using namespace std;
#include<iostream>
#include<fstream>
#include<queue>
int N;
struct nod{
 int eu,l,r,lg,s;};
nod v[2000010];
int q[2000010];
int R;

ofstream fout("huffman.out");

int min(int &s1,int &s2)
{
    if(q[s1]<q[s2] && s1<=N)
    {
        s1++;
        return s1-1;
    }
    else
    {
        s2++;
        return s2-1;
    }
}

nod unite(int i1,int i2,int k)
{
    q[k]=q[i1]+q[i2];
    nod a;
    //cout<<q[k]<<" "<<k<<" "<<i1<<" "<<i2<<"\n";
    a.eu=k;
    a.l=i1;
    a.r=i2;
    return a;
}

void create()
{
    int k=N;
    int s1=1,s2=k+1;
    int ans=0;
    q[s2]=0x3f3f3f3f;
    while(s1<=N || s2<k)
    {
        k++;
        v[k]=unite(min(s1,s2),min(s1,s2),k);//vezi ordinea

        ans+=q[k];

    }
    R=k;
    fout<<ans<<"\n";
}
void cit()
{
    ifstream fin("huffman.in");

    fin>>N;

    int i;
    for(i=1;i<=N;i++)
    {
       fin>>q[i];
    }
    fin.close();

}

void dfs(int x,int sum,int lev)
{
    if(v[x].l==0)
    {
        v[x].lg=lev;
        v[x].s=sum;
        return;
    }
    else
    {
        dfs(v[x].l,sum*2+0,lev+1);
        dfs(v[x].r,sum*2+1,lev+1);
    }
}

int main()
{
    cit();
    create();
    dfs(R,0,0);
    for(int i=1;i<=N;i++)
    {
        fout<<v[i].lg<<" "<<v[i].s<<"\n";
    }
    fout.close();
    return 0;
}