#include "bits/stdc++.h"

using namespace std;

vector<pair<int, int>> solve(int n, vector<int>& a) {
	vector<pair<int, int>> res;
	bool flag = true;
	for (int i = 0; flag; i++) {
		flag = false;
		for (int j = n - 1; j >= i + 1; j--) {
			if (a[j] < a[j - 1]) {
				swap(a[j], a[j - 1]);
				res.push_back(make_pair(j - 1, j));
				flag = true;
			}
		}
	}

	return res;
}

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

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

	vector<pair<int, int>> res = solve(n, a);

	cout << res.size() << endl;
	for (auto p : res) {
		cout << p.first << " " << p.second << endl;
	}
	cout << flush;
	return 0;
}