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果然判断一边就行了，快了好多……

Posted by TN at 2005-07-26 11:53:01 on Problem 1981
In Reply To:判断了两点中垂线的两个方向,怪不得超时,只判一个方向就OK了~ Posted by:sothink at 2005-07-26 11:47:03 
可是为什么呢？
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