need main.cpp file.

Implement the quickselect algorithm on arrays. You write one function int quickselect (int *A, int k, int n); which returns the k-th smallest entry of an array A of length n. The programming language is C or C++; test your code before submission using the gcc or g++ compiler Please remove all dead code; try to program as clearly as possible, since I try to read it. Your function for this should be less than fifty lines of code long. You can use the quicksort code that I distributed, but do not copy code from another student or from the web; this is an easy project