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

int main(int argc, char **argv )
 {
  int i,myid, numprocs;
  char sig[80];
  char *signatures;
  char **sigs;
  MPI_Status status;
  MPI_Init(&argc, &argv);
  MPI_Comm_size(MPI_COMM_WORLD, &numprocs);
  MPI_Comm_rank(MPI_COMM_WORLD, &myid); 
  sprintf(sig,"Hello from id %d\n",myid);
  if (myid == 0)
   signatures = (char *) malloc(numprocs * sizeof(sig));
  MPI_Gather(&sig,sizeof(sig),MPI_CHAR,signatures,sizeof(sig),MPI_CHAR,0,MPI_COMM_WORLD);
  if (myid == 0) 
   {
    sigs=(char **) malloc(numprocs * sizeof(char *));
    for(i=0;i<numprocs;i++) 
     {
      sigs[i]=&signatures[i*sizeof(sig)];
      printf("%s",sigs[i]);
     }
   }
  MPI_Finalize();
  return 0;
 }