I would like to ask why is that giving me seg fault.

  int **a = (int**) malloc (sizeof(int*) * 3);
  a[0][1] = 1;
  a[0][1] = 2;
  a[0][2] = 3;

  for(int i = 0; i < 3; i++)
  {
      printf("%d", a[0][i]);
      //but works with for instance: a[0][1]
  }

I would like to ask why is that giving me seg fault.

  int **a = (int**) malloc (sizeof(int*) * 3);
  a[0][0] = 1;
  a[0][1] = 2;
  a[0][2] = 3;

  for(int i = 0; i < 3; i++)
  {
      printf("%d", a[0][i]);
      //but works with for instance: a[0][1]
  }