#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <utility>
#include <string>

using namespace std;

void show(vector<int> &v) {
	for (auto e : v) {
		cout << e << " ";
	}
	cout << endl;
}

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

	vector<int> u, v;
// show(a);
	for (int i = 0; i < n; i++) {
		int mini_idx = i;
		for (int j = i; j < n; j++) {
			if (a[j] < a[mini_idx]) {
				mini_idx = j;
			}
		}
		if (mini_idx != i) {
			u.emplace_back(i);
			v.emplace_back(mini_idx);
			swap(a[i], a[mini_idx]);
// show(a);
		}
	}

	cout << u.size() << endl;
	for (int i = 0; i < u.size(); i++) {
		cout << u[i] << " " << v[i] << endl;
	}

	cin >> dummy;
	return 0;
}