We will hold UOJ Round #29 contest! The contest contains $$$3$$$ problems to be solved in $$$4$$$ hours.

King Volt of the Fleas decided to establish a brand-new academic discussion community called "Flea Universe". However, during the process of building the community, Volt encountered some technical difficulties. Can you help Volt overcome these difficulties and contribute to creating a new academic discussion community for the Flea Kingdom?

• Contest link: https://uoj.ac/contest/94
• Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20250216T1800&p1=33&ah=4
• Writers: Gellyfish, orzdevinwang, dXqwq, xyf007
• Testers: yaoxi, registeretsiger
• Duration: 4 hours
• Difficulty: like CF Div.1 contests (maybe slightly harder)
• The point values: 100-100-100

The contest will follow the Pretest rules: During contest, every submission will only be judged on the pretests (in the problem attachments). All submissions will be rejudged on the final tests after contest. All the problems will have subtasks, the final score will be based on the last submission.

The contest is rated for everyone, you will be count as rated only if you opened at least one problem.

We are looking forward to your participation!

UPD1: The contest will start in 40 minutes.

UPD2: Congratulations to the winners!

1. liuhengxi
2. hhoppitree
3. jiangbowen
4. zjy2008
5. cmk666