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2组测试数据

Posted by zeming89 at 2010-07-13 19:29:32 on Problem 3687 
2

5 4
5 1
4 2
1 3
2 3

10 5
4 1
8 1
7 8
4 1
2 8
ans:
2 4 5 3 1        逆向建图
5 1 6 2 7 8 3 4 9 10  没有判重边的话就输出 -1
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