Hello Codeforces Community! I'm susenyang, and I'm excited to share a contest with you again!

This contest is The 15th Huazhong Agricultural University Programming Contest, an official contest hosted by my university. You will have $$$5$$$ hours to solve $$$13$$$ problems.The round will be hosted by rules of ICPC and the penalty is 20 minutes per wrong submission.

This year, I did not participate in problem setting; instead, I took part in the competition as a contestant. The following are the authors of this contest:

• A B: Jiangcheneee
• C F: vanadium-23
• D J H I K M: tryandtryagain
• E G: waszz123456
• L: WuHuaRou

We would like to thank:

• thisislike_fan, Yaimsea, OxyaneOH2, Silencer76, lishiya, Linear_L, eiruty, baka_killer_uuz for testing.
• MikeMirzayanov for the Codeforces and Polygon platform!

We provide PDF Statements and Tutorial in both English and Chinese. Since the problem authors are all Chinese, we have to use ChatGPT to translate it. If you are confused about any description in them, feel free to comment!

Additional: Link to the 14th.