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给大家1组数据

Posted by lvhao945 at 2010-09-10 12:27:01 on Problem 1637 and last updated at 2010-09-10 12:27:45 
6 6
1 2 1
2 3 1
3 1 1
4 5 1
5 6 1
6 4 1
答案是 impossible，图不连通
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