import java.util.*;

public class Main {
  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();
    }
    ArrayList<Integer> list1 = new ArrayList<Integer>();
    ArrayList<Integer> list2 = new ArrayList<Integer>();
    for(int i = 0; i < n; i++) {
      for(int j = i + 1; j < n; j++) {
        if(a[i] > a[j]) {
          list1.add(i);
          list2.add(j);
          int s = a[j];
          a[j] = a[i];
          a[i] = s;
        }
      }
    }
    System.out.println(list1.size());
    for(int i = 0; i < list1.size(); i++) {
      System.out.println(list1.get(i) + " " + list2.get(i));
    }
    int t = sc.nextInt();
    System.out.flush();
  }
}