N=int(input())
A=list(map(int,input().split()))
ans_lst=[]
for j in range(N):
    for i in range(j):
        if A[i]>A[j]:
            A[i],A[j]=A[j],A[i]
            ans_lst.append((i,j))
print(len(ans_lst))
for i,j in ans_lst:
    print(i,j)