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如果存在对称中心的话，是否一定是偶数个点？

Posted by sothink at 2005-08-03 19:15:10 on Problem 2526
In Reply To:2526……疑惑…… Posted by:fjnu_jxd_001 at 2005-08-03 18:54:44 
> 对于这样的例子
> 3
> 3 1
> 0 -5
> 6 -5
> 应该输出yes还是no
> 
> 我输出no，我的朋友输出yes，但是我们的程序都AC了，寒……
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