#include <bits/stdc++.h>
#define rep(i, a, n) for(int i = a; i < n; i++)
#define repp(i, n) rep(i, 0, n)
#define repb(i, a, b) for(int i = a; i >= b; i--)
#define all(a) a.begin(), a.end()
#define int long long
using namespace std;
typedef pair<int, int> P;

signed main(){
    int n, dm;
    cin >> n;
    vector<int> a(n);
    rep(i, 0, n) cin >> a[i];

    vector<int> ans;

    rep(i, 0, n - 1){
        repb(j, n - 1, i + 1){
            if(a[j] < a[j - 1]){
                ans. push_back(j);
                ans. push_back(j - 1);
                swap(a[j], a[j - 1]);
            }
        }
    }

    cout << ans.size() / 2 << endl;
    rep(i, 0, ans.size() / 2){
        cout << ans[2 * i] << ' ' << ans[2 * i + 1] << endl;
    }
    cout.flush();
    cin >> dm;
}