#!/usr/bin/env python3
import sys
n = int(input())
a = list(map(int,input().split()))
ans = []
for i in range(n):
    for j in reversed(range(i)):
        if a[j] > a[j+1]:
            ans.append((j, j+1))
            a[j], a[j+1] = a[j+1], a[j]
print(len(ans))
for i, j in ans:
    print(i, j)
sys.stdout.flush()
dummy = input()