static int [ ] reverse ( int str [ ] , int start , int end ) {
  int temp ;
  while ( start <= end ) {
    temp = str [ start ] ;
    str [ start ] = str [ end ] ;
    str [ end ] = temp ;
    start ++ ;
    end -- ;
  }
  return str ;
}

static int [ ] reverse ( int str [ ] , int start , int end ) { int temp ; while ( start <= end ) { temp = str [ start ] ; str [ start ] = str [ end ] ; str [ end ] = temp ; start ++ ; end -- ; } return str ; }
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