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

target = sorted(a, reverse=True)
current = a.copy()
swaps = []

for i in range(n):
    # Find the index j >= i where current[j] == target[i]
    j = i
    while j < n and current[j] != target[i]:
        j += 1
    if j != i:
        swaps.append((i, j))
        current[i], current[j] = current[j], current[i]

print(len(swaps))
for u, v in swaps:
    print(u, v)