http://acm.timus.ru/problem.aspx?space=123&num=9&contest=true
I cann't not understand what the author really wants us to do?How to convert it into a pratical problem.
http://acm.timus.ru/problem.aspx?space=123&num=9&contest=true
I cann't not understand what the author really wants us to do?How to convert it into a pratical problem.
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