Hello Codeforces!

Following up on our initial announcement, we are excited to share that the Practice Phase for the IIMOC × FrontierCS 2026 Global Optimization Marathon is now officially open!

The practice problems are a curated subset of the FrontierCS benchmark designed to help you set up your local environments and testing pipelines, understand the relative scaling (0–100) scoring system in action, and test your submissions.

Head over to iimoc.org to access the practice datasets and evaluation infrastructure, the real contest starts May 1.