package main

import (
	"fmt"
	"math/rand"
	"sort"
)

func main() {
	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
}