Grind69

🚀 69 hand picked coding problems to ace your next interview
Learn algorithms and data structures through real interview problems, instant feedback, and collaborative learning.

Yeah, we know what 69 means, now go solve a DP problem!

Everything you need to succeed
From beginner-friendly problems to advanced algorithms, we've got you covered.


Real Interview Problems
Practice with actual problems from Google, Meta, Amazon, and other top tech companies.


Instant Feedback
Get immediate AI-powered feedback on your solutions with detailed explanations and optimizations.


Editorial solutions
Find solutions for each problem with step-by-step explanations and code examples.


Full-Featured Online Code Editor
Run and test your code instantly in the browser — no setup required.


Need hints?
Get curated hints to guide you through solving problems without giving away the answer.


Study plan
Follow a structured study plan to master algorithms and data structures.

💻 Full-Featured Online Code Editor
Run and test your code instantly in the browser — no setup required.
Our editor supports the most popular interview languages.

🎯 Practice Problems That Matter
Cover every key topic, from arrays and graphs to advanced dynamic programming

✨ Get help with AI
Get hints and feedback on your solution, ask any questions you want.

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Hello! I am your AI assistant. How can I help you with your code?

What is wrong with my code?

Your fizz_buzz function has a small logical issue with the order of its if statements. The condition for fizzbuzz will never be met as currently written. Think about how the conditions are evaluated from top to bottom.

Ready to ace your next interview?