Write a complete MPI program that computes the sum 1 + 2 + … + p, where p is the number of processes. The program should

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Write a complete MPI program that computes the sum 1 + 2 + … + p, where p is the number of processes. The program should use MPI collective communication functions calls in the following way. Each process i assigns the value ( i + 1 ) to an integer, and then the processes perform a sum reduction of these values. Process 0 should print the result of the reduction. As a way to double-check the result, process 0 should also compute and print the value p(p + 1)/2.