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我想问一下大家!!!

Posted by 810974380 at 2009-07-24 14:51:55 on Problem 1083 

测试数据:
10
2 3
4 5
6 7
8 9
10 11
12 13
14 15
16 17
18 19
20 21
       得到的结果到底是10 还是20 ? ? ?
       想来想去也想不通, 为什么会是20! ! !
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