AtCoder and Codeforces have officially merged, creating a single, unified competitive programming platform. Starting now, visiting the AtCoder website will redirect users to codeforces.com, and all AtCoder problems will be transferred to Codeforces over the next few days. This merger combines AtCoder’s high-quality problem sets with Codeforces’ large international community, offering programmers a broader range of challenges and a more extensive network for collaboration and competition. Users can expect a seamless transition with integrated contests and shared resources, enhancing the overall competitive coding experience for everyone involved.

I received this news early from a trusted Codeforces source, and Mike will officially announce it soon.