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不懂

Posted by chenweifeng at 2006-05-05 18:11:29 on Problem 2249
In Reply To:直接用组合公式就一步 Posted by:gemenhao at 2006-04-01 19:41:00
> __int64 cnk(__int64 n, __int64 k)
> {
> 	return k ? cnk(n-1,k-1)*n/k:1;
> }

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