N = int(input())
A = list(map(int,input().split()))
A1 = sorted(A)
ans = []
while A!=A1:
    for i in range(N-1):
        if A[i]>A[i+1]:
            A[i],A[i+1] = A[i+1],A[i]
            ans.append((i,i+1))
print(len(ans))
for x,y in ans:
    print(x,y)
input()