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注意

Posted by huyuncongh at 2011-02-19 11:50:09 on Problem 2987
要用邻接表,当心空间超
数组要开大(悲剧的是,我开的太小 poj告诉我超时,我开的大一点poj给wa,非要足够大)
bi| ≤ 10^7 连正无穷的边可能要用int64
最大流ans和正权和应用int64

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