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很显然可以O(n),假如有对称中心,(x=max(x)+min(x))/2,同理y,然后检查每个点是否有对称点。

Posted by bupt at 2005-08-16 12:44:07 on Problem 2526
In Reply To:???只能想到 nlogn了 Posted by:sunmoonstar_love at 2005-08-08 19:50:03


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