I've comeup with the following program to do it, but it does not seem to work and goes into infinite loop. Its working is similar to quicksort.

int main()
{
 int arr[] = {1,1,0,1,0,0,0,1,0,1,0,1,0,1,0,1,0,1};
 int N = 18;
 int *front, *last;

 front = arr;
 last = arr + N;
 while(front <= last)
 {
  while( (front < last) && (*front == 0) )
   front++;

  while( (front < last) && (*last == 1) )
   last--;

  if( front < last)
  {
   int temp = *front;
   *front = *last;
   *last = temp;
   front ++;
   last--;
  }
 }
 for(int i=0;i<N;i++)
  printf("%d ",arr[i]);

 return 0;
}