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1273,Drainage Ditches,经典的网络流，我用这个题写了好多网络流的模版，没有一个在别的题wa的

Posted by palmtenor at 2005-05-07 14:19:21 on Problem 1459
In Reply To:Re:建议你去做Ditch,USACO的数据通常比较强..... Posted by:frkstyc at 2005-05-07 14:17:36 
> ditch是什么？
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