Hello, Codeforces!

I am pleased to invite you to participate in Codeforces Round 899 (Div. 2), which will be held on Sep/25/2023 17:35 (Moscow time).

All problems were written and prepared by me.

You will be given 5 problems, and one of them is divided into two subtasks. You will have 2 hours to solve them.

I would like to thank:

• irkstepanov for excellent coordination and Russian translation!

• Golovanov399 for providing useful feedbacks.

• kizen for helping me much with one problem of the contest.

• ko_osaga for Nutella testing.

• leinad2, Numbering, qwerasdfzxcl, kizen, Golovanov399 for Red testing.

• Kaling, Mingyu331, chaeyihwan, Kawaii2DIdolOfGSHS, azberjibiou, mjhmjh1104, DELTARUNE, wuhudsm, as_dfsdf for Orange testing.

• unordered_map, alex0211, gs20036, namolbbaemi, eeeDA, nlog for Purple testing.

• andyandy, JaewonOh, kongum, Coruncanius, ez_code, fs_edge, chromate00 for Blue testing.

• Hanlana18, papergundam, sjmjys954646 for Gray testing.

• MikeMirzayanov for great Polygon and Codeforces platforms!

• And last but not least, You for participating in the round!

Score distribution: $$$500 - 1000 - 1500 - 2000 - (2000 + 2000)$$$

UPD: Editorial is out.

UPD2: Congratulations to the winners!

Official Contestants

1. Lycorisqwq
2. zepto
3. vjudge39
4. Beelzebub_blue
5. _t_W_

Official + Unofficial Contestants

1. ksun48
2. jiangly
3. antontrygubO_o
4. Sugar_fan
5. KumaTachiRen Good luck and enjoy the round!