About AlgoViz

AlgoViz is a free, hand-drawn book of algorithms: animated, step-by-step walkthroughs of the Data Structures & Algorithms patterns that come up in coding interviews, with the running line of pseudocode beside every step and C++, Java and Python solutions.

It is made by Chirag Kushwaha, an independent developer. There are no accounts, no ads and no paywall — every walkthrough is free to read.

How the content is made

Each animation is generated by running the actual algorithm on a sample input and recording every step, so what you watch is the real trace, not a drawing of it. Problems are grouped by the pattern that solves them, from brute force to the optimal approach, with time and space complexity for each.

The source code is public on GitHub. Corrections and suggestions are welcome — see the contact page.