#define _USE_MATH_DEFINES
#include <algorithm>
#include <bitset>
#include <cstdio>
#include <functional>
#include <iostream>
#include <cfloat>
#include <climits>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <time.h>
#include <vector>
#include <random>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> i_i;
typedef pair<ll, int> ll_i;
typedef pair<double, int> d_i;
typedef pair<ll, ll> ll_ll;
typedef pair<double, double> d_d;
struct edge { int u, v; ll w; };
typedef vector<vector<bool> > grid;

ll INF = LLONG_MAX / 3;
ll MOD = 1000000007;
ll _MOD = 1000000009;
double EPS = 1e-10;

int main() {
	int N; cin >> N;
	vector<int> A(N);
	for (int& x: A) cin >> x;
	vector<int> ans;
	for (;;) {
		int i;
		for (i = 0; i < N - 1; i++)
			if (A[i] > A[i + 1]) {
				swap(A[i], A[i + 1]);
				ans.push_back(i);
				break;
			}
		if (i == N - 1) break;
	}
	int M = ans.size();
	cout << M << endl;
	for (int j = 0; j < M; j++)
		cout << ans[j] << ' ' << ans[j] + 1 << endl;
	int unko; cin >> unko;
}