Hello, Codeforces!
We are pleased to announce the resumption of the Global Rounds. Thanks to XTX Markets for supporting the initiative! In 2024, we will hold 4 such rounds. The series results will take into account the best 3 participations out of 4.
On Dec/19/2024 17:35 (Moscow time) we will host Codeforces Global Round 28. 
Codeforces Global Round 28 marks the fourth round in the 2024 series of Codeforces Global Rounds. These rounds are open and rated for everyone.
The prizes for this round are as follows:
- The top 30 participants will receive a t-shirt.
- 20 t-shirts will be randomly distributed among participants ranked between 31 and 500, inclusive.
The prizes for the 4-round series in 2024:
- In each round, the top-100 participants get points according to the table.
- A participant's final score will be the sum of the points they earned in their 3 highest-placing rounds.
- The top 20 participants across the series will receive sweatshirts and placement certificates.
We extend our gratitude to XTX Markets for supporting the global rounds initiative in 2024!
The 9 problems were authored by our 4 authors: JoesSR, cmk666, wsyear and Little09.
We would also like to thank:
- Our coordinator 244mhq.
- Our friends who discussed the task with us zjy2008, Zhouershan, LXH-cat, 5ab, cyb1010.
- Our testers orzdevinwang, Um_nik, 275307894a, A_G, JCY_, A_zjzj, umbrella-leaf, wyrqwq, zltzlt, Daniel777, Error_Yuan, lgswdn, gyydp123_LIM, Daniel081024, omeganot, jimmyywang, Meatherm, operator_, Imdie, chengcheng5677, Xiaohuba, ikira.57, Hanghang007, Chenly, angryarabianman, 0x4f, Hori, OME_, huangyuheng, newb_programmer, CuteWhite, Abracadaber, Union_of_Britain, ishaandas1, dazlersan1, OIer_Chtholly.
- 244mhq for translating the statements to Russian.
- MikeMirzayanov for creating the Codeforces platform.
Round Information:
- Duration: 180 minutes.
- Number of problems: 9 problems with 1 subtask.
- Score distribution: $$$ 250 - 500 - 1000 - 1250 - 1750 - 2000 - 2250 - 2750 - (3000 + 3000) $$$.
We eagerly anticipate your participation!
UPD:
Congrats to the winners!
First Solves:
A: dXqwq
B: dXqwq
C: Marcin_smu
D: jiangly
E: sevlll777
F: dXqwq
G: BlackLily
H: jiangly
I1: jiangly
I2: nobody solved
UPD2: Editorial.
