N = gets.to_i
A = gets.split.map(&:to_i)

updated = true
ans = []

while updated
  updated = false

  (N - 1).times do |i|
    next if A[i] <= A[i + 1]

    A[i], A[i + 1] = A[i + 1], A[i]
    ans << [i, i + 1]
    updated = true
    break
  end
end

puts ans.size
puts ans.map { |u, v| "#{u} #{v}" }
gets