Data Structures & Algorithms
A data structures and algorithms course built for coding interviews. You learn the thirteen patterns behind the questions (binary search, two pointers, sliding window, graphs, dynamic programming and the rest), each with runnable practice problems you solve in the browser, not a problem list to grind.
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Getting Started
Introduction
Course Curriculum
Common questions
What does this data structures and algorithms course cover?
The thirteen patterns behind almost every coding-interview question: binary search, two pointers, sliding window, stacks and queues, depth-first and breadth-first search, graphs, tries, intervals, heaps, backtracking, bit manipulation and dynamic programming. Every pattern comes with runnable practice problems you solve in the browser.
How should I prepare for a coding interview?
Learn the patterns, not a thousand problems. Most coding questions are one of a dozen shapes in a costume, and once you recognise binary search or a sliding window in the first ninety seconds, the solution follows. This course teaches that recognition first, then drills it on real problems until it is automatic.
Is this a good LeetCode alternative?
LeetCode hands you thousands of problems and no order to solve them in. This data structures and algorithms course is the structured version: the underlying pattern first, then the problems that drill it, so practice compounds instead of feeling random.
Which lessons are free?
Every pattern opens with free lessons that teach the core idea and a worked example. Premium unlocks the full solutions and the harder practice problems across all thirteen patterns.