#include <bits/stdc++.h>

using namespace std;

int main() {

    int n; cin >> n;

    int a[n] = {};

    for (int i = 0; i < n; i++)

        cin >> a[i];

    int p[n] = {};

    iota(p, p + n, 0);

    sort(p, p + n, [&] (int x, int y) {

        if (a[x] != a[y]) return a[x] < a[y];

        else return x < y;

    });

    vector<pair<int, int>> res;

    for (int i = 0; i < n; i++) {

        for (int j = 0; j + 1 < n; j++) {

            if (p[j] > p[j + 1]) {

                res.emplace_back(p[j + 1], p[j]);

                swap(p[j], p[j + 1]);

            }

        }

    }

    cout << res.size() << "\n";

    for (auto i : res)

        cout << i.first + 1 << ' ' << i.second + 1 << "\n";

}