k=input;k()
a=list(map(int,k().split()))
c=len(a)
l=[]
for i in range(c*c):
 i%=c-1
 if a[i]>a[i+1]:l+=[[i,i+1]];a[i],a[i+1]=a[i+1],a[i]
print(len(l))
for i,j in l:print(i,j)
k()