n = gets.to_i
a = gets.split.map(&:to_i)


ans = []
n.times { |i|
  j = a.each_with_index.min[1]
  if i != j
    a[i], a[j] = a[j], a[i]
    ans << [i,j]
  end
}

puts ans.size
ans.each { |a,b|
  puts "#{a} #{b}"
}
$>.flush

gets