Targeted review
Library
Use the library after a rep exposes a gap. Complete solutions are references, not a substitute for writing the reasoning, code, and tests yourself.
Algorithms
Complete implementations grouped by pattern, with complexity notes and tests.
Reference Sheets
Compact lookups for Python, data structures, patterns, complexity, and interview method.
Advanced Exercises
Code-reading and decomposition exercises for practical engineering rounds.
Printables
The booklet and individual sheets for offline review and board-style practice.