Timus | 1280. Topological Sorting

	Problem Name:	1280. Topological Sorting
	Site:	Timus
	Links:	Problem Editorials
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	Problem setters:	© Sergey G. Volchenkov, 2003([email protected]); Vladimir N. Pinaev, 2003([email protected]; http://www.pic200x.chat.ru); Michael Y. Kopachev, 2003 ([email protected]).