DSA Pattern Problems 🎨

A comprehensive collection of pattern printing problems commonly asked in Data Structures and Algorithms interviews and competitive programming.

📋 Table of Contents

• About
• Patterns Included
• How to Use
• Pattern Categories
• Contributing
• License

🎯 About

This repository contains well-documented pattern printing problems with:

• Clean, readable code
• Time and space complexity analysis
• Visual output examples
• Proper naming conventions

Perfect for:

• Interview preparation
• Learning nested loops
• Understanding pattern logic
• Practice for competitive programming

📦 Patterns Included

Basic Star Patterns

1. Right-aligned Triangle (Decreasing)

   *****
   ****
   ***
   **
   *
   

2. Right-aligned Triangle (Increasing)

   *
   **
   ***
   ****
   *****
   

3. Left-aligned Triangle

       *
      **
     ***
    ****
   *****
   

4. Full Pyramid

       *
      ***
     *****
    *******
   *********
   

5. Inverted Pyramid

   *********
    *******
     *****
      ***
       *
   

6. Hollow Rectangle

   *******
   *     *
   *     *
   *     *
   *******
   

7. Diamond Pattern

       *
      ***
     *****
    *******
   *********
    *******
     *****
      ***
       *
   

8. Half Diamond Star Pattern

   *
   **
   ***
   ****
   *****
   ****
   ***
   **
   *
   

Number Patterns

9. Number Triangle (Decreasing)

   12345
   1234
   123
   12
   1
   

10. Increasing Number Triangle

    1
    2 3
    4 5 6
    7 8 9 10
    11 12 13 14 15
    

11. Binary Number Triangle

    1
    0 1
    1 0 1
    0 1 0 1
    1 0 1 0 1
    

12. Number Crown Pattern

    1        1
    12      21
    123    321
    1234  4321
    1234554321
    

🚀 How to Use

1. Clone the repository

   git clone https://github.com/Powar-Goutxm/dsa-patterns
   cd dsa-patterns

2. Compile and run Basic Patterns

   javac BasicPatterns.java
   java BasicPatterns

3. Compile and run Number Patterns

   javac NumberPatterns.java
   java NumberPatterns

4. Modify for custom input

   // In main method, change the parameter
   right_pattern_reverse(10);  // For a triangle of size 10

📚 Pattern Categories

Available

• ✅ Basic Star Patterns (8 patterns)
• ✅ Number Patterns (4 patterns)

Coming Soon

• Character Patterns (Alphabet triangles)
• Butterfly Patterns
• Wave Patterns
• Spiral Patterns

🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

1. Fork the repository
2. Create your feature branch (git checkout -b feature/NewPattern)
3. Commit your changes (git commit -m 'Add some pattern')
4. Push to the branch (git push origin feature/NewPattern)
5. Open a Pull Request

Contribution Guidelines

• Follow existing code style
• Add proper documentation
• Include time/space complexity
• Add visual examples in comments
• Test your patterns thoroughly

📝 License

This project is licensed under the MIT License - see the LICENSE file for details.

🌟 Show your support

Give a ⭐️ if this project helped you!

📧 Contact

Goutam Powar - goutampowar005@gmail.com

Project Link: https://github.com/Powar-Goutxm/dsa-patterns

---

Happy Coding! 💻