package main

import (
	"fmt"
	"sort"
)

func bubble() {
	ans := make([]int, 0, 10000)
	var n int
	fmt.Scan(&n)
	a := make([]int, n)
	for i := 0; i < n; i++ {
		fmt.Scan(&a[i])
	}
	for i := 0; i < n; i++ {
		for j := 1; j < n-i; j++ {
			//fmt.Println(i, j)
			if a[j] < a[j-1] {
				sort.IntSlice(a).Swap(j, j-1)
				ans = append(ans, j)
				ans = append(ans, j-1)
			}
		}
	}
	fmt.Println(len(ans) / 2)
	for i := 0; i < len(ans)/2; i++ {
		fmt.Println(ans[i*2], ans[i*2+1])
	}
	var dummy string
	fmt.Scan(&dummy)
}

func main() {
	bubble()
	//rand.Seed(32423)
	//var n int
	//fmt.Scan(&n)
	//a := make([]int, n)
	//for i := 0; i < n; i++ {
	//	fmt.Scan(&a[i])
	//}
	//ans := make([]int, 0, 10000)
	//for !allNotKadomatsu(a) {
	//	b := rand.Int()%(n)
	//	c := rand.Int()%(n)
	//	for b==c{
	//		b = rand.Int()%(n)
	//		c = rand.Int()%(n)
	//	}
	//	sort.IntSlice(a).Swap(b, c)
	//	ans = append(ans, b)
	//	ans = append(ans, c)
	//}
	//fmt.Println(len(ans)/2)
	//for i := 0; i < len(ans) / 2; i++ {
	//	fmt.Println(ans[i*2], ans[i*2+1])
	//}
	//var dummy string
	//fmt.Scan(&dummy)
}

func allNotKadomatsu(a []int) bool {
	l := len(a)
	for i := 0; i < l-2; i++ {
		if isKadomatsu(a[i], a[i+1], a[i+2]) {
			return false
		}
	}
	return true
}

func isKadomatsu(a, b, c int) bool {
	if (b > a && b > c) || (b < a && b < c) {
		return true
	}
	return false
}