#include<iostream>
#include<cstdio>
#include<algorithm>
#include<vector>
#include<map>
#include<set>
#include<cstring>
#include<cstdlib>
#include<string>
#include<numeric>
using namespace std;

#define int long long
#define rep(i,n) for(int i=0;i<(n);i++)
#define all(v) (v).begin(),(v).end()
#define pb push_back
typedef vector<int>vint;
typedef pair<int,int>pint;
typedef vector<pint>vpint;
template<typename A,typename B>inline void chmin(A &a,B b){if(a>b)a=b;}
template<typename A,typename B>inline void chmax(A &a,B b){if(a<b)a=b;}

bool f(int a,int b,int c){
    if(a==b||b==c||c==a)return false;
    if(a>b&&c>b)return true;
    if(a<b&&c<b)return true;
    return false;
}

signed main(){
    int N;
    int A[100];
    cin>>N;
    rep(i,N)cin>>A[i];
    vpint ans;
    rep(i,N-2){
        if(f(A[i],A[i+1],A[i+2])){
            ans.pb(pint(i+1,i+2));
            swap(A[i+1],A[i+2]);
        }
    }
    cout<<ans.size()<<endl;
    rep(i,ans.size())cout<<ans[i].first<<" "<<ans[i].second<<endl;
    int tmp;cin>>tmp;
    return 0;
}