LeetCode Solutions 📊

Welcome to my LeetCode solutions repository! This is a comprehensive collection showcasing problem-solving journey across various topics and difficulty levels. This repository is open for Hacktoberfest 2025 contributions! 🎉

---

🌟 Repository Highlights

• Diverse Topics:
  Solutions covering various areas:

  • 🥇 Arrays
  • 🧩 Strings
  • 🌳 Trees
  • 🌐 Graphs
  • ⚙️ Dynamic Programming
  • 🧮 Mathematics
  • 🛠️ Bit Manipulation

• Difficulty Levels:
  Problems categorized into:

  • 🟢 Easy
  • 🟡 Medium
  • 🔴 Hard

• Learning Journey:
  Each solution includes:

  • 🧠 Thought processes and approach
  • 🔍 Algorithms and data structures used
  • ⏱️ Time and space complexity analysis
  • 📚 Key insights and takeaways

---

📁 Folder Structure

IMPORTANT: This repository follows a specific structure. Please adhere to it when contributing:

/LeetCode-Solutions
  ├── 1-two-sum/
  │   ├── README.md           # Problem description and explanation
  │   └── two-sum.py          # Solution code
  ├── 2-add-two-numbers/
  │   ├── README.md           # Problem description and explanation  
  │   └── add-two-numbers.cpp # Solution code
  ├── 15-3sum/
  │   ├── README.md           # Problem description and explanation
  │   └── 3sum.py             # Solution code
  └── README.md               # This file

Folder Naming Convention:

• Format: {question-number}-{question-name}/
• Use lowercase with hyphens for question names
• Examples: 1-two-sum/, 121-valid-palindrome/, 200-number-of-islands/

File Structure Inside Each Folder:

1. README.md - Contains:

   • Original problem statement
   • Approach explanation
   • Time/Space complexity analysis
   • Example walkthrough

2. Solution file - Named as {question-name}.py or {question-name}.cpp

   • Clean, well-commented code
   • Optimized solution preferred

---

🎉 Hacktoberfest 2025 - Open Source Contributions Welcome! 🎉

This repository is participating in Hacktoberfest 2025! We welcome contributors of all skill levels to help grow this comprehensive collection of LeetCode solutions.

📋 How to Contribute

Step 1: Prerequisites

• ⭐ Star this repository before making any contributions
• 🍴 Fork this repository to your GitHub account
• 📋 Register for Hacktoberfest 2025 at hacktoberfest.com

Step 2: Setting Up

# Clone your forked repository
git clone https://github.com/YOUR-USERNAME/leetcode-solution.git
cd leetcode-solution

# Create a new branch for your contribution
git checkout -b solution/problem-name

Step 3: Adding Your Solution

1. Create a folder following the naming convention: {number}-{problem-name}/
2. Add README.md with problem description and your approach
3. Add solution file: {problem-name}.py or {problem-name}.cpp
4. Ensure your code is well-commented and follows best practices

Step 4: Submit Your Contribution

# Add your changes
git add .

# Commit with a meaningful message
git commit -m "Add solution for Problem #123: Problem Name"

# Push to your fork
git push origin solution/problem-name

🚨 Contribution Guidelines - READ CAREFULLY

✅ What We Accept:

• New LeetCode solutions not already present in the repository
• Optimized versions of existing solutions with better time/space complexity
• Solutions in different languages (Python, C++, Java, JavaScript)
• Improved documentation and problem explanations
• Bug fixes in existing solutions

❌ What We DON'T Accept:

• Duplicate solutions (check existing folders first!)
• Solutions without proper folder structure
• Code without comments or explanations
• Spam or low-effort contributions
• Solutions that don't work or haven't been tested

📏 Quality Standards:

• Test Your Code: Ensure your solution passes on LeetCode before submitting
• Follow Structure: Adhere to the exact folder and file naming conventions
• Add Documentation: Include README.md with problem statement and approach
• Clean Code: Write readable, well-commented code
• One Problem Per PR: Submit separate pull requests for each problem

🔍 Before Contributing:

1. Check for duplicates: Search existing folders to avoid duplicate submissions
2. Read the problem: Understand the LeetCode problem thoroughly
3. Test locally: Verify your solution works with the given examples
4. Follow templates: Use the structure shown in existing solutions

🏷️ Pull Request Template

When creating your PR, please include:

• Problem number and name
• Approach used (e.g., Two Pointers, Dynamic Programming)
• Time and Space complexity
• Any additional notes or optimizations

🎯 Good First Issues

New to open source? Look for these types of contributions:

• Easy-level LeetCode problems
• Adding missing solutions in popular languages
• Improving documentation in existing solutions
• Adding complexity analysis to solutions

🚫 Anti-Spam Policy

• PRs that don't follow the guidelines will be marked as invalid
• Spam PRs will be labeled as spam and closed immediately
• Quality over quantity - focus on meaningful contributions

🏆 Recognition

All contributors will be acknowledged in our contributors section. Top contributors may be featured in repository highlights!

---

🤝 Code of Conduct

By participating in this project, you agree to maintain a respectful and inclusive environment. Be kind, helpful, and constructive in all interactions.

---

📞 Need Help?

• 🐛 Found a bug? Open an issue with details
• ❓ Have questions? Check existing issues or create a new one
• 💡 Suggestions? We'd love to hear your ideas!
• 😢 PR not approved? I tend to approve most PRs at night, in case your PR doesn't get approved timely tag me @Hsinha11 in the comments and I shall approve it, if it is fit :)

---

📊 Repository Stats

---

Happy Coding! Let's make this Hacktoberfest amazing together! 🚀

Remember: The goal is to learn, contribute, and grow together as a community. Every contribution, no matter how small, makes a difference!