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Re:求此题解法。。。。In Reply To:Re:求此题解法。。。。 Posted by:qsort at 2010-05-09 17:27:13 > ans(n,k)=1(k==0) > else = > (k!)(k+1)^(n-k)-((k-1)!)(k)^(n-k+1) Followed by: Post your reply here: |
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