用数组存储一个大数的阶层。输入一个整数n,先求出n!占用的位数。动态开辟bits位数组，用适当方法把n!的值存储到数组里去-storage arrays with a majority of the class. The importation of an integer n, first obtained n! The median occupancy. The median opening bits dynamic group, the use of appropriate means, n! The value of the storage array happened