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不用重复计算,想想上海初赛的A

Posted by Sempr at 2006-11-18 13:05:52 on Problem 3090
In Reply To:计算下三角 Posted by:Morpheus at 2006-11-18 12:48:46
> (x - y) = 1,(x - y) = -1,x = 1,y = 1然后只计算下三角.还有什么更优吗?

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