N=int(input())
M=list(map(int,input().split()))
A=[]
B=[]
for i in range(N):
    for j in range(N-1):
        if M[j]>M[j+1]:
            A.append(j)
            B.append(j+1)
            M[j],M[j+1]=M[j+1],M[j]
print(len(A))
for i in range(len(A)):
    print(A[i],B[i],' ')
N=input()