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OpenGenus / Cosmos

Licence: gpl-3.0
Hacktoberfest 2021 | World's largest Contributor driven code dataset | Algorithms that run our universe | Your personal library of every algorithm and data structure code that you will ever encounter |

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The universe of algorithm and data structures

Cosmos is your personal offline collection of every algorithm and data structure one will ever encounter and use in a lifetime. This provides solutions in various languages spanning C, C++, Java, JavaScript, Swift, Python, Go and others.

This work is maintained by a community of hundreds of people and is a massive collaborative effort to bring the readily available coding knowledge offline.

Many coders ask me how to improve their own performances. I cannot say anything except "solve and review and prepare your library" - Uwi Tenpen

Make your fundamentals in Algorithms and Data Structure with these free resources:

Cosmic Structure

Following is the high-level structure of cosmos:

Each type has several hundreds of problems with solutions in several languages spanning C, C++, Java, Python, Go and others.


This is a massive collaboration. Hence, to keep the quality intact and drive the vision in the proper direction, we have maintainers.

Maintainers are your friends forever. They are vastly different from moderators.

Currently, we have 5 active maintainers and we are expanding quickly.

The task of maintainers is to review pull requests, suggest further quality additions and keep the work up to date with the current state of the world. 🌍

Check out our current maintainers


The success of our vision to bring knowledge offline depends on you. Even a small contribution helps. All forms of contributions are highly welcomed and valued.

Currently, we have over 1000+ contributors in Cosmos and over 2K+ contributors in sister projects of Cosmos.

When you contribute, your name with a link (if available) is added to our contributors list.

You can contribute by writing code, documentation in the form of installation guides and style guides, making Cosmos search friendly and many others. There are endless possibilities.

Additionally, you might want to take a look at this contributing guidelines before you make Cosmos better.

You may, also, refer to the available style guides before contributing code.


We believe in freedom and improvement. GNU General Public License v3.0

Note that the project description data, including the texts, logos, images, and/or trademarks, for each open source project belongs to its rightful owner. If you wish to add or remove any projects, please contact us at [email protected]