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a[0]=1 啊 我在这

Posted by 273544537 at 2006-07-19 21:24:35 on Problem 2506
In Reply To:Re:我想知道这题怎么推的啊~~ Posted by:YUMEN19850720 at 2006-06-28 23:50:00
> A[1]=1,A[2]=3,A[n]=A[n-1]+2*A[n-2]
> 注意数目的范围

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