public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int [ ] arr = new int [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    arr [ i ] = sc . nextInt ( ) ;
  }
  ArrayList < Integer > list = new ArrayList < > ( ) ;
  int index = 0 ;
  int swaps = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int min = index ;
    for ( int j = index ;
    j < n ;
    j ++ ) {
      if ( arr [ j ] < arr [ min ] ) min = j ;
    }
    if ( min != index ) {
      list . add ( min ) ;
      list . add ( index ) ;
      swaps ++ ;
    }
    int temp = arr [ index ] ;
    arr [ index ] = arr [ min ] ;
    arr [ min ] = temp ;
    index ++ ;
  }
  System . out . println ( swaps ) ;
  for ( int i = 0 ;
  i < list . size ( ) ;
  i ++ ) {
    if ( i % 2 == 0 && i != 0 ) System . out . println ( ) ;
    System . out . print ( list . get ( i ) + " " ) ;
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int [ ] arr = new int [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { arr [ i ] = sc . nextInt ( ) ; } ArrayList < Integer > list = new ArrayList < > ( ) ; int index = 0 ; int swaps = 0 ; for ( int i = 0 ; i < n ; i ++ ) { int min = index ; for ( int j = index ; j < n ; j ++ ) { if ( arr [ j ] < arr [ min ] ) min = j ; } if ( min != index ) { list . add ( min ) ; list . add ( index ) ; swaps ++ ; } int temp = arr [ index ] ; arr [ index ] = arr [ min ] ; arr [ min ] = temp ; index ++ ; } System . out . println ( swaps ) ; for ( int i = 0 ; i < list . size ( ) ; i ++ ) { if ( i % 2 == 0 && i != 0 ) System . out . println ( ) ; System . out . print ( list . get ( i ) + " ▁ " ) ; } }
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