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Re: 这是数学公式.....

Posted by Obeis123 at 2008-08-03 14:34:27 on Problem 2000
In Reply To: 这是数学公式..... Posted by:i_love_c at 2007-02-21 11:04:01 
> a=n*(n-1)/2+1;
> 1                1$
> 2  3             2$
> 4  5  6          3$
> 7  8  9  10      4$
> 11 12 13 14 15   5$
> ...
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