krahets/hello-algo

This repository is the source for an open-source, free book called Hello Algo, an introductory tutorial on data structures and algorithms aimed at beginners. The description, in Chinese, says the book uses animated illustrations and one-click runnable code, and lists Simplified Chinese, Traditional Chinese, English, and Japanese as supported reading languages, with code samples in Python, Java, C++, C, C#, JavaScript, Go, Swift, Rust, Ruby, Kotlin, TypeScript, and Dart. According to the README, the book's goals are clear and beginner-friendly: every chapter pairs animated diagrams with prose so readers can build a mental map of each data structure or algorithm, and the source code that accompanies each section is structured so you can run it directly to experiment. The README also encourages readers to learn together by asking questions and sharing answers in the comments under each chapter on the project's website. The repo lists multiple ways to engage: read online on the hello-algo website, download a packaged release, or contribute by fixing content, translating chapters, or adding code in additional languages. The repository is organized so the same explanations are mirrored in each natural language, and the same algorithms are implemented separately in every supported programming language. You would use this repository if you want to learn data structures and algorithms from scratch, or revisit them in a language you actually code in. The code is licensed under CC BY-NC-SA 4.0. The repository's primary language listed on GitHub is Java, reflecting one of many code-implementation tracks rather than a single required runtime.