#include <iostream>
#include <vector>
#include <algorithm>
#include <string>

using namespace std;

typedef pair<int,int> PII;

void solve()
{
    int N;
    cin >> N;
    
    vector<int> input(N+1);
    
    for( int i=0; i<N; i++ )
    {
        cin >> input[i];
    }
    
    vector<PII> ans;
    
    for( int i=N-1; 0<i; i-- )
    {
        if( input[i] < input[i-1] )
        {
            swap( input[i-1], input[i] );
            ans.push_back( PII( i-1, i ) );
        }
    }
    
    cout << ans.size() << endl;
    for( auto itr = ans.begin(); itr != ans.end(); ++itr )
    {
        cout << itr->first+1 << " " << itr->second+1 << endl;
    }
    cout << flush;
    int dummy;
    cin >> dummy;
}

int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    solve();
    return 0;
}