#include <cstdio>
#include <cstdlib>
#include <cstddef>
#include <vector>
#include <algorithm>
#include <cmath>
#include <string>
#include <iostream>
#include <iomanip>
#include <numeric>
#define L64 long long
#define MOD (1000000007LL)

int main(void)
{
  int dmy;
  int n;
  std::cin >> n;
  std::vector<int> a(n);
  std::vector<int> src, dst;
  int cnt = 0;
  for (int i = 0; i < n; i++){
    std::cin >> a[i];
  }
  for (int i = 0; i < n - 1; i++){
    int minpos = i;
    for(int j = i + 1; j < n; j++){
      if(a[j] < a[minpos]){
        minpos = j;
      }
    }
    if(minpos != i){
      src.push_back(i);
      dst.push_back(minpos);
      cnt++;
      int tmp = a[minpos];
      a[minpos] = a[i];
      a[i] = tmp;
    }
  }
  std::cout << cnt << std::endl;
  for (int i = 0; i < cnt; i++){
    std::cout << src[i] << " " << dst[i] << std::endl;
  }

  std::cin >> dmy;
}