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想不到邻接矩阵和临界表的效率差距这么大

Posted by ACM06021fly at 2006-09-16 00:21:14 on Problem 2838 
    开始一看时间和内存给的好慷慨，想都没想就用邻接矩阵做了，结果超时，改为邻接表，才700多ms。
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