Hello Codeforces,

You might remember me as the author of Pinely Round 4 (Div. 1 + Div. 2).

Today, I invite you to participate in IIMOC 2025, a month-long heuristic contest starting soon.

About the Problem

I authored the official problem for this contest, and I am very fond of it. The problem is designed to be easy to approach but extremely difficult to master.

• Good Skill Differentiation: Whether you are a beginner or an expert, the problem will challenge you appropriately.

• High Quality Tests: I tuned the test data to ensure the tests are strong and the grading is fast.

If you enjoy AtCoder Heuristic Contests, you will definitely enjoy this challenge.

Contest Info

• Timeline: Nov 22, 2025 — Dec 21, 2025.

• Divisions: While the main contest is for high school students, we have an Observer Division for university students and others.

• Prizes: Top teams (including Observers) will receive T-shirts.

Registration

Click here to Register (Google Form)

(Note: If you are not a high school student, please enter "observer" in the "Country" field.)

See you on the leaderboard!