N = int(input())
A = list(map(int, input().split()))
ans = []
for i in range(N):
    for j in range(N):
        if A[i] < A[j]:
            A[i], A[j] = A[j], A[i]
            ans.append((i, j))

print(len(ans))
for a, b in ans:
    print(a, b)

int(input())