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

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

print(len(ans))
for i in ans:
    print(*i)

dummy = input()