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为什么double就可以过？

Posted by shixinfei at 2010-08-11 20:51:17 on Problem 2109 
double的范围是很广的，但是精度也就是16位有效数。p的数位是201位的，就不怕读取p的时候丢失太多精度，然后导致结果出错？
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