#include <bits/stdc++.h>
  
using namespace std;
  
#define rep(i,n) REP(i,0,n)
#define REP(i,s,e) for(int i=(s); i<(int)(e); i++)
#define repr(i, n) REPR(i, n, 0)
#define REPR(i, s, e) for(int i=(int)(s-1); i>=(int)(e); i--)
#define pb push_back
#define all(r) r.begin(),r.end()
#define rall(r) r.rbegin(),r.rend()
#define fi first
#define se second
  
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
 
const int INF = 1e9;
const ll MOD = 1e9 + 7;
double EPS = 1e-8;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    int N;
    cin >> N;
    vector<int> v(N);
    rep(i, N) cin >> v[i];
    vector<int> a;
    rep(i, N) rep(j, N-1) if(v[j] > v[j+1]) {
        // cout << j << " " << j+1 << '\n';
        a.pb(j);
        swap(v[j], v[j+1]);
    }
    cout << a.size() << '\n';
    rep(i, a.size()) cout << a[i] << " " << a[i]+1 << '\n';
    cout << flush;
    int d;
    cin >> d;
    return 0;
}