#!/usr/bin/python3
nya = lambda msg: print(msg, flush=True)

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

arr = []
for i in range(n):
    if a[i] == b[i]:
        continue
    for j in range(i+1, n):
        if a[j] == b[i]:
            arr.append((i, j))
            a[i], a[j] = a[j], a[i]
            break

m = len(arr)
nya(m)
for x, y in arr:
    nya('{} {}'.format(x, y))