HELP in a problem without tutorial

Revision en1, by _QWOiNYUIVMPFSBKLiGSMAP_, 2017-11-25 21:19:57

http://codeforces.com/contest/157/problem/D

or anyone comment with a link of a tutorial.

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en1 English _QWOiNYUIVMPFSBKLiGSMAP_ 2017-11-25 21:19:57 134 Initial revision (published)