import java.util.Arrays;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Scanner;
import java.util.Set;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		final int N = sc.nextInt();
		int[] arr = new int[N];
		for(int i = 0; i < N; i++){
			arr[i] = sc.nextInt();
		}
		
		LinkedList<String> answers = new LinkedList<String>();
		for(int i = 0; i < N - 1; i++){
			for(int j = N - 1; j > i; j--){
				if(arr[j] > arr[j - 1]){
					int tmp = arr[j];
					arr[j] = arr[j - 1];
					arr[j - 1] = tmp;
					answers.add((j) + " " + (j - 1));
				}
			}
		}
		
		System.out.println(answers.size());
		for(final String str : answers){
			System.out.println(str);
		}
		System.out.flush();
		
		sc.next();
	}

}