One of my best problems which cannot be used anymore

Правка en3, от ABalobanov, 2023-03-25 14:46:53

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 codeforces 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 from some old round). Now I just post it here so feel free to solve it and post your solutions. Later I can write my solution. 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

История

 
 
 
 
Правки
 
 
  Rev. Язык Кто Когда Δ Комментарий
en3 Английский ABalobanov 2023-03-25 14:46:53 57 (published)
en2 Английский ABalobanov 2023-03-25 14:43:32 804
en1 Английский ABalobanov 2023-03-25 14:33:03 380 Initial revision (saved to drafts)