import sequtils,strutils,algorithm,math,sugar,macros,strformat
proc getchar_unlocked():char {. importc:"getchar_unlocked",header: "<stdio.h>" .}
proc scan(): int =
  while true:
    var k = getchar_unlocked()
    if k < '0': break
    result = 10 * result + k.ord - '0'.ord
let n = scan()
let A = newSeqWith(n,scan())
let B = A.sorted(cmp)
var C = A
var results = newSeq[(int,int)]()
for i in 0..<n:
  if C[i] == B[i]: continue
  for j in i+1..<n:
    if C[j] != B[i]: continue
    swap(C[i],C[j])
    results &= (i,j)
echo results.len()
for rs in results: echo rs[0]," ",rs[1]
discard stdin.readLine()