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This repository contains LeetCode resources which are useful during interview preparation.

Fundamental Concepts

• Linked List
• Queues
• Stacks
• Hash Tables
• Heaps
• Recursion
• Trees
• Tries
• Binary Search
• Dynamic Programming
• Graph Theory
• DFS Traversal
• BFS Traversal
• Dijkstra Algorithm

Patterns

• 14 Coding Interview Patterns
• Sliding Window patterns
• Two Pointers Patterns
• Substring Problem Patterns
• Dynamic Programming Patterns
• Binary Search Patterns
• Backtracking Patterns
• Tree Patterns
  • Tree Iterative Traversal
  • Tree Question Pattern
• Heap Patterns
• Graph Patterns
• Monotonic Stack Patterns
• Bit Manipulation Patterns
• String Question Patterns
• DFS + BFS Patterns (1)
• DFS + BFS Patterns (2)
• Stock Series Patterns

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

• Blind 75
• Leetcode Top 100 Liked
• Leetcode Top Interview 150
• Leetcode 75

Books

• Data Structures And Algorithms Made Easy
• Cracking the Coding Interview

Courses

• Coursera - Algorithms, Part I
• Coursera - Algorithms, Part 2

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

Stacks

Queues

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

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!