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

def solve(N, As):
    ans = []
    for i in range(N):
        for j in range(N-1, i, -1):
            if As[j] < As[j-1]:
                As[j], As[j-1] = As[j-1], As[j]
                ans.append((j, j-1))
    return ans

ans = solve(N, As)
print(len(ans))
for u, v in ans:
    print(u, v)

dummy = input()