#include <bits/stdc++.h>
using namespace std;

int main() {
    int N;
    cin >> N;
    vector<int> v(N);
    for (auto& i : v) cin >> i;
    auto org = v;

    sort(v.begin(), v.end());

    int count = 0;
    vector<int> a;
    vector<int> b;

    for (int i = 0; i < N; i++) {
        if (org[i] != v[i]) {
            for (int j = i + 1; j < N; j++) {
                if (org[j] == v[i]) {
                    org[j] = org[i];
                    org[i] = v[i];
                    count++;
                    a.push_back(i);
                    b.push_back(j);
                }
            }
        }
    }

    cout << count << endl;

    for (int i = 0; i < count; i++) {
        cout << a[i] << " " << b[i] << endl;
    }

    return 0;
}