#include "bits/stdc++.h"
using namespace std;
#define ll long long int
#define rep(i,n) for( int i = 0; i < n; i++ )
#define rrep(i,n) for( int i = n; i >= 0; i-- )
#define REP(i,s,t) for( int i = s; i <= t; i++ )
#define RREP(i,s,t) for( int i = s; i >= t; i-- )
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define INF 2000000000
#define mod 1000000007
#define INF2 1000000000000000000


int main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
	int N; cin >> N;
	int A[N];
	rep(i, N) cin >> A[i];
	vector<int> v1;
	rep(i, N) {
		REP(j, 0, N - 2 - i) {
			if (A[j] > A[j + 1]) {
				v1.push_back(j);
				swap(A[j], A[j + 1]);
			}
		}
	}
	cout << v1.size() << endl;
	rep(i, v1.size()) {
		cout << v1[i] << " " << v1[i] + 1 << endl;
	}
	//rep(i, N) cout << A[i] << " ";
	cout << flush;
	cin >> N;

    return 0;
}