import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {
	static List<Integer> list;
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int N = scan.nextInt();
		int[]A = new int[N];
		for(int i = 0; i < N; i++) {
			A[i] = scan.nextInt();
		}
		list = new ArrayList<Integer>();
		bubbleSort(A, N);
		System.out.println(list.size() / 2);
		for(int i = 0; i < list.size() / 2; i += 2) {
			System.out.print(list.get(i) + " " + list.get(i + 1));
		}

		int Dummy = scan.nextInt();
		scan.close();
		if(Dummy == -1) {
			System.exit(0);
		}
	}
	static void bubbleSort(int[]A, int n) {
		boolean flag = true;
		while(flag) {
			flag = false;
			for(int i = n - 1; i >= 1; i--) {
				if(A[i] < A[i - 1]) {
					int t = A[i];
					A[i] = A[i - 1];
					A[i - 1] = t;
					flag = true;
					list.add(i);
					list.add(i-1);
				}
			}
		}
	}
}