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大牛求解

Posted by Exky at 2011-08-16 07:38:26 on Problem 1466 and last updated at 2011-08-16 07:42:54 
3
0: (2) 1 2
1: (2) 0 2
2: (2) 0 1
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答案是 1
？？
但我的AC程序说是2.
还是说不许有环
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