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Re:n！计算的一些优化In Reply To:Re:n！计算的一些优化 Posted by:butterfly at 2006-06-29 16:57:47 vc6.0居然不支持 unsigend __int64 -> double 转换，比较恼火， 在我的AMD3200 64位机器上用__int64比用32位计算快，毕竟少了 3/4的乘法运算量，其实最快方法是 质因数分解，然后计算累计计算，300ms 可计算出123456！ 去下载一个http://www.freewebs.com/maths/ 测试一下就知道有多块！ Followed by:
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