About DSA Solutions

Why this site exists

When I started preparing for interviews, I noticed that virtually every LeetCode solution repository on GitHub focuses on C++, Python, or Java. C# — the primary language for millions of .NET developers — was an afterthought. Solutions written in C# were either scarce, inconsistently formatted, or missing altogether for newer problems.

DSA Solutions was built to fill that gap. Every solution is written in idiomatic C# using modern .NET APIs — PriorityQueue, SortedSet, Dictionary, pattern matching — the same way a .NET developer would write production code.

How solutions are written

Each solution follows a consistent structure designed to make it useful as a study reference, not just a code answer:

• Explanation first. Every page shows a plain-English explanation — why the algorithm works, what data structure is used, and how to recognise when to apply this pattern.
• Complexity stated explicitly. Time and Space complexity are shown as badges on every solution page.
• Idiomatic C# code. Solutions use the most readable C# idiom available — not a Java translation. The goal is code that a .NET engineer would write and be comfortable reviewing.
• Daily updates. New solutions for LeetCode and GeeksforGeeks POTD are added every day.

What you will find here

• 800+ clean C# LeetCode solutions covering Easy, Medium, and Hard difficulty
• 550+ Java GeeksforGeeks POTD solutions, updated daily
• Topic pages for 60+ DSA patterns (Array, DP, Trees, Graphs, and more)
• Difficulty filtering and instant search to find any problem in seconds
• Syntax-highlighted code with one-click copy on every page
• A full study guide covering the 30-day plan, C# tips, and interview strategy

Why Java for GFG?

GeeksforGeeks Problem of the Day is one of the most popular daily coding challenges in India, with a strong community of students and early-career developers. Solutions here are in Java — the most widely expected language for GFG submissions — and include the same explanation + complexity format as the LeetCode C# solutions.

About the author

Sivalingam Ramasamy is a software developer based in Chennai, India, with experience in .NET, C#, and full-stack development. He began solving LeetCode problems daily to sharpen his algorithmic thinking and started this site to share clean solutions with the broader .NET community.

The project is open-source under the MIT License and available on GitHub. Contributions, corrections, and alternative solutions are welcome via pull request.