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我写了个暴力算法对答案= =结果发现n=220,m=100000的时候。。。。。

Posted by Ghost_lzy at 2016-08-19 13:20:30 on Problem 3420
我交上去AC的代码答案是负的= =,n=220的方案数能是负的么,所以数据有点水

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