Less than 2 hours left until the Sirius Qualification Round! Register now!

[Prizes RF Only / Statements EN & RU]

⚠️ NOTICE FOR INTERNATIONAL USERS

All problem statements will be fully available in both English and Russian! You are more than welcome to participate and solve the problems. Please note that physical prize delivery is strictly limited to the Russian Federation via Ozon, but everyone can compete for fun, rating, and practice!

Good day, dear Codeforces users!

This is a reminder that in less than 2 hours (at 17:35 Moscow time, UTC+3), the Qualification Stage of our contest series based on Sirius Educational Centre problems will begin!

High Chance to Win a Prize!

Right now, the registration activity is VERY low. This means competition is minimal, and it will be extremely easy to grab the prizes in the final round! Don't miss this perfect opportunity.

IMPORTANT RULE: Users who do not participate in today's qualification round will NOT be eligible for prizes in the finals. Even if you plan to write the final round later, you must go through this qualification to compete for prizes. Register now!

⚙️ About the Scoring System (IOI rules)

The contest runs under IOI rules, which differ significantly from the standard ICPC (Codeforces) format: * Partial Scoring: There are 7 problems, worth 100 points each. Problems are divided into subtasks. You get points for each test case or group of test cases you pass (details are in the problem notes). * Full Evaluation: If your solution gets WA, TLE, MLE, or any other error on a specific test, the grading process does not stop. Your solution will be tested on absolutely all test cases in the set. * No Penalty Time: The submission time and the number of attempts do not affect your final score. You can resubmit your code as many times as you want, and your best score for each problem will be counted. * Standings Ranking: Participants are sorted by the number of problems solved with a score of 80+ points. In case of a tie, the total sum of points is used.

Key Details:

• Format: 7 problems, IOI scoring system.
• Duration: Exactly 3 hours (17:35 — 20:35 MSK, UTC+3).
• Registration Link: Register for the Qualification Stage

For rating restrictions (max rating <=1900 for DSA-Advanced, <=1600 for DSA-Basic) and full rules, check the main announcement.

Acknowledgments

Special thanks to my friend and tester — zeyd1234 for preparing the round! Without his help, none of this would have been possible.

Thank you all, and see you at the round! Good luck!