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终于AC..记录边就行了

Posted by boycott at 2009-03-25 09:38:29 on Problem 1815
In Reply To:拆点+枚举+网络流(预流推进)还超时啊。。。？谁能帮帮。。 Posted by:boycott at 2009-03-18 13:54:52 
You can assume that the number of 1s will not exceed 5000 in the input.
1的个数不超过5000，用边保存图
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