Hello Codeforces!

I'm glad to invite you to my first contest, Murasame's Contest 1 (Div. 2.5)! Whether you are looking to sharpen your skills or enjoy some interesting problems, everyone is welcome to join.

The contest will start at 01.16.26 17:50 (UTC+8, China Standard Time) and last for 8 days. There are 5 problems in total, with difficulty ranging from Div. 3 to Div. 2 (I guess). All the problems are authored by me.

Since this is a long contest, feel free to solve the problems at your own pace. I hope you find the problem set interesting and educational.

I would like to thank the following people for making the contest possible:

• You for participating in the contest.

This is an ICPC-style contest, where every problem has the same weight, and every unaccepted non-CE submission will incur a penalty.

Good luck and have fun!

About how to register: Open https://mirror.codeforces.com/contestInvitation/bbbb4ddb6f3fc3f77ea467a10a06e35181e87b5f, click "Register" on the right, then click "Enter" on the left to enter the contest.

UPD: statement for E has been changed

The previous statement was incorrect due to AI's misinterpretation during the statement translation. I manually fixed it and your penalties on problem E (before the fix) have been removed. Apologies for the bad experience.

UPD2: Congratulations to the winners

• 1st: meta-circular
• 2nd: dooglius
• 3rd: hardworkiskey_1308
• 4th: TheCodeDominator
• 5th: NPsolved.cpp
• 6th: WA_ON_TEST_2
• 7th: sidat
• 8th: KinaRight
• 9th: Patilaniruddha
• 10th: Pip

Editorial will be available soon.

UPD3: Editorial is out!

Check it here (pdf): https://file.murasame.site/shared/cp/cf/contest-1-solution.pdf