Help me understand this editorial!!

Правка en1, от question_id, 2015-06-27 08:31:13

Hi!! I am facing problem to understand the problem C of following editorial. It will be helpful if anyone help on this: http://codeforces.me/blog/entry/7287

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en1 Английский question_id 2015-06-27 08:31:13 195 Initial revision (published)