I have been having this idea for a while now, but I don't know if it is viable or not, or if it has already been suggested before on Codeforces. As for AI cheating, can't Codeforces make an agreement with OpenAI and other AI companies for prohibiting their users from using AI to solve ongoing contests' problems? by providing the problems' statements beforehand to OpenAI for example, so that the ai would filter prompts related to them! I mean, of course there will still be a bunch of ways to override this rule when using ai, but at least this will eliminate the cheaters that literally copy-paste the problems' texts for a quick AC. Additionally, there can be improvements on the rules applied by OpenAI for eliminating online contests' cheaters in the future. What do you think? In case this idea has been suggested before, or in case I got something wrong, I would like to apologize for wasting your time. Thanks for reading :)