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虽然题目没有这种数据，不过假设所有数字都相等，结果就是c(n,3)，这是上界

Posted by yzhw at 2011-11-11 04:02:10 on Problem 3928
In Reply To: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 
> 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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