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(); var a = sr.Next(N); var res = new List>(); for(var i = 1; i < N; i++){ for(var j = i; j < N; 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}")); //--------------------------------- } } public class StreamReader{ private readonly char[] _c = {' '}; private int _index = -1; private string[] _input = new string[0]; public T Next(){ 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(int x){ var ret = new T[x]; for(var i = 0; i < x; ++i) ret[i] = Next(); return ret; } } }