AtCoder Regular Contest (ARC) will primarily be held in the traditional format (rated 1200–2799) starting from ARC215.

Div.1/Div.2 will be renamed to "AtCoder Regular Contest ++" / "AtCoder Regular Contest --" respectively, and will continue to be held.

The format for each Division will be adjusted as follows.

• ARC++
  • Rated range: 1600–2999
  • Contest duration: 150 minutes
  • Problems: 4–5 problems worth approximately 600–1000 points
• ARC
  • Rated range: 1200–2799
  • Contest duration: 120 minutes
  • Problems: 5–6 problems worth approximately 400–800 points
• ARC--
  • Rated range: 800–2399
  • Contest duration: 120 minutes
  • Problems: 6–7 problems worth approximately 300–700 points

For details, please see this post.