package contest;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.Scanner;

public class Q1233 {
	static Scanner in;
	static PrintWriter out;
	static String INPUT = "";
	
	static void solve()
	{
		int n = ni();
		int[] a = new int[n];
		for(int i = 0;i < n;i++){
			a[i] = ni();
		}
		int[][] ai = new int[n][];
		for(int i = 0;i < n;i++){
			ai[i] = new int[]{a[i], i};
		}
		Arrays.sort(ai, new Comparator<int[]>() {
			public int compare(int[] a, int[] b) {
				return a[0] - b[0];
			}
		});
		int[] ord = new int[n];
		for(int i = 0;i < n;i++){
			ord[ai[i][1]] = i;
		}
		
		List<String> list = new ArrayList<>();
		for(int i = 0;i < n;i++){
			if(ord[i] != i){
				for(int j = i;j < n;j++){
					if(ord[j] == i){
						list.add(i + " " + j);
						int d = ord[i]; ord[i] =  ord[j]; ord[j] = d;
						break;
					}
				}
			}
		}
		out.println(list.size());
		for(String line : list){
			out.println(line);
		}
		out.flush();
		ni();
	}
	
	public static void main(String[] args) throws Exception
	{
		in = INPUT.isEmpty() ? new Scanner(System.in) : new Scanner(INPUT);
		out = new PrintWriter(System.out);
		
		solve();
		out.flush();
	}
	
	static int ni() { return Integer.parseInt(in.next()); }
	static long nl() { return Long.parseLong(in.next()); }
	static double nd() { return Double.parseDouble(in.next()); }
	static void tr(Object... o) { if(INPUT.length() != 0)System.out.println(Arrays.deepToString(o)); }
}