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奇数的时候输出-1啊?

Posted by ACM30155 at 2005-10-15 17:11:41 on Problem 2663
In Reply To:Re:求救啊：谁能说一下奇数时候的情况，最好给两组例子，郁闷坏了。 Posted by:frkstyc at 2005-10-15 17:04:21 
> 1
> -1
> 
> 0
> 
> 3
> -1
> 
> 0
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