#include <bits/stdc++.h>
using namespace std;

#define int long long

int N, A[100];

signed main()
{
	cin >> N;
	for (int i = 0; i < N; i++) cin >> A[i];

	vector<int> ans;
	
	for (int i = 0; i < N; i++)
	{
		for (int j = N - 1; j > i; j--)
		{
			if (A[j - 1] > A[j]) swap(A[j - 1], A[j]), ans.push_back(j);
		}
	}
	printf("%d\n", ans.size());
	for (int i = 0; i < ans.size(); i++) printf("%lld %lld\n", ans[i] - 1, ans[i]);
	cin >> N;
	fflush(stdout);
	return 0;
}