n = int(input())
tab = []                            #contient les depassements
l = input().split()
for i in range(len(l)):
    l[i] = int(l[i])

s = 0                               #somme des croisements
k = 1


for i in range(1, n+1):
    if i != l[i-1]:
        a = l.index(i)
        while a > i-1:
            f = "{} {}".format(l[a-1], l[a])
            tab.append(f)
            l[a-1], l[a] = l[a], l[a-1]         #changement de positions
            s = s + 1
            a = a - 1
print(s)
for i in range(len(tab)):
    print(tab[i])