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注意 当不连通时，输出为-1的情况。

Posted by ldc_hust at 2008-04-28 12:57:09 on Problem 2377 and last updated at 2008-04-28 13:00:10 
注意：  当不连通时，输出为-1的情况以及重边（例：1 3 7 . 1  3 8  则1 3的代价为8）
我就是没考虑这WA了两次！！！
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