We are three people (potentially five). A mix of professionals and programming enthusiasts. Java since that is what Sedgewick uses on his latest version of the book. I guess no one would object to you using a different language but then you wouldn't be able to complete all the exercises because the library used (for some of the exercises around plotting stuff mainly) is written in Java.

I will personally be doing some of the exercises in both Java and C because I want to play with implementing some of the data structures with pointers, etc.

To expand a bit more on background question, I made a similar post on Reddit yesterday and received an incredible amount of messages, but unfortunately had to filter out all but one because people didn't quite meet the requirements I am looking for, e.g. be interested in CS rather than the latest JS framework.

How about you? What is your background?

This is the book: https://www.amazon.com/Algorithms-4th-Robert-Sedgewick/dp/03...

If it helps, the book uses a "subset" of Java that is introduced in the first section of the book. You don't really need to be familiar with the language, though, you do need a programming background.