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Re:请教这组数据的答案,是3吧

Posted by iyixiang at 2009-08-07 20:04:52 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
29 40
7 31

ans=3吧?
1 10
7 31
29 40

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