One of my best problems which cannot be used anymore

Revision en2, by ABalobanov, 2023-03-25 14:43:32

Hi to everyone! I decided to create a blog with some problem which was invented by me several years ago and only simple version of it was used in municipal stage of all-russian school olympiad in Kaliningrad. I wanted to use it somewhere but now I understand that it is not possible anymore because very very similar problem with similar ideas was used in codeforcea round 858(it was f1-f2). I should have used it earlier somewhere and it is my second time that I lost my problem(first was div2 C). Now I just post it here so feel free to solve it and post your solutions. Warning: if you haven't participated in round 858 and want to do it virtually or just solve problems from there then I advice you not to read it because you may get spoilers.

Problem

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  Rev. Lang. By When Δ Comment
en3 English ABalobanov 2023-03-25 14:46:53 57 (published)
en2 English ABalobanov 2023-03-25 14:43:32 804
en1 English ABalobanov 2023-03-25 14:33:03 380 Initial revision (saved to drafts)