#include <bits/stdc++.h>

using namespace std;

int main()
{
    int n;
    cin>>n;
    vector<int> a(n);
    int eleje=0, vege=0,uj;
    for(int i=0;i<n;i++)
    {
        cin>>a.at(i);
        if(a.at(i)<a.at(0))
        {
            vege=i;
        }
    }
    int tav=vege;
    cout<<vege<<endl;
    for(int i=1;i<n-tav;i++)
    {
        for(int j=i+tav+1;j<n;j++)
        {
            cout<<"lepes:"<<i<<" "<<j<<endl;

            if(a.at(j)<a.at(i))
            {
                eleje=i;
                vege=j;
                tav=j-i;
                cout<<eleje<<" "<<vege<<endl;
            }
        }
    }

    cout << eleje+1<<" "<<vege+1 << endl;
    return 0;
}