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我觉得不是这个问题吧，将最后结果记为double，再转换成long就没问题，组合数必定是整数啊

Posted by sparkling at 2007-07-10 23:26:36 on Problem 3252
In Reply To:double 有效位好象是15,16吧,如果大了,肯定就有误差了的. Posted by:nwpu_ghost at 2007-07-10 18:23:27 
> 建议做一下PKU上求组合数的题目
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