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请教一个关于此题的问题

Posted by ip96cns at 2011-05-01 18:21:54 on Problem 3268
为何我 对每个点 分别求到达x的最短距离和x到达该点的最短距离 就会WAWAWA

然而用矩阵转置求两次x到其他点的最短距离就AC了....

这俩方法有什么区别么...除了第一种方法时间效率低之外....

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