#include <iostream>
#include <vector>
using namespace std;

int main(){
	vector<pair<int,int>> vp;
	int n,count = 0;
	cin >> n;
	int a[n];
	for(int i = 0;i < n;i++) cin >> a[i];
	for(int i = 0;i < n;i++){
		for(int j = i + 1;j < n;j++){
			if(a[i] > a[j]){
				count++;
				swap(a[i],a[j]);
				vp.push_back(make_pair(i,j));
			}
		}
	}
	cout << vp.size() << endl;
	for(auto p:vp) cout << p.first << ' ' << p.second << endl;
	cin >> n;
}