe 设计井字棋	Medium	Go
Group	✅ 0500.keyboard-row 只返回键盘同一行的字母	Easy	Go
Group	✅ 0811.subdomain-visit-count 子域名访问次数	Medium	Go
Group	✅ 0929.unique-email-addresses 不同的邮件地址数	Easy	Go
Group	✅ 1128.number-of-equivalent-domino-pairs 等价多米诺骨牌对的数量	Easy	Go
Group	✅ 1275.find-winner-on-a-tic-tac-toe-game 找出井字棋的获胜者	Easy	Go
Group	✅ 1399.count-largest-group 统计最大组的数目	Easy	Go
Group	✅ 1512.number-of-good-pairs 好数对的数目 i < j && a[i] == a[j]	Easy	Go
Group	✅ 1742.maximum-number-of-balls-in-a-box 盒子中小球的最大数量	Easy	Go
Group	✅ 1805.number-of-different-integers-in-a-string 字符串中不同整数的数目	Easy	Go
Group	✅ 2006.count-number-of-pairs-with-absolute-difference-k 差的绝对值为 K 的数对数目	Easy	Go
Group	✅ 2032.two-out-of-three 至少在两个数组中出现的值	Easy	Go
Link 0356.line-reflection	直线镜像	Medium	Go
Link Trie	✅ 0720.longest-word-in-dictionary 词典中连续递接 的最长单词	Easy	Go
Link	✅ 0205.isomorphic-strings 同构字符串	Easy	Go
Link	✅ 0290.word-pattern 单词规律	Easy	Go
Link	✅ 0734.sentence-similarity 句子相似性	Easy	Go
Link	✅ 0760.find-anagram-mappings 找A在B的位置	Easy	Go
Link	✅ 0953.verifying-an-alien-dictionary 验证外星语词典	Easy	Go
Link	✅ 1122.relative-sort-array 数组的相对排序	Easy	Go
Link	✅ 1331.rank-transform-of-an-array 数组序号转换	Easy	Go
Link	✅ 1346.check-if-n-and-its-double-exist 检查整数及其两倍数是否存在	Easy	Go
Link	✅ 1370.increasing-decreasing-string 上升下降字符串	Easy	Go
Link	❌ 0244.shortest-word-distance-ii 最短单词距离 II	Medium	Go
Link	❌ 0599.minimum-index-sum-of-two-lists 相同值的最小索引总和	Easy	Go
Link	❌ 1640.check-array-formation-through-concatenation 能否连接形成数组	Easy	Go
Link	❌ 2007.find-original-array-from-doubled-array 从双倍数组中还原原数组	Medium	Go
Link	❌ 2013.detect-squares 检测正方形	Medium	Go
Moore	投票 ✅ 0169.majority-element 众数	Easy	Go
Moore	投票 ❌ 0229.majority-element-ii 求众数 II	Medium	Go
Permutation	✅ 0128.longest-consecutive-sequence 最长递增 🤚 偏移	Medium	Go
Permutation	✅ 0242.valid-anagram 有效的字母异位词 🤚	Easy	Go
Permutation	✅ 0266.palindrome-permutation 有效回文	Easy	Go
Permutation	✅ 0383.ransom-note 全排列 == 子排列	Easy	Go
Permutation	✅ 0409.longest-palindrome 最长回文串	Easy	Go
Permutation	✅ 0575.distribute-candies 分糖果 🤚 最多类型	Easy	Go
Permutation	✅ 0594.longest-harmonious-subsequence 最长相差 1 子排列 🤚 偏移	Easy	Go
Permutation	✅ 0748.shortest-completing-word 最短补全词	Easy	Go
Permutation	✅ 0859.buddy-strings 交换一次后字符串相等	Easy	Go
Permutation	✅ 1160.find-words-that-can-be-formed-by-characters 拼写单词	Easy	Go
Permutation	✅ 1189.maximum-number-of-balloons “气球” 的最大数量	Easy	Go
Permutation	✅ 1426.counting-elements 存在 (值+1 的后置元素) 的元素个数 🤚 偏移	Easy	Go
Permutation	✅ 1460.make-two-arrays-equal-by-reversing-sub-arrays 通过翻转子数组使两个数组相等	Easy	Go
Pre	✅ 0930.binary-subarrays-with-sum 和相同的二元子数组	Medium	Go
Pre	❌ 1711.count-good-meals 大餐计数	Medium	Go
Queue	✅ 0362.design-hit-counter 敲击计数器	Medium	Go
Scope	✅ 0041.first-missing-positive 缺失的首个正数 🤚 剔除 标记 筛选	Hard	Go
Score	✅ 0442.find-all-duplicates-in-an-array 等值数组中 重复的数 🤚 偏移 标记	Medium	Go
Score	✅ 0448.find-all-numbers-disappeared-in-an-array 等值数组中 消失的数 🤚 偏移 标记 筛选	Easy	Go
Score	✅ 1636.sort-array-by-increasing-frequency 按照频率将数组升序排序 🤚 权重	Easy	Go
Score	✅ 1796.second-largest-digit-in-a-string 字符串中第二大的数字	Easy	Go
Score	❌ 0387.first-unique-character-in-a-string 字符串中的第一个唯一字符 🤚 标记索引 剔除	Easy	Go
Vector	✅ 0049.group-anagrams 字母异位词分组	Medium	Go
Vector	✅ 0249.group-shifted-strings 移位字符串分组	Medium	Go
Vector	✅ 0438.find-all-anagrams-in-a-string 找到字符串中所有字母异位词	Medium	Go
Window Divide	❌ 0395.longest-substring-with-at-least-k-repeating-characters 至少包含 K 个重复字符的最长子串	Medium	Go
Window	✅ 0003.longest-substring-without-repeating-characters 无重复的最长子串	Medium	Go
Window	✅ 0159.longest-substring-with-at-most-two-distinct-characters 至多包含两个不同字符的最长子串	Medium	Go
Window	✅ 0219.contains-duplicate-ii 两个重复元素距离小于等于K	Easy	Go
Window	✅ 0246.strobogrammatic-number 中心对称数	Easy	Go
Window	✅ 0697.degree-of-an-array 度相同的最短连续子数组	Easy	Go
Window	✅ 0961.n-repeated-element-in-size-2n-array 2N 中重复 N 次的元素	Easy	Go
Window	✅ 1624.largest-substring-between-two-equal-characters 两个相同字符之间的最长子字符串	Easy	Go
Window	❌ 0325.maximum-size-subarray-sum-equals-k 和等于 k 的最长子数组长度	Medium	Go
Window	❌ 0340.longest-substring-with-at-most-k-distinct-characters 至多包含 K 个不同字符的最长子串	Medium	Go

Greedy

Title	cn	Difficulty	Solution	Algorithm
0045.jump-game-ii	跳跃游戏 II	Medium	Go
0055.jump-game	跳跃游戏	Medium	Go
0134.gas-station	加油站	Medium	Go
0135.candy	分发糖果	Hard	Go
0678.valid-parenthesis-string	有效的括号字符串	Medium	Go

Dp

Title	cn	Difficulty	Solution	Algorithm
0005.longest-palindromic-substring	最长回文	Medium	Go
0010.regular-expression-matching .*	正则匹配	Hard	Go
0032.longest-valid-parentheses	最长有效括号	Hard	Go
0042.trapping-rain-water	接雨水	Hard	Go
0044.wildcard-matching *	？通配符	Hard	Go
0053.maximum-subarray	最大子序和	Easy	Go
0062.unique-paths	不同路径	Medium	Go
0063.unique-paths-ii	不同路径 II	Medium	Go
0064.minimum-path-sum	最小路径和	Medium	Go
0070.climbing-stairs	爬楼梯	Easy	Go
0072.edit-distance	编辑距离	Hard	Go
0087.scramble-string	扰乱字符串	Hard	Go
0091.decode-ways	解码方法	Medium	Go
0097.interleaving-string	交错字符串	Medium	Go
0115.distinct-subsequences	不同的子序列	Hard	Go
0118.pascals-triangle	杨辉三角	Easy	Go
0119.pascals-triangle-ii	杨辉三角 II	Easy	Go
0120.triangle	三角形最小路径	Medium	Go
0121.best-time-to-buy-and-sell-stock	买卖股票的最佳时机	Easy	Go
0123.best-time-to-buy-and-sell-stock-iii	买卖股票的最佳时机 III	Hard	Go
0139.word-break	单词拆分	Medium	Go
0279.perfect-squares	完全平方数	Medium	Go
0303.range-sum-query-immutable	区域和检索 - 数组不可变	Easy	Go
0322.coin-change	零钱兑换	Medium	Go
0474.ones-and-zeroes	一和零	Medium	Go
0509.fibonacci-number	斐波那契数	Easy	Go
0518.coin-change-2	零钱兑换 II	Medium	Go
0523.continuous-subarray-sum	连续子数组和 K的倍数	Medium	Go
0525.contiguous-array	连续数组	Medium	Go
0650.2-keys-keyboard	只有两个键的键盘	Medium	Go
0877.stone-game	石头游戏	Medium	Go
1480.running-sum-of-1d-array	数组前缀和	Easy	Go
1744.can-you-eat-your-favorite-candy-on-your-favorite-day	你能在你最喜欢的那天吃到你最喜欢的糖果吗？	Medium	Go
1769.minimum-number-of-operations-to-move-all-balls-to-each-box	移动所有球到每个盒子所需的最小操作数	Medium	Go
5876.sum-of-beauty-in-the-array 数组美丽值求和		Hard	Go
			Go

Classic

Title	cn	Difficulty	Solution	Algorithm
0005.longest-palindromic-substring	最长回文子串 (manacher)	Medium	Go
0028.implement-strstr	实现 strStr() (kmp)	Easy	Go

Math

Title	cn	Difficulty	Solution	Algorithm
0007.reverse-integer		Easy	Go
0008.string-to-integer-atoi		Medium	Go
0009.palindrome-number		Easy	Go
0012.integer-to-roman		Medium	Go
0013.roman-to-integer		Easy	Go
0029.divide-two-integers		Medium	Go
0031.next-permutation		Medium	Go
0043.multiply-strings	字符串相乘	Medium	Go
0066.plus-one	加一	Easy	Go
0165.compare-version-numbers	比较版本号	Medium	Go
0166.fraction-to-recurring-decimal	分数到小数	Medium	Go
0191.number-of-1-bits		Easy	Go
0263.ugly-number	丑数	Easy	Go
0268.missing-number	丢失的数字	Easy	Go
0292.nim-game		Easy	Go
0319.bulb-switcher		Medium	Go
0415.add-strings	字符串相加	Easy	Go
0453.minimum-moves-to-equal-array-elements	最小操作次数使数组元素相等	Easy	Go
0470.implement-rand10-using-rand7	用 Rand7() 实现 Rand10()	Medium	Go
0478.generate-random-point-in-a-circle	在圆内随机生成点	Medium	Go
0492.construct-the-rectangle	构造矩形	Easy	Go
0877.stone-game	石头游戏	Medium	Go
1025.divisor-game	除数博弈	Easy	Go
1266.minimum-time-visiting-all-points		Easy	Go
1281.subtract-the-product-and-sum-of-digits-of-an-integer		Easy	Go
1313.decompress-run-length-encoded-list		Easy	Go
1403.minimum-subsequence-in-non-increasing-order		Easy	Go
1791.find-center-of-star-graph		Easy	Go
Cnt # LCP 11.	期望个数统计	Medium	Go

Sql

Title	cn	Difficulty	Solution	Algorithm
0175.combine-two-tables	给所有人加上地址	Easy	Go
0176.second-highest-salary	找第二名 Null 也返回	Medium	Go
0177.nth-highest-salary	找第N名 Null 也返回	Medium	Go
0178.rank-scores	稠密排行	Medium	Go
0180.consecutive-numbers	连续出现3次的数字	Medium	Go
0181.employees-earning-more-than-their-managers	超过经理收入的员工	Easy	Go
0182.duplicate-emails	找重复邮箱	Easy	Go
0183.customers-who-never-order	从不订购的客户	Easy	Go
0184.department-highest-salary	部门最高工资的员工	Medium	Go
0185.department-top-three-salaries	部门工资前三高的员工	Hard	Go
0196.delete-duplicate-emails	删除重复邮箱	Easy	Go
0197.rising-temperature	温度相比昨天是上升的	Easy	Go
0262.trips-and-users	非禁止用户取消率	Hard	Go
0511.game-play-analysis-i	首次登陆的时间	Easy	Go
0512.game-play-analysis-ii	首次登陆的设备名称	Easy	Go
0534.game-play-analysis-iii	每人每天累积多少时长	Medium	Go
0550.game-play-analysis-iv	首日后隔天登录玩家的比率	Medium	Go
0569.median-employee-salary	每个公司薪酬中位数	Hard	Go
0570.managers-with-at-least-5-direct-reports	至少5名下属的经理	Medium	Go
0571.find-median-given-frequency-of-numbers	频率数字的中位数	Hard	Go
0574.winning-candidate	当选者	Medium	Go
0577.employee-bonus	员工奖金	Easy	Go
0578.get-highest-answer-rate-question	回答率最高的问题	Medium	Go
0579.find-cumulative-salary-of-an-employee	员工累积薪水	Hard	Go
0580.count-student-number-in-departments	各专业学生人数	Medium	Go
0584.find-customer-referee	用户的推荐人	Easy	Go
0585.investments-in-2016 2016	年的投资	Medium	Go
0586.customer-placing-the-largest-number-of-orders	订单最多的客户	Easy	Go
0595.big-countries	大的国家	Easy	Go
0596.classes-more-than-5-students	超过5名学生的课	Easy	Go
0597.friend-requests-i-overall-acceptance-rate	好友申请总体通过率	Easy	Go
0601.human-traffic-of-stadium	人流量	Hard	Go
0602.friend-requests-ii-who-has-the-most-friends	谁有最多的好友	Medium	Go
0603.consecutive-available-seats	连续空余座位	Easy	Go
0607.sales-person	销售员	Easy	Go
0608.tree-node	树节点	Medium	Go
0610.triangle-judgement	判断三角形	Easy	Go
0612.shortest-distance-in-a-plane	平面上的最近距离	Medium	Go
0613.shortest-distance-in-a-line	直线上的最近距离	Easy	Go
0614.second-degree-follower	二级关注者	Medium	Go
0615.average-salary-departments-vs-company	平均工资：部门与公司比较	Hard	Go
0618.students-report-by-geography	学生地理信息报告	Hard	Go
0619.biggest-single-number	最出现一次的最大数字	Easy	Go
0620.not-boring-movies	有趣的电影	Easy	Go
0626.exchange-seats	换座位	Medium	Go
0627.swap-salary	变更性别	Easy	Go
1045.customers-who-bought-all-products	买下所有产品的客户	Medium	Go
1050.actors-and-directors-who-cooperated-at-least-three-times	合作至少三次的演员和导员	Easy	Go
1068.product-sales-analysis-i	产品的年份和价格	Easy	Go
1069.product-sales-analysis-ii	产品的销售总额	Easy	Go
1070.product-sales-analysis-iii	第一年的价格	Medium	Go
1075.project-employees-i	项目的平均年限	Easy	Go
1076.project-employees-ii	员工最多的项目 销售额最高的销售者	Easy	Go
1077.project-employees-iii	项目经济最丰富的员工	Medium	Go
1082.sales-analysis-i	销售额最高的销售者	Easy	Go
1083.sales-analysis-ii	买 S8 却没有 iPhone 的买家	Easy	Go
1084.sales-analysis-iii	只在春季销售的产品	Easy	Go
1097.game-play-analysis-v	第二天留存率	Hard	Go
1098.unpopular-books	过去一年少于十本的书	Medium	Go
1107.new-users-daily-count	每日新用户	Medium	Go
1112.highest-grade-for-each-student	最高分数的学科	Medium	Go
1113.reported-posts	不同的报告记录	Easy	Go
1126.active-businesses	活跃的业务	Medium	Go
1127.user-purchase-platform	统计单端或双端人数	Hard	Go
1132.reported-posts-ii	垃圾清除率	Medium	Go
1141.user-activity-for-the-past-30-days-i	近30天活跃数	Easy	Go
1142.user-activity-for-the-past-30-days-ii	平均会话次数	Easy	Go
1148.article-views-i	浏览过自己文章的作者	Easy	Go
1149.article-views-ii	一天浏览过两篇文章的人	Medium	Go
1158.market-analysis-i	统计2019年订单总数	Medium	Go
1159.market-analysis-ii	售出第二件不是喜欢的商品	Hard	Go
1164.product-price-at-a-given-date	变更后的价格	Medium	Go
1173.immediate-food-delivery-i	当天配送率	Easy	Go
1174.immediate-food-delivery-ii	首日即时配送订单	Medium	Go
1179.reformat-department-table	格式化工资	Easy	Go
1193.monthly-transactions-i	统计	Medium	Go
1194.tournament-winners	每组的优胜者	Hard	Go
1204.last-person-to-fit-in-the-elevator	最后进入电梯	Medium	Go
1205.monthly-transactions-ii	交易统计	Medium	Go
1211.queries-quality-and-percentage		Easy	Go
1212.team-scores-in-football-tournament	计算得分	Medium	Go
1225.report-contiguous-dates	统计连续	Hard	Go
1241.number-of-comments-per-post	查询评论数	Easy	Go
1251.average-selling-price		Easy	Go
1264.page-recommendations	推荐朋友喜欢的页面	Medium	Go
1270.all-people-report-to-the-given-manager	递归查询	Medium	Go
1280.students-and-examinations	学生各科测试次数	Easy	Go
1285.find-the-start-and-end-number-of-continuous-ranges	区间次数	Medium	Go
1294.weather-type-in-each-country 11	月份的天气	Easy	Go
1303.find-the-team-size	团队人数	Easy	Go
1308.running-total-for-different-genders	男女的累积分数	Medium	Go
1321.restaurant-growth	最近七天平均值	Medium	Go
1322.ads-performance	广告效果统计	Easy	Go
1327.list-the-products-ordered-in-a-period	指定日期总数	Easy	Go
1336.number-of-transactions-per-visit	每次访问的交易次数	Hard	Go
1341.movie-rating	评论数和评分数统计	Medium	Go
1350.students-with-invalid-departments	不存在院校的学生	Easy	Go
1355.activity-participants	去除第一和倒数第一	Medium	Go
1364.number-of-trusted-contacts-of-a-customer	互为好友的顾客	Medium	Go
1369.get-the-second-most-recent-activity	倒数第二次活动	Hard	Go
1378.replace-employee-id-with-the-unique-identifier	使用uuid替换id	Easy	Go
1384.total-sales-amount-by-year	年度统计	Hard	Go
1393.capital-gainloss	资本损益	Medium	Go
1398.customers-who-bought-products-a-and-b-but-not-c	买AB不买C	Medium	Go
1407.top-travellers	旅行距离排名	Easy	Go
1412.find-the-quiet-students-in-all-exams	成绩中游学生	Hard	Go
1418.display-table-of-food-orders-in-a-restaurant	点菜展示表	Medium	Go
1421.npv-queries	连表	Easy	Go
1435.create-a-session-bar-chart	分段汇总	Easy	Go
1440.evaluate-boolean-expression	连表比较	Medium	Go
1445.apples-oranges	销量差	Medium	Go
1454.active-users	连续7天在线的用户	Medium	Go
1459.rectangles-area	组合成矩形	Medium	Go
1468.calculate-salaries	扣税	Medium	Go
1479.sales-by-day-of-the-week	每周销量统计	Hard	Go
1485.group-sold-products-by-the-date group	聚合	Easy	Go
1495.friendly-movies-streamed-last-month	儿童适宜的电影	Easy	Go
1501.countries-you-can-safely-invest-in	通话时长高于平均	Medium	Go
1511.customer-order-frequency	六七月消费大于等于100	Easy	Go
1517.find-users-with-valid-e-mails	邮箱正则	Easy	Go
1527.patients-with-a-condition	患病患者	Easy	Go
1532.the-most-recent-three-orders	最近三笔订单	Medium	Go
1543.fix-product-name-format	格式化	Easy	Go
1549.the-most-recent-orders-for-each-product	产品最新订单	Medium	Go
1555.bank-account-summary	是否透支	Medium	Go
1565.unique-orders-and-customers-per-month	月订单数和顾客数	Easy	Go
1571.warehouse-manager	计算立方	Easy	Go
1581.customer-who-visited-but-did-not-make-any-transactions	进店未交易	Easy	Go
1587.bank-account-summary-ii	余大于10000的用户	Easy	Go
1596.the-most-frequently-ordered-products-for-each-customer	经常订购的商品	Medium	Go
1607.sellers-with-no-sales	没有卖出产品的销售	Easy	Go
1613.find-the-missing-ids	缺失的id	Medium	Go
1623.all-valid-triplets-that-can-represent-a-country	三个学校组合不同的代表队	Easy	Go
1633.percentage-of-users-attended-a-contest	注册率	Easy	Go
1635.hopper-company-queries-i	活跃数与行程数	Hard	Go
1645.hopper-company-queries-ii	工作率	Hard	Go
1651.hopper-company-queries-iii	平均距离和平均时间	Hard	Go
1661.average-time-of-process-per-machine	平均运行时间	Easy	Go
1667.fix-names-in-a-table	修复名字	Easy	Go
1677.products-worth-over-invoices	统计	Easy	Go
1683.invalid-tweets	无效推文	Easy	Go
1693.daily-leads-and-partners	统计	Easy	Go
1699.number-of-calls-between-two-persons	通话次数	Medium	Go
1709.biggest-window-between-visits	日期缺失	Medium	Go
1715.count-apples-and-oranges	统计	Medium	Go
1729.find-followers-count	关注数	Easy	Go
1731.the-number-of-employees-which-report-to-each-employee	每位经理有多少下属	Easy	Go
1741.find-total-time-spent-by-each-employee	员工花费时间	Easy	Go
1747.leetflex-banned-accounts	应被禁止的账户	Medium	Go
1757.recyclable-and-low-fat-products	可回收且低脂的产品	Easy	Go
1767.find-the-subtasks-that-did-not-execute	找到未执行的子任务	Hard	Go
1777.products-price-for-each-store	每家商店价格	Easy	Go
1783.grand-slam-titles	大满贯数	Medium	Go
1789.primary-department-for-each-employee	员工的主要部门	Easy	Go
1795.rearrange-products-table	商品价格合并	Easy	Go
1809.ad-free-sessions	没有展示广告的会话	Easy	Go
1811.find-interview-candidates	统计	Medium	Go
1821.find-customers-with-positive-revenue-this-year	正收入	Easy	Go
1831.maximum-transaction-each-day	每天最大交易	Medium	Go