Codeforces Beta Round #16 (Div 2 Only)

Revision en2, by Lamductan, 2016-02-24 19:32:15

Can anyone explain me solution of the Problem E? I tried to read some codes but I can't find out the main idea! Thanks for your help!

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en2 English Lamductan 2016-02-24 19:32:15 2
en1 English Lamductan 2016-02-24 18:22:17 217 Initial revision (published)