说明：  设计一个类Sample,它有两个私有成员A[]和n(A中元素个数)，将对A[]中数据进行各种排序的函数放入到一个友元类process中。
(Sample Design of a kind, it has two private members [] A and n (A number of elements), A. [] will be the data for various sort of function Add Friends yuan to a process which category.)