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北京大学《ACM/ICPC大学生程序设计竞赛训练》暑期课面向全球招生!

请教大牛们一组数据

Posted by SolarShining at 2009-09-05 22:12:06 on Problem 3189
6 6
2 3 4 5 6 1
3 6 4 5 1 2
2 6 4 5 1 3
3 6 2 5 1 4
1 3 4 2 6 5
2 3 4 5 1 6
2 2 2 2 2 2

这组数据的标程输出为1,可是我怎么也想不明白为什么是1.

谢谢指教。

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