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注意这个条件吧,任意u,v,d(u)+d(v)>=n...而且...不是叫"容斥"吧?

Posted by ArXoR at 2005-06-29 22:29:46 on Problem 2438
In Reply To:但是我没有北大的离散教程,学离散时用的英文版,提到了这个算法,讲了构造法,但是我中文都不太理解。。 Posted by:sunmoonstar_love at 2005-06-29 22:23:34
> 用容斥原理易证有ai(1<i<k)使a1与ak相连且ai+1与a1相连,
> 
> 这一点,怎么证的?
> 
> 
> 
> 

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