N = int(input())
A = list(map(int, input().split()))
ans = []
for _ in range(N - 1):
    for i in range(N - 1):
        if A[i] > A[i + 1]:
            A[i], A[i + 1] = A[i + 1], A[i]
            ans.append((i, i + 1))
print(len(ans), flush=True)
for a in ans:
    print(*a, flush=True)

D = int(input())