Hi Codeforces,

I built a small Chrome extension called CSES Friends Solver. I know there are already extensions out there for CSES, but I couldn't find any that specifically told you whether your friends have solved a particular problem. So I made one.

When you open any CSES problem page, a small box appears showing which of your friends have solved that problem and which haven't. Solved friends show a green check and appear at the top, unsolved ones show a red cross.

Setup is simple. Click the extension icon, enter a display name for your friend and their CSES user ID (the number you see in their profile URL like cses.fi/problemset/user/264530/), and you are done. The extension handles the rest automatically whenever you visit a problem page.

You can find it here: CSES Friends Solver

If you have any suggestions or want to contribute, PRs are very welcome. One thing I have been thinking about is adding problem tags to the UI so you can see the topic right on the problem page without having to look it up separately. If anyone wants to work on that or has a good idea for how to source and maintain the tags, I would love to hear from you in the comments.