static void findPermutation ( int n ) {
  Vector < Integer > res = new Vector < Integer > ( ) ;
  int en = 2 , on = 1 ;
  if ( n % 2 == 0 ) {
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      if ( i % 2 == 0 ) {
        res . add ( en ) ;
        en += 2 ;
      }
      else {
        res . add ( on ) ;
        on += 2 ;
      }
    }
  }
  else {
    for ( int i = 0 ;
    i < n - 2 ;
    i ++ ) {
      if ( i % 2 == 0 ) {
        res . add ( en ) ;
        en += 2 ;
      }
      else {
        res . add ( on ) ;
        on += 2 ;
      }
    }
    res . add ( n ) ;
    res . add ( n - 2 ) ;
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    System . out . print ( res . get ( i ) + " " ) ;
  }
  System . out . println ( "" ) ;
}

static void findPermutation ( int n ) { Vector < Integer > res = new Vector < Integer > ( ) ; int en = 2 , on = 1 ; if ( n % 2 == 0 ) { for ( int i = 0 ; i < n ; i ++ ) { if ( i % 2 == 0 ) { res . add ( en ) ; en += 2 ; } else { res . add ( on ) ; on += 2 ; } } } else { for ( int i = 0 ; i < n - 2 ; i ++ ) { if ( i % 2 == 0 ) { res . add ( en ) ; en += 2 ; } else { res . add ( on ) ; on += 2 ; } } res . add ( n ) ; res . add ( n - 2 ) ; } for ( int i = 0 ; i < n ; i ++ ) { System . out . print ( res . get ( i ) + " ▁ " ) ; } System . out . println ( " " ) ; }
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