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HELP in a problem without tutorial

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

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

or anyone comment with a link of a tutorial.

History

Revisions

	Rev.	Lang.	By	When	Δ	Comment
	en1		_QWOiNYUIVMPFSBKLiGSMAP_	2017-11-25 21:19:57	134	Initial revision (published)