n = int(input())
a = list(map(int, input().split()))

cnt = 0
ans = []
for i in range(n):
    minv = i
    for j in range(i+1, n):
        if a[j] < a[minv]:
            minv = j
            cnt += 1
            ans.append([i,j])
    a[i], a[minv] = a[minv], a[i]
   

print(cnt)
for i, j in ans:
    print(i, j)

dummy = int(input())