回复：2*4!可以理解，5!仍不太明白。anyway, thank you!

来源: jinjing 于 2010-04-17 05:43:11 [] [旧帖] [给我悄悄话] 阅读数 : (161 bytes)
回答: 回复：details? please! 由 jinjing 于 2010-04-16 16:00:53

We get a circle first and put 123456 on it.6 has to been connected 1 and/or 5 .If 5 between 1 and 5 OK,if out,as there four sections,two are OK two not OK.So,...

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