Once, someone asked me if it's legal to use ChatGPT in CF rounds. I suggested he not use it, because it may hamper his critical thinking. I know it's illegal to use published resources after the round starts. But ChatGPT is answering in real-time. Some people want to compare it with searching in Google. However, I know that ChatGPT matches the pattern with the existing data. Is there any official rule about using ChatGPT in CF rounds? If any, what is it? Update: Atcoder has published their generative AI rules for Atcoder Beginner Contests. Here it goes: https://info.atcoder.jp/entry/llm-abc-rules-en Should CF also do such a thing?