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https://github.com/ashishps1/awesome-leetcode-resources

This repository contains LeetCode articles which are very useful during the interview preparation.
https://github.com/ashishps1/awesome-leetcode-resources

List: awesome-leetcode-resources

algorithms coding data-structures leetcode leetcode-patterns

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This repository contains LeetCode articles which are very useful during the interview preparation.

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This repository contains awesome LeetCode resources to learn Data Structures and Algorithms (DSA) and prepare for Coding interviews.



## 💡 Tips

- [How to Start LeetCode](https://www.youtube.com/watch?v=Nx4bvwU0DqE)

- [How I Mastered DSA](https://blog.algomaster.io/p/how-i-mastered-data-structures-and-algorithms)



## 📌 Fundamental Concepts

- [Algorithmic Complexity](https://blog.algomaster.io/p/57bd4963-462f-4294-a972-4012691fc729)

- [Big-O Cheat Sheet](https://www.bigocheatsheet.com/)

- [Bit Manipulation Techniques](https://blog.algomaster.io/p/c650df76-f978-46ee-a572-eb13c354905d)

- [Sorting Algorithms](https://medium.com/jl-codes/understanding-sorting-algorithms-af6222995c8)

- [Linked List](https://leetcode.com/discuss/study-guide/1800120/become-master-in-linked-list)

  - [Dummy Node Technique](https://blog.algomaster.io/p/5d7a1368-7a0c-461a-93a9-732333ceb2a8)

- [Queues](https://medium.com/basecs/to-queue-or-not-to-queue-2653bcde5b04)

- [Stacks](https://medium.com/basecs/stacks-and-overflows-dbcf7854dc67)

- [Hash Tables](https://medium.com/basecs/taking-hash-tables-off-the-shelf-139cbf4752f0)

- [Heaps](https://medium.com/basecs/learning-to-love-heaps-cef2b273a238)

- [Recursion](https://leetcode.com/discuss/study-guide/1733447/become-master-in-recursion)

- [Backtracking](https://medium.com/algorithms-and-leetcode/backtracking-e001561b9f28)

- [Trees](https://leetcode.com/discuss/study-guide/1820334/Become-Master-in-Tree)

- [Tries](https://medium.com/basecs/trying-to-understand-tries-3ec6bede0014)

- [Binary Search](https://leetcode.com/discuss/study-guide/786126/Python-Powerful-Ultimate-Binary-Search-Template.-Solved-many-problems)

- [Greedy Algorithm](https://www.freecodecamp.org/news/greedy-algorithms/)

- [Dynamic Programming](https://medium.com/basecs/less-repetition-more-dynamic-programming-43d29830a630)

- [Graph Theory](https://medium.com/basecs/a-gentle-introduction-to-graph-theory-77969829ead8)

- [DFS Traversal](https://medium.com/basecs/deep-dive-through-a-graph-dfs-traversal-8177df5d0f13)

- [BFS Traversal](https://medium.com/basecs/going-broad-in-a-graph-bfs-traversal-959bd1a09255)

- [Union-Find](https://leetcode.com/discuss/general-discussion/1072418/Disjoint-Set-Union-(DSU)Union-Find-A-Complete-Guide)

- [Dijkstra Algorithm](https://leetcode.com/discuss/study-guide/1059477/A-guide-to-Dijkstra's-Algorithm)

- [Minimum Spanning Tree](https://www.hackerearth.com/practice/algorithms/graphs/minimum-spanning-tree/tutorial/)



## 🚀 Patterns

- [15 Leetcode Patterns](https://blog.algomaster.io/p/15-leetcode-patterns)

- [20 DP Patterns](https://blog.algomaster.io/p/20-patterns-to-master-dynamic-programming)

- [Prefix Sum Pattern](https://blog.algomaster.io/p/f96dd3de-c89c-428e-a88d-b1f751a42a57)

- [Two Pointers Pattern](https://blog.algomaster.io/p/69025a2e-b0d5-4705-8507-bba16c2691f1)

- [Fast and Slow Pointers Pattern](https://blog.algomaster.io/p/7dcce8e9-beee-4fef-8874-7aae025031b1)

- [Sliding Window Pattern](https://blog.algomaster.io/p/f4412a17-7a3a-4d0b-8e39-9ea8f429bf7c)

- [Top 'K' Elements Pattern](https://blog.algomaster.io/p/322aac40-c4d0-4e54-980d-b22d9eeebca6)

- [Monotonic Stack Pattern](https://blog.algomaster.io/p/5dabff21-11f4-470d-8e38-76ff07c63fdf)

- [Overlapping Intervals Pattern](https://blog.algomaster.io/p/812e72f7-eced-4256-a4c1-00606ae50679)

- [Backtracking Pattern](https://blog.algomaster.io/p/81d42ca2-600c-4252-aa33-a56462090048)

- [Modified Binary Search Pattern](https://blog.algomaster.io/p/d0d81b04-4c2a-4b45-a101-5137c3146686)

- [Tree Patterns](https://leetcode.com/discuss/study-guide/937307/Iterative-or-Recursive-or-DFS-and-BFS-Tree-Traversal-or-In-Pre-Post-and-LevelOrder-or-Views)

  - [Tree Iterative Traversal](https://medium.com/leetcode-patterns/leetcode-pattern-0-iterative-traversals-on-trees-d373568eb0ec)

  - [Tree Question Pattern](https://leetcode.com/discuss/study-guide/2879240/TREE-QUESTION-PATTERN-2023-oror-TREE-STUDY-GUIDE) 

- [Graph Patterns](https://leetcode.com/discuss/study-guide/655708/Graph-For-Beginners-Problems-or-Pattern-or-Sample-Solutions)

- [DFS + BFS Patterns (1)](https://medium.com/leetcode-patterns/leetcode-pattern-1-bfs-dfs-25-of-the-problems-part-1-519450a84353)

- [DFS + BFS Patterns (2)](https://medium.com/leetcode-patterns/leetcode-pattern-2-dfs-bfs-25-of-the-problems-part-2-a5b269597f52)



## 📝 Must-Read Leetcode Articles

- [Sliding Window Template](https://leetcode.com/problems/frequency-of-the-most-frequent-element/solutions/1175088/C++-Maximum-Sliding-Window-Cheatsheet-Template/)

- [Two Pointers Patterns](https://leetcode.com/discuss/study-guide/1688903/Solved-all-two-pointers-problems-in-100-days)

- [Collections of Important String Questions](https://leetcode.com/discuss/study-guide/2001789/Collections-of-Important-String-questions-Pattern)

- [Substring Problem Template](https://leetcode.com/problems/minimum-window-substring/solutions/26808/Here-is-a-10-line-template-that-can-solve-most-'substring'-problems/)

- [Binary Search Template](https://leetcode.com/discuss/study-guide/786126/Python-Powerful-Ultimate-Binary-Search-Template.-Solved-many-problems)

- [A General Approach to Backtracking Questions](https://leetcode.com/problems/permutations/solutions/18239/A-general-approach-to-backtracking-questions-in-Java-(Subsets-Permutations-Combination-Sum-Palindrome-Partioning)/)

- [Monotonic Stack Template](https://leetcode.com/discuss/study-guide/2347639/A-comprehensive-guide-and-template-for-monotonic-stack-based-problems)

- [Heap Patterns](https://leetcode.com/discuss/general-discussion/1127238/master-heap-by-solving-23-questions-in-4-patterns-category)

- [Bit Manipulation Patterns](https://leetcode.com/discuss/study-guide/4282051/all-types-of-patterns-for-bits-manipulations-and-how-to-use-it)

- [Dynamic Programming Patterns](https://leetcode.com/discuss/study-guide/458695/Dynamic-Programming-Patterns)

- [Stock Series Patterns](https://leetcode.com/problems/best-time-to-buy-and-sell-stock-with-transaction-fee/solutions/108870/most-consistent-ways-of-dealing-with-the-series-of-stock-problems/)



## 📺 YouTube Playlist

- [Abdul Bari's Algorithms Playlist](https://www.youtube.com/playlist?list=PLDN4rrl48XKpZkf03iYFl-O29szjTrs_O)

- [William Fiset's Data Structure Playlist](https://www.youtube.com/playlist?list=PLDV1Zeh2NRsB6SWUrDFW2RmDotAfPbeHu)

- [William Fiset's Graphs Playlist](https://www.youtube.com/playlist?list=PLDV1Zeh2NRsDGO4--qE8yH72HFL1Km93P)

- [Tushar Roy's Dynamic Programming Playlist](https://www.youtube.com/playlist?list=PLrmLmBdmIlpsHaNTPP_jHHDx_os9ItYXr)



## 📇 Courses

- [Coursera - Algorithms, Part I](https://www.coursera.org/learn/algorithms-part1)

- [Coursera - Algorithms, Part 2](https://www.coursera.org/learn/algorithms-part2)

- [Grokking the Coding Interview: Patterns for Coding Questions](https://www.designgurus.io/course/grokking-the-coding-interview/?aff=mopp8k)



## 📚 Books

- [Data Structures And Algorithms Made Easy](https://www.amazon.com/Data-Structures-Algorithms-Made-Easy-ebook/dp/B0CBW278NC/)

- [Cracking the Coding Interview](https://www.amazon.com/Cracking-Coding-Interview-Programming-Questions/dp/0984782850/)



## 🔎 Visualization

- [VisuAlgo](https://visualgo.net/en)

- [Algo-lens: Visualize leetcode problems](https://github.com/jaroslaw-weber/algo-lens)



## 📎 LeetCode Extensions

- [LeetCode Timer](https://chromewebstore.google.com/detail/leetcode-timer/gfkgelnlcnomnahkfmhemgpahgmibofd): Easily time your leetcode practise sessions with automatic time setting based on difficulty.

- [LeetCode Video Solutions](https://chromewebstore.google.com/detail/leetcode-video-solutions/ilnmgkahgjdpkoliooildngldmilhelm): Watch free LeetCode video ▶ solutions on the problem page itself.

- [LeetCode Format](https://chromewebstore.google.com/detail/leetcode-format/imogghebhifnnlgogigikjecilkicfpp): Adds Format code button on leetcode to format the code using Prettier code formatter.

- [LeetHub v2](https://chromewebstore.google.com/detail/leethub-v2/mhanfgfagplhgemhjfeolkkdidbakocm?hl=en): Automatically integrate your Leetcode & GeeksforGeeks submissions to GitHub.

- [LeetCode VS Code Extension](https://marketplace.visualstudio.com/items?itemName=LeetCode.vscode-leetcode): Solve LeetCode problems in VS Code.



## ✅ Curated Problems

- [Blind 75](https://leetcode.com/discuss/general-discussion/460599/blind-75-leetcode-questions)

- [Leetcode Top 100 Liked](https://leetcode.com/studyplan/top-100-liked/)

- [Leetcode Top Interview 150](https://leetcode.com/studyplan/top-interview-150/)



## 💻 Must-Do Problems (Topic Wise)

### Linked List

- [Reverse Linked List](https://leetcode.com/problems/reverse-linked-list/description/)

- [Linked List Cycle](https://leetcode.com/problems/linked-list-cycle/description/)

- [Merge Two Sorted Lists](https://leetcode.com/problems/merge-two-sorted-lists/description/)

- [Intersection of Two Linked Lists](https://leetcode.com/problems/intersection-of-two-linked-lists/description/)

- [Remove Nth Node From End of List](https://leetcode.com/problems/remove-nth-node-from-end-of-list/description/)

- [Add Two Numbers](https://leetcode.com/problems/add-two-numbers/description/)

- [Copy List with Random Pointer](https://leetcode.com/problems/copy-list-with-random-pointer/description/)

- [Flatten a Multilevel Doubly Linked List](https://leetcode.com/problems/flatten-a-multilevel-doubly-linked-list)

- [Rotate List](https://leetcode.com/problems/rotate-list/description/)

- [Sort List](https://leetcode.com/problems/sort-list/description/)

- [Remove Duplicates from Sorted List II](https://leetcode.com/problems/remove-duplicates-from-sorted-list-ii/description/)

- [LRU Cache](https://leetcode.com/problems/lru-cache/description/)

- [Design Browser History](https://leetcode.com/problems/design-browser-history/description/)

- [Merge k Sorted Lists](https://leetcode.com/problems/merge-k-sorted-lists/description/)

- [Reverse Nodes in k-Group](https://leetcode.com/problems/reverse-nodes-in-k-group/description/)

### Binary Trees

  - [Invert Binary Tree](https://leetcode.com/problems/invert-binary-tree/description/)

  - [Convert Sorted Array to Binary Search Tree](https://leetcode.com/problems/convert-sorted-array-to-binary-search-tree/description/)

  - [Count Complete Tree Nodes](https://leetcode.com/problems/count-complete-tree-nodes/description/)

  - [All Possible Full Binary Trees](https://leetcode.com/problems/all-possible-full-binary-trees/description/)

  - [Delete Leaves With a Given Value](https://leetcode.com/problems/delete-leaves-with-a-given-value/description/)

  - [Binary Search Tree Iterator](https://leetcode.com/problems/binary-search-tree-iterator/description/)

  - [Longest Univalue Path](https://leetcode.com/problems/longest-univalue-path/description/)

  - [Delete Nodes And Return Forest](https://leetcode.com/problems/delete-nodes-and-return-forest/description/)

  - [Validate Binary Search Tree](https://leetcode.com/problems/validate-binary-search-tree/description/)

  - [Construct Binary Tree from Inorder and Postorder Traversal](https://leetcode.com/problems/construct-binary-tree-from-inorder-and-postorder-traversal/description/)

  - [All Nodes Distance K in Binary Tree](https://leetcode.com/problems/all-nodes-distance-k-in-binary-tree/description/)

  - [Maximum Difference Between Node and Ancestor](https://leetcode.com/problems/maximum-difference-between-node-and-ancestor/description/)

  - [Find Duplicate Subtrees](https://leetcode.com/problems/find-duplicate-subtrees/description/)

  - [Flatten Binary Tree to Linked List](https://leetcode.com/problems/flatten-binary-tree-to-linked-list/description/)

  - [House Robber III](https://leetcode.com/problems/house-robber-iii/description/)

  - [Step-By-Step Directions From a Binary Tree Node to Another](https://leetcode.com/problems/step-by-step-directions-from-a-binary-tree-node-to-another/description/)

  - [Delete Node in a BST](https://leetcode.com/problems/delete-node-in-a-bst/description/)

  - [Populating Next Right Pointers in Each Node II](https://leetcode.com/problems/populating-next-right-pointers-in-each-node-ii/description/)

  - [Trim a Binary Search Tree](https://leetcode.com/problems/trim-a-binary-search-tree/description/)

  - [Distribute Coins in Binary Tree](https://leetcode.com/problems/distribute-coins-in-binary-tree/description/)

  - [Binary Search Tree to Greater Sum Tree](https://leetcode.com/problems/binary-search-tree-to-greater-sum-tree/description/)

  - [Serialize and Deserialize Binary Tree](https://leetcode.com/problems/serialize-and-deserialize-binary-tree/description/)

  - [Binary Tree Cameras](https://leetcode.com/problems/binary-tree-cameras/description/)

  - [Binary Tree Maximum Path Sum](https://leetcode.com/problems/binary-tree-maximum-path-sum/description/)

  - [Maximum Sum BST in Binary Tree](https://leetcode.com/problems/maximum-sum-bst-in-binary-tree/description/)

### Backtracking

- [Permutations](https://leetcode.com/problems/permutations/description/)

- [Subsets](https://leetcode.com/problems/subsets/description/)

- [Generate Parentheses](https://leetcode.com/problems/generate-parentheses/description/)

- [Combination Sum](https://leetcode.com/problems/combination-sum/description/)

- [Palindrome Partitioning](https://leetcode.com/problems/palindrome-partitioning/description/)

- [Letter Combinations of a Phone Number](https://leetcode.com/problems/letter-combinations-of-a-phone-number/description/)

- [Unique Binary Search Trees II](https://leetcode.com/problems/unique-binary-search-trees-ii/description/)

- [Partition to K Equal Sum Subsets](https://leetcode.com/problems/partition-to-k-equal-sum-subsets/description/)

- [N-Queens II](https://leetcode.com/problems/n-queens-ii/description/)

- [Sudoku Solver](https://leetcode.com/problems/sudoku-solver/description/)

### Tries

  - [Implement Trie (Prefix Tree)](https://leetcode.com/problems/implement-trie-prefix-tree/description/)

  - [Longest Common Prefix](https://leetcode.com/problems/longest-common-prefix/description/)

  - [Search Suggestions System](https://leetcode.com/problems/search-suggestions-system/description/)

  - [Longest Word in Dictionary](https://leetcode.com/problems/longest-word-in-dictionary/description/)

  - [Top K Frequent Words](https://leetcode.com/problems/top-k-frequent-words/description/)

  - [Design Add and Search Words Data Structure](https://leetcode.com/problems/design-add-and-search-words-data-structure/description/)

  - [Implement Magic Dictionary](https://leetcode.com/problems/implement-magic-dictionary/description/)

  - [Replace Words](https://leetcode.com/problems/replace-words/description/)

  - [Word Search II](https://leetcode.com/problems/word-search-ii/description/)

  - [Stream of Characters](https://leetcode.com/problems/stream-of-characters/description/)



Your contributions are most welcome!