#include <stdio.h>
#include <stdlib.h>
#include <mpi.h>

const int tag = 10;

int main(int argc, char **argv)
{
  int pid, nprocs;
  MPI_Init(&argc, &argv);
  MPI_Comm_rank(MPI_COMM_WORLD, &pid);
  MPI_Comm_size(MPI_COMM_WORLD, &nprocs);

  int n = atoi(argv[1]); // taille du tableau total
  int a = pid;
   int Tab[8],i;
   char *msg="bonjour";


   int n_local= 8/nprocs;
   
  

  int tab_recu[n_local];
  

  if (pid == 0)
  {
  for (i=0;i<8;i++)
	  Tab[i] = i;
   for (i=0;i<8;i++) printf("tab[%d]=%d\n", i,Tab[i]);
  }
  // MPI_Barrier(MPI_COMM_WORLD);
   MPI_Scatter(Tab,n_local,MPI_INT,tab_recu,n_local,MPI_INT,0,MPI_COMM_WORLD);
  
   printf("tableau reçu de processus %d\t",pid);
    for ( i=0; i<n_local; i++) 
      printf("%d\t", tab_recu[i]);
      printf("\n");
   
      int s_local=0, s;
      for ( i=0; i<n_local; i++) s_local=s_local+tab_recu[i];
      //printf("%d\t", tab_recu[i]);
  
 
  MPI_Reduce(&s_local, &s, 1, MPI_INT,MPI_SUM, 0, MPI_COMM_WORLD);

    if (pid == 0)   printf("la somme =%d", s);

	
 
  MPI_Finalize();
  return 0;
}
/* if (pid==root)
    for (int i=0; i<nprocs; i++)
      if (i!=root)
	MPI_Ssend(tab+i*n_local,n_local,MPI_INT,i,tag,MPI_COMM_WORLD);
      else
	for (int j=0; j<n_local; j++)
	  tab_recu[j] = tab[n_local*root+j];
  else
    MPI_Recv(tab_recu,n_local,MPI_INT,root,tag,MPI_COMM_WORLD,MPI_STATUS_IGNORE);
  
  cout << "tab_recu de " << pid << " : ";
  for (int i=0; i<n_local; i++)
    cout << tab_recu[i] << " ";
  cout << endl;
*/