#include <bits/stdc++.h>
using namespace std;
int a, xd, arraa[160026], arrxd[160026], arr321[160026], hasakihasaki[405],b;
int main(){
freopen("sorting.in", "r", stdin);
freopen("sorting.out", "w", stdout);

cin >> a;
for (int i = 1; i <=a; i++)
    cin >> hasakihasaki[i];

    for (int i = 1; i <= a; i++) {
        for (int j=1; j<=a-i; j++){
            if (hasakihasaki[j] > hasakihasaki[j+1]){
                b = hasakihasaki[j];
                hasakihasaki[j]=hasakihasaki[j+1];
                hasakihasaki[j+1]=b;
                xd++;
                arr321[xd] = j;
                arrxd[xd] = j+1;
            }

        }
    }
cout << xd << endl;
for (int i = 1; i <=xd; i++) {
    cout << arr321[i] << " " << arrxd[i] << endl;
}
return 0;
}