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http://poj.org/problem?id=1112和这个题有一些像。

Posted by yygy at 2014-07-10 19:56:45 on Problem 1291
In Reply To:类似于2SAT的思想,这儿是无向图,可以直接用并查集来搞,利用对偶关系,贪心即可。1A Posted by:yygy at 2014-07-10 19:55:33


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