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

class Program
{
    public void Proc()
    {
        Reader.IsDebug = false;
        int matsuCount = int.Parse(Reader.ReadLine());
        int[] inpt = Reader.ReadLine().Split(' ').Select(a=>int.Parse(a)).ToArray();
        matsuCount = inpt.Length;

        inpt.ToList().ForEach(a=>this.Matsu.Add(this.Matsu.Count, a));

        StringBuilder ans = new StringBuilder();
        int conv = 0;
        for(int i=0; i<matsuCount; i++) {
            int min = this.Matsu.Where(a=>a.Key >= i).OrderBy(a=>a.Value).First().Key;
            if(i != min) {
                conv++;
                ans.AppendLine(i + " " + min);
                int tmp = this.Matsu[i];
                this.Matsu[i] = this.Matsu[min];
                this.Matsu[min] = tmp;
            }
        }
        Console.WriteLine(conv);
        Console.Write(ans.ToString());
        string dummy = Reader.ReadLine();
    }

    private Dictionary<int, int> Matsu = new Dictionary<int,int>();
    private Dictionary<int, int> Goal = new Dictionary<int, int>();

    public class Reader
    {
        public static bool IsDebug = true;
        private static String PlainInput = @"



6
1 2 3 4 5 6 7 8 9 10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10 9 8 7 6 5 4 3 2 11 2 3 4 5 6 7 8 9 10 9 8 7 6 5 4 3 2 11 2 3 4 5 6 7 8 9 10 9 8 7 6 5 4 3 2 11 2 3 4 5 6 7 8 9 10 9 8 7 6 5 4 3 2 11 2 3 4 5 6 7 8 9 10 9 8 7 6 5 4 3 2 11 2 3 4 5 6 7 8 9 10 9 8 7 6 5 4 3 2 1
-1

 
";
        private static System.IO.StringReader Sr = null;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (Sr == null)
                {
                    Sr = new System.IO.StringReader(PlainInput.Trim());
                }
                return Sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }

    }
    static void Main()
    {
        Program prg = new Program();
        prg.Proc();
    }
}