n = input()

A = map(eval, raw_input().strip().split())
assert len(A) == n

l = []
for i in xrange(len(A)):
  for j in xrange(1, len(A) - i):
    if A[j] < A[j-1]:
      A[j], A[j-1] = A[j-1], A[j]
      l += [(j, j-1)]

print len(l)
print "\n".join(map(lambda x: "%d %d" % x, l))
d = raw_input()