N = int(input())
A = list(map(int,input().split()))
ans = []
while A:
    x = A.index(max(A))
    while x + 1 < len(A):
        if A[x] != A[x+1]:
            A[x],A[x+1] = A[x+1],A[x]
            ans.append((x,x+1))
        x += 1
    A.pop()

print(len(ans))
for a in ans:
    print(*a)