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

sortA = sorted(A)
ANS = []
for i in range(n):
    sa = sortA[i]
    if A[i] == sa:
        continue
    for j in range(i + 1, n):
        if A[j] == sa:
            for k in range(j, i, -1):
                ANS.append((k - 1, k))
                A[k - 1], A[k] = A[k], A[k - 1]
            break
print(len(ANS))
for u, v in ANS:
    print(u, v)
input()