Help on #Codeforces_313 Div2 Problem C -"C. Gerald's Hexagon"

Revision en1, by question_id, 2015-07-23 22:21:30

I can figure out the short formula many contestant used and in TT(tutorial). Can anyone give me some explanation on this.. sketch etc. Thanks in Advance.

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en1 English question_id 2015-07-23 22:21:30 215 Initial revision (published)