13 patterns · 144 problems
Stop grinding random problems. Learn the patterns.
PatternDeck organises interview prep into the thirteen patterns that actually repeat — and keeps your progress in sync on every device.
13 curated patterns
Arrays to dynamic programming, each with a hand-picked problem set.
Progress that sticks
Overall and per-pattern bars update the moment you tick a problem.
Instant search
Filter every problem by title, pattern or difficulty.