#include <bits/stdc++.h>
#define REP(i,n) for(int i = 0; i < (int)(n); ++i)
using namespace std;

int main(){
    int N;
    cin >> N;
    vector<int> A;
    int t;
    REP(i,N){
        cin >> t;
        A.push_back(t);
    }

    int i = 0;
    int c = 0;
    vector<pair<int,int> > ans;
    while(i<N-1){
        if(A[i]>A[i+1]){
            ans.push_back(make_pair(i,i+1));
            t = A[i];
            A[i] = A[i+1];
            A[i+1] = t;
            i = 0;
            c++;
        }else{
            i++;
        }
    }
    cout << c << endl;
    for(pair<int,int> p : ans){
        cout << p.first << " " << p.second << endl;
    }
    int D;
    cin >> D;
    return 0;
}