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是网络流，两点之间可能有多于一条水渠，要把流量相加

Posted by Alcyone at 2003-08-16 21:59:46 on Problem 1273
In Reply To:这题是网络流吗? Posted by:hong_liming at 2003-08-16 17:28:19 
我们contest的时候也狂wa。。 >_<
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