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当然能,枚举+贪心阿

Posted by 19870909 at 2009-09-20 19:34:29
In Reply To:直接加了个源点当根求最小树形图水过了。。。。听说有n^2的。。。。。 Posted by:DieIng at 2009-09-20 19:32:57


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