Why lost a lot of AC on codeforces??

Revision en1, by Los_Angelos_Laycurse, 2015-12-31 03:45:39

can anyone give explaination, I don't know how to find the hardest problems on cf now.....

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en1 English Los_Angelos_Laycurse 2015-12-31 03:45:39 127 Initial revision (published)