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

namespace No397{
    public class Program{
        public static void Main(string[] args){
            var sr = new StreamReader();
            //---------------------------------
            var N = sr.Next<int>();
            var a = sr.Next<int>(N);
            var res = new List<Tuple<int, int>>();

            for(var i = 0; i < N; i++){
                for(var j = 1; j < N - i; j++){
                    if(a[j - 1] > a[j]){
                        var tmp = a[j - 1];
                        a[j - 1] = a[j];
                        a[j] = tmp;
                        res.Add(Tuple.Create(j - 1, j));
                    }
                }
            }

            //Console.WriteLine(string.Join(" ", a));
            Console.WriteLine(res.Count);
            res.ForEach(tp => Console.WriteLine($"{tp.Item1} {tp.Item2}"));
            sr.Next<int>();
            //---------------------------------
        }
    }



    public class StreamReader{
        private readonly char[] _c = {' '};
        private int _index = -1;
        private string[] _input = new string[0];

        public T Next<T>(){
            if(_index == _input.Length - 1){
                _index = -1;
                while(true){
                    string rl = Console.ReadLine();
                    if(rl == null){
                        if(typeof(T).IsClass) return default(T);
                        return (T)typeof(T).GetField("MinValue").GetValue(null);
                    }
                    if(rl != ""){
                        _input = rl.Split(_c, StringSplitOptions.RemoveEmptyEntries);
                        break;
                    }
                }
            }
            return (T)Convert.ChangeType(_input[++_index], typeof(T), System.Globalization.CultureInfo.InvariantCulture);
        }

        public T[] Next<T>(int x){
            var ret = new T[x];
            for(var i = 0; i < x; ++i) ret[i] = Next<T>();
            return ret;
        }
    }
}