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Show HN: AlgoDrill – Interactive drills to stop forgetting LeetCode patterns

henwfan Tuesday, December 09, 2025

I built AlgoDrill because I kept grinding LeetCode, thinking I knew the pattern, and then completely blanking when I had to implement it from scratch a few weeks later.

AlgoDrill turns NeetCode 150 and more into pattern-based drills: you rebuild the solution line by line with active recall, get first principles editorials that explain why each step exists, and everything is tagged by patterns like sliding window, two pointers, and DP so you can hammer the ones you keep forgetting. The goal is simple: turn familiar patterns into code you can write quickly and confidently in a real interview.

https://algodrill.io

Would love feedback on whether this drill-style approach feels like a real upgrade over just solving problems once, and what’s most confusing or missing when you first land on the site.

Summary
AlgoDrill is an online platform that offers coding challenges, educational resources, and a community for developers to improve their problem-solving and algorithmic skills. The platform provides a range of practice problems, tutorials, and tools to help users enhance their coding proficiency.
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Summary
algodrill.io
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