#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream> 
#include<map>
#include <stdlib.h>
#include <list>
#include <typeinfo>
#include <list>
#include <set>
#include <iomanip>
using namespace std;
#define MAX_MOD 1000000007
#define REP(i,n) for(int i = 0;i < n;++i)
int hoge_now[1000] = {};
int main() {
	int n;
	cin >> n;
	vector<int> a;
	REP(i, n) {
		int hoge;
		cin >> hoge;
		a.push_back(hoge);
		hoge_now[i] = hoge;
	}
	sort(a.begin(), a.end());
	int ans = 0;
	vector<pair<int, int>> rep;
	for (int i = 0;i < n;++i) {
		for (int q = i;q < n;++q) {
			if (a[i] == hoge_now[q]) {
				if (i != q) {
					ans++;
					rep.push_back(make_pair(i, q));
					swap(hoge_now[i], hoge_now[q]);
				}
				goto next;
			}
		}
	next:;
	}
	cout << ans << endl;
	for (int i = 0;i < ans;++i) {
		cout << rep[i].first << " " << rep[i].second << endl;
	}
	int dummy;
	cin >> dummy;
	return 0;
}