#include <bits/stdc++.h>
#pragma GCC optimize("Ofast,unroll-loops")
using namespace std;
template <typename Arg1>
void __f(const char* name, Arg1&& arg1) {
  cerr << name << " : " << arg1 << std::endl;
}
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args) {
  const char* comma = strchr(names + 1, ',');
  cerr.write(names, comma - names) << " : " << arg1 << " | ";
  __f(comma + 1, args...);
}
const long long MAXN = 1000005;
const long long SQRTN = 1003;
const long long LOGN = 22;
const double PI = acos(-1);
const long long INF = 1e16;
const long long MOD = 1000000007;
const long long FMOD = 998244353;
const double eps = 1e-9;
mt19937 RNG(chrono::steady_clock::now().time_since_epoch().count());
template <typename T>
T gcd(T a, T b) {
  return (b ? __gcd(a, b) : a);
}
template <typename T>
T lcm(T a, T b) {
  return (a * (b / gcd(a, b)));
}
long long add(long long a, long long b, long long c = MOD) {
  long long res = a + b;
  return (res >= c ? res - c : res);
}
long long mod_neg(long long a, long long b, long long c = MOD) {
  long long res;
  if (abs(a - b) < c)
    res = a - b;
  else
    res = (a - b) % c;
  return (res < 0 ? res + c : res);
}
long long mul(long long a, long long b, long long c = MOD) {
  long long res = (long long)a * b;
  return (res >= c ? res % c : res);
}
long long muln(long long a, long long b, long long c = MOD) {
  long long res = (long long)a * b;
  return ((res % c) + c) % c;
}
long long mulmod(long long a, long long b, long long m = MOD) {
  long long q = (long long)(((long double)a * (long double)b) / (long double)m);
  long long r = a * b - q * m;
  if (r > m) r %= m;
  if (r < 0) r += m;
  return r;
}
template <typename T>
T expo(T e, T n) {
  T x = 1, p = e;
  while (n) {
    if (n & 1) x = x * p;
    p = p * p;
    n >>= 1;
  }
  return x;
}
template <typename T>
T power(T e, T n, T m = MOD) {
  T x = 1, p = e;
  while (n) {
    if (n & 1) x = mul(x, p, m);
    p = mul(p, p, m);
    n >>= 1;
  }
  return x;
}
template <typename T>
T extended_euclid(T a, T b, T& x, T& y) {
  T xx = 0, yy = 1;
  y = 0;
  x = 1;
  while (b) {
    T q = a / b, t = b;
    b = a % b;
    a = t;
    t = xx;
    xx = x - q * xx;
    x = t;
    t = yy;
    yy = y - q * yy;
    y = t;
  }
  return a;
}
template <typename T>
T mod_inverse(T a, T n = MOD) {
  T x, y, z = 0;
  T d = extended_euclid(a, n, x, y);
  return (d > 1 ? -1 : mod_neg(x, z, n));
}
const long long FACSZ = 1;
long long fact[FACSZ], ifact[FACSZ];
void precom(long long c = MOD) {
  fact[0] = 1;
  for (long long i = 1; i < FACSZ; i++) fact[i] = mul(fact[i - 1], i, c);
  ifact[FACSZ - 1] = mod_inverse(fact[FACSZ - 1], c);
  for (long long i = FACSZ - 1 - 1; i >= 0; i--) {
    ifact[i] = mul(i + 1, ifact[i + 1], c);
  }
}
long long ncr(long long n, long long r, long long c = MOD) {
  return mul(mul(ifact[r], ifact[n - r], c), fact[n], c);
}
void solvethetestcase();
signed main() {
  cout << fixed << setprecision(10);
  long long t = 1;
  for (long long testcase = 1; testcase < t + 1; testcase++) {
    solvethetestcase();
  }
}
long long n;
long long a[1005];
vector<pair<long long, long long> > gg;
bool cmp(pair<long long, long long> x, pair<long long, long long> y) {
  if (x.first == y.first) {
    return a[x.second] > a[y.second];
  }
  return x.first < y.first;
}
void solvethetestcase() {
  scanf("%lld", &n);
  vector<pair<long long, long long> > v;
  for (long long i = 0; i < n; i++) {
    scanf("%lld", &a[i]);
    v.push_back({a[i], i});
  }
  sort(v.begin(), v.end());
  for (long long i = 0; i < n; i++) v[i].first = i;
  for (auto x : v) a[x.second] = x.first;
  for (long long i = 0; i < n; i++) {
    for (long long j = i + 1; j < n; j++) {
      if (a[j] < a[i]) gg.push_back({i, j});
    }
  }
  sort(gg.begin(), gg.end(), cmp);
  printf("%lld\n", 1LL * gg.size());
  for (auto x : gg) {
    printf("%lld %lld\n", x.first + 1, x.second + 1);
  }
}
