Introduction - If you have any usage issues, please Google them yourself
implement the following array element exchange position function: void swap (int a [], int m, int n) This function can be put n elements of the array a before and after the m-th element exchange position, that is, before the exchange: a1, a2, ..., aM, aM+1, aM+2, ..., after aM+N exchange: aM+1, aM+2, ..., aM+N, a1, a2, ..., aM (requirements: In addition to the array a, shall not introduce other array.)