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嗯,官方的测试数据弱了

Posted by asdf_1234 at 2011-01-05 20:45:32 on Problem 1356
In Reply To:这道题的onlinejudge有bug Posted by:coast at 2007-08-20 17:33:24
建议加数据,比如下面这组:
1
4 2
1 2
2 1
2 3
3 2

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