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⚠️ The English translation of this repo is still in progress. For the original Chinese version, please visit krahets/hello-algo.

Animated, runnable, and interactive crash
course for data structures and algorithms.

Read Online   |   Download PDF

This project aims to create a free, open-source, and beginner-friendly crash course for data structures and algorithms.

• Animated illustrations, easy-to-understand contents, and a smooth learning curve help beginners explore the "knowledge map" of data structures and algorithms;
• Run code with just one click, help readers improve their programming skills and understand the working principle of algorithms and the underlying implementation of data structures;
• We encourage readers to help each other. Questions and comments are usually answered within two days;

If you find this book helpful, please give it a Star ⭐ to support us, thank you!

"An easy-to-understand introductory book on data structures and algorithms, which guides readers to learn by thinking and practicing, strongly recommended for algorithm beginners."

—— Junhui Deng, Professor of Computer Science, Tsinghua University

"If I had Hello Algorithm when I was learning data structures and algorithms, it would have been 10 times easier!"

—— Mu Li, Senior Principal Scientist, Amazon

We are accelerating the update of this book. You are welcome to participate in this project by submitting a Pull Request to help other readers get better learning content.

• If you find any errors in the text (grammar, spelling, failed links, etc.), please help us fix them or let us know in the comments;
• We would love to invite you to contribute in code translation for C++, Python, Go, JavaScript, TypeScript, C, C#, Swift, Zig, Rust, Dart, etc.;
• We appreciate your valuable comments and inputs to this book. If you have any questions, please submit an Issue or contact via WeChat: krahets-jyd;

We would like to dedicate our thanks to all the contributors of this book:

The texts, codes, images, photos, and videos in this repository are licensed under CC BY-NC-SA-4.0.