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套个无穷级数的公式，就是除以(1-p)，就可以了

Posted by Seen at 2011-12-20 18:35:10 on Problem 3028
In Reply To:O(2^n*n^4)算法tle，O(2^n*n^3)算法迭代30次tle，迭代20次3922ms卡着过了……>_<|| Posted by:xuhaoran_contest_ID at 2011-07-15 14:03:41 
> rt
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