Leetcode Patterns 🚀

Master Leetcode with Categorized Problem-Solving Strategies

📌 Overview

This repository is a structured collection of Leetcode problems, categorized by commonly tested patterns in coding interviews. The goal is to identify patterns in problem-solving, making it easier to approach similar problems during real interviews.

🔍 Why This Repository?

• 📌 Pattern-Based Learning - Focus on fundamental patterns rather than individual problems.
• 🏆 Efficient Practice - Learn how to recognize similar problems quickly.
• ⚡ Optimized Solutions - Solutions are written in Python and optimized for time & space complexity.
• 🏗️ Well-Structured - Problems are grouped into key patterns used in FAANG and top-tier company interviews.

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📂 Repository Structure

Each pattern has its own directory with a set of solved problems and explanations:

Leetcode-Patterns/
│── Arrays/
│   ├── Two_Pointer.py
│   ├── Sliding_Window.py
│── LinkedList/
│   ├── Reverse_LinkedList.py
│── Trees/
│   ├── Binary_Tree_Traversal.py
│── Graphs/
│   ├── BFS.py
│   ├── DFS.py
│── Dynamic_Programming/
│   ├── Fibonacci.py
│   ├── Longest_Common_Subsequence.py
│── Backtracking/
│   ├── Permutations.py
│── README.md

Each file includes:

• 📝 Problem Statement
• ✅ Optimized Solution
• 📊 Time & Space Complexity Analysis
• 💡 Edge Cases Considered

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📜 Leetcode Patterns Covered

1️⃣ Arrays & Strings

• Two Pointers (e.g., Sorted Array Sum)
• Sliding Window (e.g., Longest Substring Without Repeating Characters)
• Prefix Sum
• Kadane’s Algorithm (e.g., Maximum Subarray Sum)
• Binary Search

2️⃣ Linked List

• Reversing a Linked List
• Fast & Slow Pointer
• Cycle Detection
• Merge Two Sorted Lists

3️⃣ Trees & Graphs

• Binary Tree Traversal (DFS, BFS)
• Graph Traversal (DFS, BFS)
• Topological Sorting
• Dijkstra’s Algorithm
• Minimum Spanning Tree

4️⃣ Dynamic Programming

• Fibonacci Sequence
• Knapsack Problem
• Longest Common Subsequence
• Subset Sum
• Coin Change

5️⃣ Recursion & Backtracking

• Permutations & Combinations
• N-Queens
• Word Search
• Subsets

6️⃣ Stacks & Queues

• Monotonic Stack
• Next Greater Element
• Valid Parentheses
• LRU Cache

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🛠️ Installation & Usage

🔹 Clone the Repository

git clone https://github.com/Mohit-Jawale/Leetcode-Patterns.git
cd Leetcode-Patterns

🔹 Run a Python Script

python Arrays/Two_Pointer.py

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🎯 Contribution Guidelines

Contributions are welcome! 🚀 If you'd like to contribute:

1. Fork the repository.
2. Create a new branch:

   git checkout -b feature/new-pattern

3. Add your changes and commit:

   git commit -m "Added a new problem solution for XYZ pattern"

4. Push to your branch:

   git push origin feature/new-pattern

5. Submit a Pull Request (PR) for review.

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📬 Contact

📧 Email: jawalemohit18@gmail.com
📌 LinkedIn: Mohit Jawale

⭐ If you find this repository useful, don’t forget to give it a star! ⭐

Happy Coding! 🚀🔥