n = int(input())
*a, = map(int,input().split())
res = []
for i in range(n):
    for j in range(n-i-1):
        if a[j] > a[j+1]:
            res.append((j+1,j+2))
            a[j+1],a[j] = a[j],a[j+1]
print(len(res))
for x,y in res:
    print(x,y)
import sys
sys.stdout.flush()
input()