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直接套公式就过了......

Posted by LJW at 2009-06-08 08:03:37 on Problem 2663 and last updated at 2009-06-08 08:06:57 
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。
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