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| # LeetCode | ||
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| [简体中文](./README.md) | English | ||
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| --- | ||
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| ## Introduction | ||
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| LeetCode Solutions: A Record of My Problem Solving Journey. | ||
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| This repository will be divided into four parts for now: | ||
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| - The first part is the solutions to some classic problems on LeetCode, including the idea thinkings, key points and code implementations. | ||
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| - The second part is the summary of data structures and algorithms. | ||
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| - The third part is [Anki flashcards](https://apps.ankiweb.net) that record the LeetCode problems in a certain way so as to make it easier to remember. | ||
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| - The fourth part is future plans on content that would be introduced into the above parts. | ||
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| > Only when having mastered the basic data structures and algorithms can you solve complex problems easily. | ||
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| ## Usage Instructions | ||
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| - For the parts that were added recently, there will be a 🆕 behind. | ||
| - For the parts that were updated recently, there will be a 🖊 behind. | ||
| - Here will be the place to update Anki Flashcards in the future as well. | ||
| - Here is a mind mapping graph showing the summary of categorizations of problems that are questioned frequently in interviews. We could analyze according to the information in the graph. | ||
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| (Picture credited by [LeetCode-cn](https://www.zhihu.com/question/24964987/answer/586425979).) | ||
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| The algorithms mainly includes: | ||
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| - Basic skills: Divide-and-Conquer; Binary; Greedy | ||
| - Sorting algorithms: Quicksort; Merge Sort; Counting Sort | ||
| - Searching algorithms: Backtracking; Recursion; Depth-First-Search (DFS); Breath-First-Search (BFS); Binary Search Tree; etc. | ||
| - Graph theory: Shortest Path Problem; Minimal Spanning Tree | ||
| - Dynamic Programming: Knapsack Problem; Longest Common Subsequence (LCS) Problem | ||
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| The data structures mainly includes: | ||
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| - Array and linked list: Singly/Doubly-Linked List | ||
| - Stack and queue | ||
| - Hash table | ||
| - Heap: Min-Max Heap | ||
| - Tree and Graph: Lowest Common Ancestor (LCA); Disjoint-Set | ||
| - String: Prefix Tree (Trie); Suffix Tree | ||
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| ## Previews | ||
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| [0042.trapping-rain-water](./problems/42.trapping-rain-water.md): | ||
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| [Stack in Browser](./thinkings/basic-data-structure.md)： | ||
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| [backtrack problems](./problems/90.subsets-ii.md): | ||
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| [0198.house-robber](./problems/198.house-robber.md): | ||
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| [0454.4-sum-ii](./problems/454.4-sum-ii.md): | ||
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| ## Top Problems Progress | ||
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| - [Top 100 Linked Questions](https://leetcode.com/problemset/top-100-liked-questions/) (44 / 100) | ||
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| - [Top Interview Questions](https://leetcode.com/problemset/top-interview-questions/) (64 / 145) | ||
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| ## Portals | ||
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| ### Solutions to LeetCode Classic Problems | ||
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| > Here only lists some representative problems but not all. | ||
| #### Easy | ||
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| - [0020.Valid Parentheses](./problems/20.validParentheses.md) | ||
| - [0026.remove-duplicates-from-sorted-array](./problems/26.remove-duplicates-from-sorted-array.md) | ||
| - [0088.merge-sorted-array](./problems/88.merge-sorted-array.md) | ||
| - [0121.best-time-to-buy-and-sell-stock](./problems/121.best-time-to-buy-and-sell-stock.md) 🆕 | ||
| - [0122.best-time-to-buy-and-sell-stock-ii](./problems/122.best-time-to-buy-and-sell-stock-ii.md) 🆕 | ||
| - [0136.single-number](./problems/136.single-number.md) | ||
| - [0167.two-sum-ii-input-array-is-sorted](./problems/167.two-sum-ii-input-array-is-sorted.md) | ||
| - [0169.majority-element](./problems/169.majority-element.md) | ||
| - [0190.reverse-bits](./problems/190.reverse-bits.md) | ||
| - [0191.number-of-1-bits](./problems/191.number-of-1-bits.md) | ||
| - [0198.house-robber](./problems/198.house-robber.md) 🆕 | ||
| - [0203.remove-linked-list-elements](./problems/203.remove-linked-list-elements.md) | ||
| - [0206.reverse-linked-list](./problems/206.reverse-linked-list.md) | ||
| - [0219.contains-duplicate-ii](./problems/219.contains-duplicate-ii.md) | ||
| - [0226.invert-binary-tree](./problems/226.invert-binary-tree.md) | ||
| - [0283.move-zeroes](./problems/283.move-zeroes.md) | ||
| - [0349.intersection-of-two-arrays](./problems/349.intersection-of-two-arrays.md) | ||
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| #### Medium | ||
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| - [0002. Add Two Numbers](./problems/2.addTwoNumbers.md) | ||
| - [0003. Longest Substring Without Repeating Characters](./problems/3.longestSubstringWithoutRepeatingCharacters.md) | ||
| - [0011.container-with-most-water](./problems/11.container-with-most-water.md) | ||
| - [0015.3-sum](./problems/15.3-sum.md) 🆕 | ||
| - [0019. Remove Nth Node From End of List](./problems/19.removeNthNodeFromEndofList.md) | ||
| - [0024. Swap Nodes In Pairs](./problems/24.swapNodesInPairs.md) | ||
| - [0039.combination-sum](./problems/39.combination-sum.md) | ||
| - [0040.combination-sum-ii](./problems/40.combination-sum-ii.md) | ||
| - [0046.permutations](./problems/46.permutations.md) | ||
| - [0047.permutations-ii](./problems/47.permutations-ii.md) | ||
| - [0055.jump-game](./problems/55.jump-game.md) 🆕 | ||
| - [0062.unique-paths](./problems/62.unique-paths.md )🆕 | ||
| - [0075.sort-colors](./problems/75.sort-colors.md) | ||
| - [0078.subsets](./problems/78.subsets.md) 🆕 | ||
| - [0086.partition-list](./problems/86.partition-list.md) | ||
| - [0090.subsets-ii](./problems/90.subsets-ii.md) | ||
| - [0091.decode-ways](./problems/91.decode-ways.md) 🆕 | ||
| - [0092.reverse-linked-list-ii](./problems/92.reverse-linked-list-ii.md) | ||
| - [0094.binary-tree-inorder-traversal](./problems/94.binary-tree-inorder-traversal.md) | ||
| - [0102.binary-tree-level-order-traversal](./problems/102.binary-tree-level-order-traversal.md) | ||
| - [0103.binary-tree-zigzag-level-order-traversal](./problems/103.binary-tree-zigzag-level-order-traversal.md) | ||
| - [0139.word-break](./problems/139.word-breakmd) | ||
| - [0144.binary-tree-preorder-traversal](./problems/144.binary-tree-preorder-traversal.md) | ||
| - [0150.evaluate-reverse-polish-notation](./problems/150.evaluate-reverse-polish-notation.md) 🖊 | ||
| - [0152.maximum-product-subarray](./problems/152.maximum-product-subarray.md) 🆕 | ||
| - [0199.binary-tree-right-side-view](./problems/199.binary-tree-right-side-view.md) | ||
| - [0201.bitwise-and-of-numbers-range](./problems/201.bitwise-and-of-numbers-range.md) | ||
| - [0208.implement-trie-prefix-tree](./problems/208.implement-trie-prefix-tree.md) 🆕 | ||
| - [0209.minimum-size-subarray-sum](./problems/209.minimum-size-subarray-sum.md) 🖊 | ||
| - [0236.lowest-common-ancestor-of-a-binary-tree](./problems/236.lowest-common-ancestor-of-a-binary-tree.md)🆕 | ||
| - [0238.product-of-array-except-self](./problems/238.product-of-array-except-self.md) 🆕 | ||
| - [0240.search-a-2-d-matrix-ii](./problems/240.search-a-2-d-matrix-ii.md) | ||
| - [0279.perfect-squares](./problems/279.perfect-squares.md) | ||
| - [0309.best-time-to-buy-and-sell-stock-with-cooldown](./problems/309.best-time-to-buy-and-sell-stock-with-cooldown.md) 🆕 | ||
| - [0322.coin-change](./problems/322.coin-change.md) | ||
| - [0334.increasing-triplet-subsequence](./problems/334.increasing-triplet-subsequence.md) | ||
| - [0328.odd-even-linked-list](./problems/328.odd-even-linked-list.md) | ||
| - [0416.partition-equal-subset-sum](./problems/416.partition-equal-subset-sum.md) | ||
| - [0445.add-two-numbers-ii](./problems/445.add-two-numbers-ii.md) | ||
| - [0454.4-sum-ii](./problems/454.4-sum-ii.md) 🆕 | ||
| - [0494.target-sum](./problems/494.target-sum.md) 🆕 | ||
| - [0518.coin-change-2](./problems/518.coin-change-2.md) | ||
| - [0875.koko-eating-bananas](./problems/875.koko-eating-bananas.md) | ||
| - [0877.stone-game](./problems/877.stone-game.md) | ||
| - [0887.super-egg-drop](./problems/887.super-egg-drop.md) | ||
| - [0900.rle-iterator](./problems/900.rle-iterator.md) | ||
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| #### Hard | ||
| - [0023.merge-k-sorted-lists](./problems/23.merge-k-sorted-lists.md) | ||
| - [0042.trapping-rain-water](./problems/42.trapping-rain-water.md) | ||
| - [0128.longest-consecutive-sequence](./problems/128.longest-consecutive-sequence.md) 🆕 | ||
| - [0145.binary-tree-postorder-traversal](./problems/145.binary-tree-postorder-traversal.md) | ||
| - [0146.lru-cache](./problems/146.lru-cache.md) | ||
| - [0239.sliding-window-maximum](./problems/239.sliding-window-maximum.md) | ||
| - [0295.find-median-from-data-stream](./problems/295.find-median-from-data-stream.md) 🆕 | ||
| - [0301.remove-invalid-parentheses](./problems/301.remove-invalid-parentheses.md) | ||
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| ### Summary of Data Structures and Algorithms | ||
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| - 🖊 [Data Structure](./thinkings/basic-data-structure.md) (Drafts) | ||
| - 🖊 [Binary Tree Traversal](./thinkings/binary-tree-traversal.md) | ||
| - [Dynamic Programming](./thinkings/dynamic-programming.md) | ||
| - [Huffman Encode and Run Length Encode](./thinkings/run-length-encode-and-huffman-encode.md) | ||
| - [Bloom Filter](./thinkings/bloom-filter.md) | ||
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| ### Anki Flashcards | ||
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| Anki falshcards would be mainly two parts: the mappings from key points to problems; the mappings from problems to idea thinks, key points and code implementations. | ||
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| All flashcards are put in [anki-card](./assets/anki/leetcode.apkg). | ||
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| > Please check [here](https://apps.ankiweb.net/) for more about the usage of Anki. | ||
| Latest updated flashcards (only lists the front page): | ||
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| - What is the key point of the binary search algorithm? Related problems? | ||
| - How to simplify the operations using the features of stacks? Related problems? | ||
| - The thinkings and related problems of double-pointers problems? | ||
| - The thinkings and related problems of sliding window problems? | ||
| - The thinkings and related problems of backtracking? | ||
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| ### Future Plans | ||
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| - [0494.target-sum](./todo/494.target-sum.js) | ||
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| - [0609.find-duplicate-file-in-system](./todo/609.find-duplicate-file-in-system.js) | ||
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| - [0010.regular-expression-matching](./todo/10.regular-expression-matching.js) | ||
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| - [0309.best-time-to-buy-and-sell-stock-with-cooldown](./todo/309.best-time-to-buy-and-sell-stock-with-cooldown.js) | ||
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| - [0365.water-and-jug-problem](./todo/365.water-and-jug-problem.js) | ||
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| - [Complete Anki Flashcards](./assets/anki/) | ||
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| - [Collection of String Problem](./todo/str/) | ||
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| ## Community Chat Groups | ||
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| We're still on the early stage, so feedback from community is very welcome. For sake of reducing the costs of communication, I created some chat groups. | ||
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| ### Telegram | ||
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| [http://t.me/leetcode_intl](http://t.me/leetcode_intl) | ||
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| ### QQ (For China Region) | ||
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| ### WeChat (For China Region) | ||
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| (Add this bot and reply "leetcode" to join the group.) | ||
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| ## Contribution | ||
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| - If you have any ideas, [Issues](https://github.com/azl397985856/leetcode/issues) or chat in groups. | ||
| - If you want to commit to the repository, Pull Request is welcome. | ||
| - If you want to edit images resources in this project, [here](./assets/drawio/) lists the files that can be edited on [draw.io](https://www.draw.io/). |
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