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是4吧

Posted by Grope at 2004-08-15 13:55:09 on Problem 1769
In Reply To:请教这组数据的答案,是3吧 Posted by:songxy at 2004-08-15 09:19:36 
> 40 5
> 1 10
> 9 20
> 19 30
> 7 31
> 29 40
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