public static void main ( String [ ] args ) {
  FastReader in = new FastReader ( ) ;
  PrintWriter o = new PrintWriter ( System . out ) ;
  int n = in . nextInt ( ) ;
  int m = in . nextInt ( ) ;
  int k = in . nextInt ( ) ;
  int [ ] [ ] arr = new int [ n ] [ m ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) for ( int j = 0 ;
  j < m ;
  j ++ ) arr [ i ] [ j ] = in . nextInt ( ) ;
  if ( k == 0 ) {
    long total = ( m * ( m - 1 ) ) / 2 ;
    o . println ( total ) ;
    for ( int i = 0 ;
    i < m ;
    i ++ ) {
      for ( int j = i + 1 ;
      j < m ;
      j ++ ) {
        o . println ( ( i + 1 ) + " " + ( j + 1 ) ) ;
      }
    }
  }
  else {
    long total = ( m * ( m - 1 ) ) / 2 ;
    o . println ( total ) ;
    for ( int i = m - 1 ;
    i >= 0 ;
    i -- ) {
      for ( int j = i - 1 ;
      j >= 0 ;
      j -- ) {
        o . println ( ( i + 1 ) + " " + ( j + 1 ) ) ;
      }
    }
  }
  o . close ( ) ;
  o . flush ( ) ;
  return ;
}

public static void main ( String [ ] args ) { FastReader in = new FastReader ( ) ; PrintWriter o = new PrintWriter ( System . out ) ; int n = in . nextInt ( ) ; int m = in . nextInt ( ) ; int k = in . nextInt ( ) ; int [ ] [ ] arr = new int [ n ] [ m ] ; for ( int i = 0 ; i < n ; i ++ ) for ( int j = 0 ; j < m ; j ++ ) arr [ i ] [ j ] = in . nextInt ( ) ; if ( k == 0 ) { long total = ( m * ( m - 1 ) ) / 2 ; o . println ( total ) ; for ( int i = 0 ; i < m ; i ++ ) { for ( int j = i + 1 ; j < m ; j ++ ) { o . println ( ( i + 1 ) + " ▁ " + ( j + 1 ) ) ; } } } else { long total = ( m * ( m - 1 ) ) / 2 ; o . println ( total ) ; for ( int i = m - 1 ; i >= 0 ; i -- ) { for ( int j = i - 1 ; j >= 0 ; j -- ) { o . println ( ( i + 1 ) + " ▁ " + ( j + 1 ) ) ; } } } o . close ( ) ; o . flush ( ) ; return ; }
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(block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))))) right: (decimal_integer_literal)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (decimal_integer_literal)))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: 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