#include<bits/stdc++.h> #include<time.h> using namespace std; using ll = long long; #define rep(i,n) for(ll i=0;i<ll(n);i++) #define all(A) A.begin(),A.end() using vll = vector<ll>; using vvll = vector<vll>; using vvvll = vector<vvll>; using vvvvll = vector<vvvll>; using vb = vector<bool>; using vvb = vector<vb>; using vvvb = vector<vvb>; using vvvvb = vector<vvvb>; bool DEB = 0; bool isbool(ll N){ if(N<=1)return 0; for(ll i=2;i*i<=N;i++){ if(N%i==0)return 0; } return 1; } ll modPow(ll a,ll n,ll mod){ a%=mod; if(n==0)return 1; if(n%2==1)return (modPow(a,n-1,mod)*a)%mod; ll res=modPow(a,n/2,mod); return (res*res)%mod; } int main() { ll N; cin>>N; vll A(N); rep(i,N)cin>>A[i]; vll L,R; rep(i,N)rep(j,N)rep(k,j)if(A[j]<A[k]){ L.push_back(j); R.push_back(k); swap(A[j],A[k]); } ll M=L.size(); cout<<M<<endl; rep(i,M)cout<<L[i]<<" "<<R[i]<<endl; cin>>N; }