Nice problem

Правка en1, от RomeoFantastik, 2017-02-20 17:58:48

Hi guys! I have found this problem frot main.edu.pl, it seems quite interesting and I can't come up with some solution. http://main.edu.pl/en/archive/oi/19/hur Can you help me?

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en1 Английский RomeoFantastik 2017-02-20 17:58:48 191 Initial revision (published)