I can`t solve C in div. 2 rounds

Revision en1, by RomkaRS, 2023-03-08 14:45:26

I can`t solve C in div. 2 rounds. I reached a final on main olympiad in my country, but it doesn't help. What should I do?

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en1 English RomkaRS 2023-03-08 14:45:26 154 Initial revision (published)