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

b = sorted(a)
c = 0
l = []
for i in range(n):
    while a[i] != b[i]:
        d = a[i:].index(b[i])
        l.append([i, i+d])
        a[i], a[i+d] = a[i+d], a[i]
        c += 1

print(c)
for i, j in l:
    print(i, j)