FeatCode gives you a step-by-step roadmap through data structures & algorithms, plus the Blind 75 problem set — every problem paired with a free video walkthrough.
No fluff — just a proven path and the problems that matter most.
Learn patterns in the right order — from arrays & hashing to dynamic programming — so every new topic builds on the last.
The exact 75 problems that cover the patterns interviewers actually test, grouped by topic and difficulty.
Every problem links to a free, high-quality video walkthrough so you're never stuck without an explanation.
Check problems off as you solve them. Sign in and your progress follows you across every device.
Filter by pattern or difficulty, or search by name, to focus your practice exactly where you need it.
A clean, fast, responsive site that works just as well on your phone during a commute as it does at your desk.
Follow the roadmap from the beginning, or jump straight into the problem set.