How can i develop my skill to solve problem C & D in div 2?

Revision en1, by flash_7, 2015-07-16 14:04:10

I'm struggling to solve problem C in Codeforces div 2 round.I can solve B very quickly but barely solved problem C.Can anyone give me some suggestions how can i prepere myself to gain the capability to solve problem C?

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en1 English flash_7 2015-07-16 14:04:10 277 Initial revision (published)