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back to boardShow all messages Hide all messagestest ? Nguyễn Cảnh Toàn 4 Jan 2009 08:26 1 2
2 3
3 1
1 10
in this test , i do not know why ?
what about the others vertex ? 4,5,6,7,8,9 ?? "Imagine graph drawn on a wall. Select any vertex and erase exactly two edges incidental to this vertex. The question of problem is: "Is it possible to erase all edges of graph doing in this way?""
think again:
1 2
2 3
3 1
1 10
you will understand.... |
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