#include<bits/stdc++.h>
using namespace std;
using Int = long long;
//INSERT ABOVE HERE
signed main(){
  Int n;
  cin>>n;
  vector<Int> a(n);
  for(Int i=0;i<n;i++) cin>>a[i];
  using P = pair<Int, Int>;
  vector<P> ans;
  for(Int i=0;i<n;i++){
    for(Int j=0;j<n;j++){
      if(a[i]>a[j]){
	swap(a[i],a[j]);
	ans.emplace_back(i,j);
      }
    }
  }
  cout<<ans.size()<<endl;
  for(auto p:ans) cout<<p.first<<" "<<p.second<<endl;
  Int d;
  cin>>d;
  return 0;
}