using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace yuki0715_D
{
    class Program
    {
        
     
        static void Main(string[] args)
        {
            var sb = new StringBuilder();
            int n = getint();
            var x = getsplit();
            var a = Array.ConvertAll(x, int.Parse);
            bool s = true;
            int count = 0;
            while (s)
            {
                s = false;
                for (int j = n - 1; j > 0; j--)
                {
                    if (a[j] < a[j - 1])
                    {
                        int k = a[j - 1];
                        a[j - 1] = a[j];
                        a[j] = k;
                        sb.AppendLine(j-1 + " "+j);
                        count++;
                        s = true;
                    }
                }
            }
            Console.WriteLine(count);
            Console.Write(sb);
            n = getint();
        }
       
        public static string[] getsplit()
        {
            string[] x = Console.ReadLine().Split(' ');
            return x;
        }
        public static int getint()
        {
            int x = int.Parse(Console.ReadLine());
            return x;
        }
    }
}