Hello Codeforces!

We are excited to invite you to participate in Algo Beat Contest 008 & WWOI Round 3, which is a Rated open contest hosted on Luogu. The contest will take place on May 24, 2026 at 14:00 (UTC+8).

Official English statements will not be provided, you may use AI for translation.

Clarification: Although our contest name is "Algo Beat Contest", this contest is completely independent and has no affiliation whatsoever with AtCoder Beginner Contests.

Contest Details

• URL: https://www.luogu.com.cn/contest/324945
• Format: IOI rules (partial scoring/subtasks are enabled)
• Duration: 4 hours
• Problems: 4 algorithmic tasks
• Difficulty: Roughly ranges from Luogu Yellow (≈ CF *1200) to Purple (≈ CF *2400)
• Rules: Any form of AI assistance to solve the problems is strictly forbidden (using AI purely for translation is allowed). If you are caught cheating, you'll be disqualified and granted a "Cheater" badge on Luogu for 14 days

The problems may be NOT sorted by difficulty, so we highly recommend that you read all the problems and not get stuck on the first ones.

This contest would not have been possible without the hard work of our team. We would like to sincerely thank:

• Gold14526 for excellent coordination and patiently reviewing the contest.
• Shadow_T for being the lead organizer.
• Shadow_T, Yuchang_Zhu, Murasame-chan for writing the problems
• wangzeyu2013, Shadow_T, wswwtx, LadyMisserina, joe_zxq for testing the problems and providing practical feedback.

Prizes

We are offering a total prize pool of 80 RMB for the participants!

First Bloods (First Accepted Submission):

• A: 5 RMB
• B: 5 RMB
• C: 5 RMB
• D: 10 RMB

Rank Rewards:

• 1st Place: 20 RMB
• 2nd Place: 10 RMB
• 3rd Place: 10 RMB
• 4th Place: 5 RMB
• 5th Place: 5 RMB

Lucky Draw:

We will randomly select 5 participants with non-zero scores, drawing one from each of the following rank ranges: $$$[1, 5], [1, 20], [1, 50], [1, 100], [1, 250]$$$. Each lucky winner will receive 2 RMB.

Please note that all prizes will be distributed via domestic Chinese payment methods (such as WeChat Pay or Alipay). If a participant wins but cannot receive the prize, the prize will roll over to the next eligible participant in the standings. Cheaters will be strictly disqualified.

Good luck, have fun, and see you on the standings!

Useful links:

• A tutorial on using Luogu (Please note that #pragma GCC optimize is currently banned on Luogu for contest fairness.)