N=int(input())
A=list(map(int,input().split()))

X=[]
for i in range(N):
    for j in range(i,N):
        if A[i]>A[j]:
            A[i],A[j]=A[j],A[i]
            X.append((i,j))

print(len(X))
for i,j in X:
    print(i,j)