Kindly upload your codes by putting into a seperate folder/repo. The name of the folder/repo should be the topic name or your name (In case you want to contribute multiple repos.)
You can contribute any piece of code in any language you're comfortable in to this repository, it could be anything from a simple CP problem solution to some dynamic approach problems. You can go as wild as you can be in this concern.
First, register at hacktoberfest.digitalocean.com. Then, submit at least four pull requests to any public GitHub repository. You can look for open issues labeled Hacktoberfest for inspiration. Quality contributions are encouraged!
Are you maintaining a repo? Create issues or label existing ones with Hacktoberfest on your GitHub projects to help new contributors know what to work on. Tag any spam or irrelevant pull requests with the invalid label to disqualify them.
Log in with your GitHub account at hacktoberfest.digitalocean.com to check your progress and stats.