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不是很理解这题的建图

Posted by D1000306 at 2010-11-02 17:10:54 on Problem 3678 
(1) A and B = 0 添加弧 A->!B , B->!A
(2)A and B = 1 !A->A , !B->B
(3)A or B = 0 A->!A , B->!B
(4)A or B = 1 !A->B , !B->A
(5)A xor B = 0 A->B , B->A , !A->!B ,!B->!A
(6)A xor B = 1 A->!B, B->!A,!B->A,!A->B
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