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

ans = []
for i in range(n):
  min_j = i
  for j in range(i, n):
    if a[j] < a[min_j]:
      min_j = j
  if i != min_j:
    a[i], a[min_j] = a[min_j], a[i]
    ans.append(f"{i} {min_j}")

print(len(ans))
print(*ans, sep="\n")