/**
* ACM Training 2009
* ACM Problem #280 - Vertex
* Link: http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=23&page=show_problem&problem=2113
*
* @author XXX
* @author YYY
* @version 1.0, 03/23/2009
*
* Methode: Graphen (DFS)
* Status : Accepted
* Runtime: 0.100
*/