Hello Codeforces!↵
↵
I'm glad to invite you to my first contest, [Murasame's Contest 1 (Div. 2.5)](https://mirror.codeforces.com/contestInvitation/bbbb4ddb6f3fc3f77ea467a10a06e35181e87b5f)! Whether you are looking to sharpen your skills or enjoy some interesting problems, everyone is welcome to join.↵
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The contest will start at [01.16.26 17:50 (UTC+8, China Standard Time)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Murasame%27s+Contest+1&iso=20260116T1750&p1=33) 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.↵
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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:↵
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- <a class="rated-user user-legendary" href="/profile/" title="Legendary Grandmaster You"><span class="legendary-user-first-letter">Y</span>ou</a> for participating in the contest.↵
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This is an ICPC-style contest, where every problem has the same weight, and every unaccepted non-CE submission will incur a penalty.↵
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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.↵
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### **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.↵
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### **UPD2: Congratulations to the winners**↵
↵
- 1st: [user:meta-circular,2026-01-29]↵
- 2nd: [user:dooglius,2026-01-29]↵
- 3rd: [user:hardworkiskey_1308,2026-01-29]↵
- 4th: [user:TheCodeDominator,2026-01-29]↵
- 5th: [user:NPsolved.cpp,2026-01-29]↵
- 6th: [user:WA_ON_TEST_2,2026-01-29]↵
- 7th: [user:sidat,2026-01-29]↵
- 8th: [user:KinaRight,2026-01-29]↵
- 9th: [user:Patilaniruddha,2026-01-29]↵
- 10th: [user:Pip,2026-01-29]↵
↵
Editorial will be available soon.↵
↵
### **UPD3: Editorial is out!**↵
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Check it here (pdf): https://file.murasame.site/shared/cp/cf/contest-1-solution.pdf
↵
I'm glad to invite you to my first contest, [Murasame's Contest 1 (Div. 2.5)](https://mirror.codeforces.com/contestInvitation/bbbb4ddb6f3fc3f77ea467a10a06e35181e87b5f)! 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)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Murasame%27s+Contest+1&iso=20260116T1750&p1=33) 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:↵
↵
- <a class="rated-user user-legendary" href="/profile/" title="Legendary Grandmaster You"><span class="legendary-user-first-letter">Y</span>ou</a> 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: [user:meta-circular,2026-01-29]↵
- 2nd: [user:dooglius,2026-01-29]↵
- 3rd: [user:hardworkiskey_1308,2026-01-29]↵
- 4th: [user:TheCodeDominator,2026-01-29]↵
- 5th: [user:NPsolved.cpp,2026-01-29]↵
- 6th: [user:WA_ON_TEST_2,2026-01-29]↵
- 7th: [user:sidat,2026-01-29]↵
- 8th: [user:KinaRight,2026-01-29]↵
- 9th: [user:Patilaniruddha,2026-01-29]↵
- 10th: [user:Pip,2026-01-29]↵
↵
Editorial will be available soon.↵
↵
### **UPD3: Editorial is out!**↵
↵
Check it here (pdf): https://file.murasame.site/shared/cp/cf/contest-1-solution.pdf
