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确实存在通项公式,这一点也不nb

Posted by tzkq at 2010-07-13 07:05:35 on Problem 3086 and last updated at 2010-07-13 07:07:35
In Reply To:纯数学解法... Posted by:jmf at 2010-01-24 18:52:14
w(n)=n*(n+1)*(n+2)*(n+3)/8


用long long, 别忘咯

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