#include “mpi.h”
#include
// sum_val for process with rank 0 will be the sum of all my_val’s
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void my_prefix_sum(int local_n, int *sum_matrix)
// update sum_vals to be the prefix sum
int myrank, nprocs; // add any other variables you need
MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
MPI_Comm_rank(MPI_COMM_WORLD, &myrank);
int p = (int)round(std::sqrt(nprocs));
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