#include <bits/stdc++.h>
using namespace std;
typedef pair<int,int> pii;
typedef long long ll;
#define ITR(i,c) for(auto i=begin(c);i!=end(c);i++)
#define FORE(x,arr) for(auto &x:arr)
#define FOR(i,a,n) for(int i=a;i<(int)(n);i++)
#define REP(i,n) FOR(i,0,n)
#define ALL(c) begin(c),end(c)
const int DX[4]={0,1,0,-1}, DY[4]={-1,0,1,0};
const int INF = 1e9;

int main(int argc, char const *argv[]) {
    int N;
    cin >> N;
    vector<int> A(N);
    REP(i,N) cin >> A[i];

    vector<pii> ans;
    REP(j,N){
        FOR(i,1,N) {
            if(A[i-1]>A[i]) {
                ans.push_back(pii(i-1,i));
                swap(A[i-1],A[i]);
            }
        }
    }

    cout << ans.size() << endl;
    FORE(p,ans) cout << p.first << " " << p.second << endl;

    int dummy;
    cin >> dummy;
    return 0;
}