Original Post on AtCoder

We have updated the generative‑AI rules in ABC,ARC,and AGC. In addition to this, we explicitly prohibit code obfuscation.

Rules

For the full rules, please see:

• AtCoder Rules against Generative AI — Version 20261014

Changes to the Rules

• If you want to use code created by generative AI during a contest, you should publish the code before the contest begins and include the URL in your submission.
• Code obfuscation is now explicitly prohibited.
• If you convert code to binary form and embed it, you must ensure that the original source code can be inspected. (applied from October 20th)

For the detailed diff, please see this.

(Edit on October 20): We added the rule about binary embedding. We also added more explanations.