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汗。。DAG4875ms险过,有几个坑要注意

Posted by changmu at 2014-08-18 19:06:57 on Problem 3249
1、如果用DAG的话需要反向建图;
2、答案必定在出度为0的点中;
3、答案有正有负、并不是输出绝对值。

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