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Re:求此题解法。。。。

Posted by qsort at 2010-05-09 17:27:13 on Problem 3761
In Reply To:Re:求此题解法。。。。 Posted by:qsort at 2010-05-09 17:26:11 
> 话说现场的时候刚看出规律比赛就结束了
ans(n,k)=1(k==0)
else =
(k!)(k+1)^(n-k)-((k-1)!)(k)^(n-k+1)
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