This repository is my personal library of coding patterns — reusable algorithmic approaches that can be applied to solve multiple problems on platforms like LeetCode, Codeforces, HackerRank, or in real-world projects.

The main goal is to understand, memorize, and quickly recognize these patterns during problem-solving, instead of relying on random guesswork.

I've solved hundreds of algorithmic problems, but noticed a repeating truth:

Many problems are just variations of the same core patterns.

The real skill isn't just solving one problem — it's recognizing the underlying technique instantly, and applying it in your own style.

This repo is designed to:

• Build my personal algorithmic muscle memory 🧠
• Document patterns with clear explanations
• Provide multiple code implementations for each pattern
• Categorize patterns for quick navigation
• Create a long-term reference for myself and others

Each pattern has:

1. README section explaining:
   • When to use the pattern
   • Time/space complexity
   • Common pitfalls
2. Example problems (3–5 per pattern)
3. Solutions in C# (my main language), sometimes with Python/Java for comparison
4. Pattern Variations if applicable

When to use:

• Problems involving subarrays/substrings
• Optimizing repeated range calculations
• Fixed-size or dynamic ranges

Advantages:

• Reduces O(n²) solutions to O(n)
• Simplifies logic for continuous segments

Common mistakes:

• Forgetting to update the window after moving pointers
• Not handling edge cases (empty arrays, single elements)

Example Problems:

• Find the maximum sum of k consecutive elements
• Longest substring without repeating characters
• Minimum size subarray sum

• Two Pointers
• Sliding Window
• Prefix Sum
• Binary Search Patterns
• Greedy
• Dynamic Programming Templates
• Graph Traversal (BFS/DFS)
• Backtracking
• Heap/Priority Queue
• Hashing Tricks

1. Pick a pattern from the list
2. Read the theory & common use cases
3. Go through the example problems
4. Implement them without looking at the solution
5. Compare with my solution & note any improvements

This project is licensed under the MIT License — you are free to use, modify, and share the code, but please credit the author.

• Expand examples for competitive programming
• Add a "micro patterns" section (tiny reusable tricks)
• Compare performance of different approaches for the same problem

I'm a developer focused on mastering algorithms and data structures, not just for interview prep, but to be able to solve any problem from scratch, in my own way.
This repository is a key part of that journey.