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晕,原来用prim这题过不去...

Posted by a024014 at 2007-08-26 21:24:35 on Problem 3357
In Reply To:Re:who can tell me where I am wrong???help!! thx!! Posted by:a024014 at 2007-08-25 16:45:22 
不妨,假设A有两条边,A->D,A->E,他们的权值一样， 则会先选择A->D,然后又选择D-X
假设权值为20,然而有可能,E->B有边而且权值也等于20,这样就出错了.因为B->E明显优于D->X这条边
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