Awesome LeetCode resources to learn Data Structures and Algorithms and prepare for Coding Interviews.
This repository contains awesome LeetCode resources to learn Data Structures and Algorithms (DSA) and prepare for Coding interviews.
💡 Tips
📌 Fundamental Concepts
- Algorithmic Complexity
- Big-O Cheat Sheet
- Bit Manipulation Techniques
- Sorting Algorithms
- Linked List
- Queues
- Stacks
- Hash Tables
- Heaps
- Recursion
- Backtracking
- Trees
- Tries
- Binary Search
- Greedy Algorithm
- Dynamic Programming
- Graph Theory
- Important Graph Algorithms
- DFS Traversal
- BFS Traversal
- Union-Find
- Dijkstra Algorithm
- Minimum Spanning Tree
🚀 Patterns
- 15 Leetcode Patterns
- 20 DP Patterns
- Prefix Sum Pattern
- Top ‘K’ Elements Pattern
- Fast and Slow Pointers Pattern
- Two Pointers Pattern
- Linked List In-place Reversal Pattern
- Sliding Window Pattern
- Monotonic Stack Pattern
- Overlapping Intervals Pattern
- Backtracking Pattern
- Modified Binary Search Pattern
- Tree Patterns
- Graph Patterns
- DFS + BFS Patterns (1)
- DFS + BFS Patterns (2)
📝 Must-Read Leetcode Articles
- Sliding Window Template
- Two Pointers Patterns
- Collections of Important String Questions
- Substring Problem Template
- Binary Search Template
- A General Approach to Backtracking Questions
- Monotonic Stack Template
- Heap Patterns
- Bit Manipulation Patterns
- Dynamic Programming Patterns
- Stock Series Patterns
📺 YouTube Playlist
- Abdul Bari’s Algorithms Playlist
- William Fiset’s Data Structure Playlist
- William Fiset’s Graphs Playlist
- Tushar Roy’s Dynamic Programming Playlist
📇 Courses
📚 Books
🔎 Visualization
📎 LeetCode Extensions
- LeetCode Timer: Easily time your leetcode practise sessions with automatic time setting based on difficulty.
- LeetCode Video Solutions: Watch free LeetCode video ▶ solutions on the problem page itself.
- LeetCode Format: Adds Format code button on leetcode to format the code using Prettier code formatter.
- LeetHub v2: Automatically integrate your Leetcode & GeeksforGeeks submissions to GitHub.
- LeetCode VS Code Extension: Solve LeetCode problems in VS Code.
✅ Curated Problems
💻 Must-Do Problems (Topic Wise)
Linked List
- Reverse Linked List
- Linked List Cycle
- Merge Two Sorted Lists
- Intersection of Two Linked Lists
- Remove Nth Node From End of List
- Add Two Numbers
- Copy List with Random Pointer
- Flatten a Multilevel Doubly Linked List
- Rotate List
- Sort List
- Remove Duplicates from Sorted List II
- LRU Cache
- Design Browser History
- Merge k Sorted Lists
- Reverse Nodes in k-Group
Binary Trees
- Invert Binary Tree
- Convert Sorted Array to Binary Search Tree
- Count Complete Tree Nodes
- All Possible Full Binary Trees
- Delete Leaves With a Given Value
- Binary Search Tree Iterator
- Longest Univalue Path
- Delete Nodes And Return Forest
- Validate Binary Search Tree
- Construct Binary Tree from Inorder and Postorder Traversal
- All Nodes Distance K in Binary Tree
- Maximum Difference Between Node and Ancestor
- Find Duplicate Subtrees
- Flatten Binary Tree to Linked List
- House Robber III
- Step-By-Step Directions From a Binary Tree Node to Another
- Delete Node in a BST
- Populating Next Right Pointers in Each Node II
- Trim a Binary Search Tree
- Distribute Coins in Binary Tree
- Binary Search Tree to Greater Sum Tree
- Serialize and Deserialize Binary Tree
- Binary Tree Cameras
- Binary Tree Maximum Path Sum
- Maximum Sum BST in Binary Tree
Backtracking
- Permutations
- Subsets
- Generate Parentheses
- Combination Sum
- Palindrome Partitioning
- Letter Combinations of a Phone Number
- Unique Binary Search Trees II
- Partition to K Equal Sum Subsets
- N-Queens II
- Sudoku Solver
Tries
- Implement Trie (Prefix Tree)
- Longest Common Prefix
- Search Suggestions System
- Longest Word in Dictionary
- Top K Frequent Words
- Design Add and Search Words Data Structure
- Implement Magic Dictionary
- Replace Words
- Word Search II
- Stream of Characters
Your contributions are most welcome!