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

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    int N; cin >> N;
    vector<int> A(N);
    rep(i,N) cin >> A[i];

    vector<pair<int,int>> ans;
    rep(i,N)rep(j,i) if(A[j] > A[i]) {
        ans.push_back({i, j});
        swap(A[i], A[j]);
    }

    cout << ans.size() << "\n";
    for(auto [u, v] : ans) cout << u << " " << v << "\n";
    cout.flush();

    int DUMMY; cin >> DUMMY;
}