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ac now!!!

Posted by hua0629 at 2005-10-07 19:39:18 on Problem 2640
In Reply To:why wa? Posted by:hua0629 at 2005-10-07 18:58:17
我靠,想到怎么做后,10分钟不到就能搞定。
问题出在不能只是考虑三角形。

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