#include <math.h>
#include "mpi.h"
#include <time.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>

int main(argc,argv)
    int argc;
    char *argv[];
{
        int i,myid, numprocs;
        int source,count;
        MPI_Status status;
        MPI_Request request;

        double start_time, end_time;
        MPI_Init(&argc,&argv);
        MPI_Comm_size(MPI_COMM_WORLD,&numprocs);
        MPI_Comm_rank(MPI_COMM_WORLD,&myid);
        source=0;

        if (argc < 2){
                printf("Specify data size");
                MPI_Finalize();
        }
        sscanf(argv[1], "%d", &count);
        double *buffer = (double *)malloc(sizeof(double) * count);
        if(myid == source){
                int i;
                srand(0xBEEF);
                for (i=0; i<count; i++){
                        buffer[i]=rand();
                }
                start_time = MPI_Wtime();
        }
        MPI_Barrier(MPI_COMM_WORLD);
        for(int j=0; j<myid; j++){
          int root=j;
          MPI_Bcast(buffer,count,MPI_INT,root,MPI_COMM_WORLD);
          for(int k=0; k<1000000; k++){
            ;
          }
          MPI_Barrier(MPI_COMM_WORLD);
        }

        if (myid == 0){
                end_time = MPI_Wtime();
                printf("Elapsed time: %.8f\n", end_time-start_time);
        }
        MPI_Finalize();
}