LEARN PATTERNS, NOT PROBLEMS
Most platforms throw 3,000 problems at you and hope something sticks. We teach you the 22 patterns that solve them all.
THREE TRACKS
CODING BASICS
Build your foundation with 12 categories of pre-algorithm problems. Strings, arrays, recursion, sorting — the building blocks you need before tackling patterns.
12 categoriesALGORITHMS
Master 22 algorithm patterns across 3 tiers. Each pattern includes curated problems with starter code, test cases, and solutions in 5 languages.
22 patterns · 3 tiersPATTERN RECOGNITION
The real interview skill: reading a problem and knowing which pattern to apply. 176 quiz questions that train your pattern-matching instincts.
176 questionsBUILT FOR DEPTH
AI Hints
Stuck? Get progressive hints from Claude AI that guide you toward the solution without giving it away.
5 Languages
Write and run code in Python, JavaScript, TypeScript, Java, or Go. Every problem has starter code and solutions in all five.
Spaced Repetition
SM-2 algorithm schedules reviews at the right intervals so patterns stick in long-term memory.
Reference Cards
Quick-reference pages for every pattern with API cheatsheets, code recipes, and complexity tables.
Guided Curriculum
Problems are ordered by difficulty within each pattern. Foundations first, then intermediate, then advanced.
Real Code Execution
Run your code against test cases in a sandboxed environment. See output, errors, and test results instantly.