Best Leetcode Resources

This repository contains free LeetCode resources for interview prep.

Fundamental Concepts

• Hash Tables
• Linked List
• Recursion
• Sorting
• Binary Search
• Stacks
• Queues
• Trees
• Tries
• Backtracking
• Heaps
• Breadth First Search
• Depth First Search
• Graph Theory
• Dynaymic Programming
• Big O Cheat Sheet

Leetcode Spaced-Repetition Template

Patterns

• 14 Coding Interview Patterns
• Sliding Window
• Two Pointers
• Merge Intervals
• Cyclic Sort
• Monotonic Stack
• Two Heaps
• Subsets
• Modified Binary Search
• Top K Elements
• K-way merge
• DFS Pattern
• BFS Pattern
• Topological Sort

Famous Problem Sets

• Blind 75
• Neetcode 150
• Sean Prashad's Leetcode Patterns
• Leetcode Top Interview Questions

Books

• Elements of Programming Interviews
• Competitive Programmer's Handbook
• Cracking the Coding Interview

Courses

• Grokking the Coding Interview
• Data Structures with a Google SWE
• Meta Coding Interview Prep Course

Mock Interviewing

• Pramp
• Interviewing.io
• Meetapro

Resume Template

Must-do Problems

Graphs

• Redundant Connection
• Course Schedule
• Course Schedule II
• Number of connected components in an undirected graph
• Shortest Path to Get All Keys
• Pacific Atlantic Waterflow
• Word Ladder
• Number of Islands
• Clone Graph
• Alien Dictionary

Binary Trees

• Construct binary tree from preorder and inorder traversal
• Diameter of Binary Tree
• Invert Binary Tree
• Count good nodes in Binary Tree
• Serialize and Deserialize Binary Tree
• Kth smallest element in BST
• Lowest Common Ancestor of a BST
• Path Sum
• Path Sum II
• Merge two Binary Trees
• Word Search
• Word Search II
• Maximum Width of Binary Tree

Your open-source contributions are appreciated!