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为什么很多程序把弧的起始，终点弄反了都还能AC？

Posted by 10070709 at 2009-04-19 21:39:37 on Problem 1364 
x-y<=k
应该是w(y,x)=k吧；
但建图时有人写成w(x,y)=k
我倒
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