static void odd_even ( int arr [ ] , int n ) {
  Vector < Integer > odd_indexes = new Vector < Integer > ( ) ;
  Vector < Integer > even_indexes = new Vector < Integer > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( i % 2 == 0 ) odd_indexes . add ( arr [ i ] ) ;
    else even_indexes . add ( arr [ i ] ) ;
  }
  Collections . sort ( odd_indexes ) ;
  Collections . sort ( even_indexes ) ;
  for ( int i = 0 ;
  i < odd_indexes . size ( ) ;
  i ++ ) System . out . print ( odd_indexes . get ( i ) + " " ) ;
  for ( int i = 0 ;
  i < even_indexes . size ( ) ;
  i ++ ) System . out . print ( even_indexes . get ( i ) + " " ) ;
}

static void odd_even ( int arr [ ] , int n ) { Vector < Integer > odd_indexes = new Vector < Integer > ( ) ; Vector < Integer > even_indexes = new Vector < Integer > ( ) ; for ( int i = 0 ; i < n ; i ++ ) { if ( i % 2 == 0 ) odd_indexes . add ( arr [ i ] ) ; else even_indexes . add ( arr [ i ] ) ; } Collections . sort ( odd_indexes ) ; Collections . sort ( even_indexes ) ; for ( int i = 0 ; i < odd_indexes . size ( ) ; i ++ ) System . out . print ( odd_indexes . get ( i ) + " ▁ " ) ; for ( int i = 0 ; i < even_indexes . size ( ) ; i ++ ) System . out . print ( even_indexes . get ( i ) + " ▁ " ) ; }
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