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为什么是这样?????不懂

Posted by sdau_085111 at 2010-11-02 20:04:26 on Problem 1205
In Reply To:Re:思路 Posted by:bobobry at 2010-09-14 00:24:52
> a[i] = 3*a[i-1]-a[i-2]
> 这样比较好吧

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