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在基本的2-SAT基础上，增加了诸如“a必须为1”的条件。若a必须为1，则连边a0 --> a1，这样只要一选a0，自然就矛盾了。

Posted by ImLazy at 2008-09-26 12:05:23 on Problem 3678
In Reply To:Xa AND Xb = 1, Xa OR Xb = 0这种情况怎么处理? Posted by:majia1234 at 2008-08-05 19:46:52 



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