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纪念第一个2-sat，虽然速度慢了点

Posted by zfy0701 at 2008-09-02 02:25:04 on Problem 3683 
顺便膜拜下第一楼的
1 3994688 plt 228K 47MS C++ 1789B 2008-08-31 15:22:57 
这是什么bt算法啊
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