n = int(input())
a = list(map(int, input().split()))

ans = []
for i in range(n):
    for j in range(n - i - 1):
        if a[j] > a[j+1]:
            ans.append([j, j+1])
            a[j], a[j+1] = a[j+1], a[i]
   

print(len(ans))
for i, j in ans:
    print(i, j)

dummy = int(input())