#yuki_397
import sys

n=int(raw_input())
a=map(int,raw_input().split())
cnt=0
l=[]
for i in xrange(n):
 for j in xrange(n-i-1):
  if a[j]>a[j+1]:
   a[j],a[j+1]=a[j+1],a[j]
   cnt+=1
   l+=[[j,j+1]]
print cnt
for x,y in l:
 print x,y
sys.stdout.flush()