#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  int n;
  cin >> n;
  vector<int> a(n);
  rep(i, n) cin >> a[i];
  vector<pair<int, int>> ans;
  rep(i, n) {
    int minim = i;
    for (int j = i; j < n; ++j) {
      if (a[j] < a[minim]) minim = j;
    }
    if (i != minim) {
      swap(a[i], a[minim]);
      ans.push_back({ i, minim });
    }
  }
  assert(is_sorted(a.begin(), a.end()));
  cout << ans.size() << endl;
  for (auto [x, y] : ans) {
    cout << x << ' ' << y << endl;
  }
  int dummy;
  cin >> dummy;
  return 0;
}