#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)
#define FOR(i,b,e) for (int i=(int)(b); i<(int)(e); i++)
#define ALL(x) (x).begin(), (x).end()

const double PI = acos(-1);

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  int n;
  cin >> n;
  vector<int> a(n);
  REP (i, n) cin >> a[i];

  vector<pair<int, int> > ret;
  bool update = true;
  while (update) {
    update = false;
    REP (i, n-1) {
      if (a[i] > a[i+1]) {
        swap(a[i], a[i+1]);
        update = true;
        ret.emplace_back(i, i+1);
      }
    }
  }

  cout << ret.size() << endl;
  REP (i, ret.size())
    cout << ret[i].first << " " << ret[i].second << endl;

  cout.flush();
  int dummy;
  cin >> dummy;
  
  return 0;
}