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原来真正的prim是O（N^2)，以前写的都是O(N^3),幸好这次超时，让我发出了自己的错误！

Posted by lync at 2009-05-09 22:41:37 on Problem 1751 
提交之后超时，经人提醒，发现自己写的prim是prim是O(N^3)，这此之前已经做了4个
最小生成树的题了，一真没有发现这个问题，修改代码变成O(N^2)，AC
这次超时值了！
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