Give me an advice for C and D problems

Revision en2, by Chasty, 2015-08-18 02:46:51

Hi everyone. When I try to solve a C or D problem. it turn out to be difficult for me I dont know what to do. I spend almost all my time in those problems but without success.

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en2 English Chasty 2015-08-18 02:46:51 3
en1 English Chasty 2015-08-18 02:45:54 212 Initial revision (published)