N = int(input())
A = [int(i) for i in input().split()]
#s = [[int(j) for j in input().split()] for i in range(N)]

res = []
for i in range(N):
    mid = i
    for j in range(i+1,N):
        if A[j]<A[mid]:
            mid=j
    if mid!=i:
        res.append((mid,i))
        A[mid],A[i] = A[i],A[mid]
print(len(res))
for a,b in res:
    print(a,b,flush=True)
input()