As a new competitive programmer on AtCoder, I want to understand the algorithm rating system. Can you tell me the initial rating for new users, how ratings change after contests, and list the different rating color ranges with their corresponding numerical values? Please find this information within the website's 'Guide' section.
Navigate to the AtCoder homepage (atcoder.jp). Scroll to the bottom of the page and click on the 'Guide' link. On the Guide page, locate the section or article that explains the 'Algorithm' rating system. Extract the initial rating for new users. Identify how ratings change after contests (increase/decrease based on performance). List at least three different rating color ranges and their associated numerical values. Synthesize all collected information into a concise answer.
The agent successfully navigates to the 'Guide' page. The agent successfully locates the section detailing the 'Algorithm' rating system. The agent states that the initial rating for new users is 0. The agent explains that ratings change based on contest performance (e.g., higher performance increases rating, lower performance decreases it). The agent lists at least three different rating color ranges and their associated rating values (e.g., Gray: ~399, Brown: 400~799, Green: 800~1199, Blue: 1200~1599, Yellow: 1600~1999, Red: 2000~2399, Orange: 2400~2799, Cyan: 2800~).