LinnnCode

Practice Coding and Problem-Solving Online

Inspiration

During our years as undergrads, we found that often times the courses were too theoretical, and often times lack of practice. We want to build this platform in order to provide a platform for every student who's passionate about practicing coding to do the practice problems online.

What it does

Our platform is an online coding platform similar to LeetCode/Hackerank, it has a user interface where users can log in, register, view problems, and try out the problems. We embedded a code editor into our platform, and users can submit their code and see the results/feedback in real time! We aim to support 2 languages including Python and C++. Where we implement the judge system from scratch.

How we built it

We use HTML, CSS, Bootstrap, and JavaScript for the front end. And we use Python Django, SQLite, and C++ in the backend.

Challenges we ran into

Compiling the users' codes on the server without sandboxing is quite dangerous, we used the Python subprocess to solve this problem. Also supporting two or more languages like Python and C++ means we have to write more drivers and find good design patterns to prevent duplicate codes.

Accomplishments that we're proud of

We successfully implemented the judge system for C++ and the submission viewing functionalities. We also had a chance to practice building a mini C++ test framework from scratch(for the judge system). It was a challenging but fun experience.

What we learned

We learned how to implement an online judge system, and how to integrate the frontend submission to our backend judge server. We also had a chance to practice frontend skills by embedding an editor.

What's next for LinnnCode

We aim to support multiple languages(add more drivers!) and add a to-do list functionality where users can self-assign (potentially assigned by others) the problems they want to solve. We also aim to improve the submission viewing system by adding comment blocks.