n = input()
a = list(map(int,input().split()))
li = []
for i in range(len(a) - 1):
    for j in range(i + 1,len(a)):
        if a[i] > a[j]:
            li.append(str(i) + " " +str(j))
            w = a[i]
            a[i] = a[j]
            a[j] = w
print(len(li))
for i in li:
    print(i)
input()