#include<bits/stdc++.h> using namespace std; #define FOR(i,a,b) for (int i=(a);i<(b);i++) #define RFOR(i,a,b) for (int i=(b)-1;i>=(a);i--) #define REP(i,n) for (int i=0;i<(n);i++) #define RREP(i,n) for (int i=(n)-1;i>=0;i--) vector<int>v1; vector<int>v2; vector<int>ans; vector<int>ans2; int main(){ int N; cin>>N; REP(i,N){ int a; cin>>a; v1.push_back(a); v2.push_back(a); } sort(v2.begin(),v2.end()); REP(i,N){ if(v1[i]==v2[i]) continue; for(int j=i+1;j<N;j++){ if(v1[j]==v2[i]){ int temp=v1[i]; v1[i]=v1[j]; v1[j]=temp; ans.push_back(i); ans2.push_back(j); } } } cout<<ans.size()<<endl; REP(i,ans.size()){ cout<<ans[i]<<" "<<ans2[i]<<endl; } int A; cin>>A; return(0); }