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最后结果需要64位保存,但是不知道为什么需要64位保存,按照我的理解32位也ok

Posted by Cathy11 at 2011-05-23 15:16:08 on Problem 3928
结果上限为N*(N-1),这个结果不可能达到的;
N<2^15,
所以结果<2^30,这个结果int可以保存的,不过我使用int,wa了,64位ac了

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