#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <cctype>
#include <cmath>
#include <iostream>
#include <queue>
#include <list>
#include <stack>
#include <map>
#include <numeric>
#include <set>
#include <sstream>
#include <string>
#include <vector>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;

int main(){
  ios::sync_with_stdio(false);
  int N;
  cin >> N;
  vector<int> v;
  rep(i,N){
    int a;
    cin >> a;
    v.push_back(a);
  }

  vector< pair<int,int> > ret;
  rep(i,N-1){
    for(int j=N-1; j>i; j--){
      if(v[j] < v[j-1]){
        swap(v[j], v[j-1]);
        ret.push_back(make_pair(j-1,j));
      }
    }
  }
  cout << ret.size() << endl;
  rep(i,ret.size()){
    cout << ret[i].first << " " << ret[i].second << endl;
  }
  cin >> N;
  
  return 0;
}