Could anyone please share their ideas for solving problem I: Interesting Interactive Idea from the 2016-2017 NEERC Moscow Subregionals.
I have not been able to make any progress for quite some time and would appreciate any help.
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Bump. Just wanted to give this post one more shot before I resign myself to never solving this problem.
Solutions (in Russian): http://acm.msu.ru/uploads/2016/analysis.pdf