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Re:直接套公式就过了......

Posted by xhpku at 2018-01-31 05:47:06 on Problem 2663
In Reply To:直接套公式就过了...... Posted by:LJW at 2009-06-08 08:03:37 
> 公式 f[i]:=f[i-2]*4-f[i-4] (i>2) 
>      边界值:f[0]:=1 f[2]:=3
> 
> PS:本人PKU一百题纪念。
关键是怎么解释？
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