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

ANS=[]
for i in range(N):
    MIN=min(A[i:])

    if MIN==A[i]:
        continue
    else:
        for j in range(i,N):
            if A[j]==MIN:
                ANS.append((i,j))
                A[i],A[j]=A[j],A[i]
                break

print(len(ANS),flush=True)
for x,y in ANS:
    print(x,y,flush=True)
D=input()