import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class Main {
		static int INF = 2 << 27;
		public static void main(String[] args) {
			Scanner sc = new Scanner(System.in);
			int N = sc.nextInt();
			int[] A = new int[N];
			for(int i = 0; i < N; i++) {
				A[i] = sc.nextInt();
			}
			List<Integer> u = new ArrayList<>();
			List<Integer> v = new ArrayList<>();
			for(int i = 0; i < N; i++) {
				for(int j = i-1; j  >= 0; j--) {
					if(A[j] >= A[j+1]) {
						int tmp = A[j];
						A[j] = A[j+1];
						A[j+1] = tmp;
						u.add(j);
						v.add(j+1);
					}
				}
			}
			System.out.println(u.size());
			for(int i = 0; i < u.size(); i++) {
				System.out.println(u.get(i) + " " + v.get(i));
			}
			System.out.flush();
			sc.nextInt();
		}

		

}