import sys
readline = sys.stdin.buffer.readline

import numpy as np

N = int(readline())
A = np.fromstring(readline(), np.int64, sep=' ')

answer = []

def swap_sort(A,ind):
    if ind == 1:
        return
    n = A[:ind].argmax()
    if n == ind-1:
        swap_sort(A,ind-1)
        return
    answer.append((n,ind-1))
    A[n], A[ind-1] = A[ind-1], A[n]
    swap_sort(A,ind-1)

swap_sort(A,N)

print(len(answer))
for i,j in answer:
    print(i,j)