As announced in the [previous update to our generative AI rules](https://atcoder.jp/posts/1369), ARC Div. 1 was previously exempt from the scope of the [AtCoder Rules against Generative AI](https://info.atcoder.jp/entry/llm-rules-en). However, as the performance of generative AI has improved, it is now capable of correctly solving a significant portion of the easier problems in ARC Div. 1. Accordingly, ARC Div. 1 will now be subject to this rule. As a result, we have made changes to the rule text. The main changes are as follows: - Replaced "ARC Div. 2" with "ARC" For detailed differences, please check [here](https://github.com/atcoder/rules/commit/ccc78470ccfe7cc3cd561cdd06bf98744a7b690f).