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

int main() {
	int n;
	cin >> n;

	vector<int> a(n);
	for (int i = 0; i < n; i++) {
		cin >> a[i];
	}

	vector<pair<int, int>> ans;
	for (int i = 0; i < n; i++) {
		for (int j = i + 1; j < n; j++) {
			if (a[i] > a[j]) {
				ans.emplace_back(i, j);
				swap(a[i], a[j]);
			}
		}
	}

	cout << ans.size() << endl;
	for (auto p : ans) {
		cout << p.first << " " << p.second << endl;
	}

	int dummy;
	cin >> dummy;
}