// Huffman cu heap, O(n log n)

#include <stdio.h>
#include <algorithm>
#include <vector>

using namespace std;

#define maxn 1000100
#define inf 1LL * 1000000000 * 1000000000
#define mp make_pair
#define ff first
#define ss second
#define pb push_back

struct nod
{
    long long v;
    long f[2];
} nod[2*maxn];

long n, i, j, k, p, a[maxn];
long long b[maxn], m, sol;
long lg[maxn];
vector<pair<long long, long> > v;
pair<long long, long> per;

void df(long poz, long long cod, long nivel)
{
    if(nod[poz].f[0])
    {
        df(nod[poz].f[0], cod*2, nivel+1);
        df(nod[poz].f[1], cod*2+1, nivel+1);
        return;
    }
    lg[poz]=nivel;
    b[poz]=cod;
    sol+=lg[poz]*nod[poz].v;
}

void solve()
{
    k=n;
    make_heap(v.begin(), v.end());
    while(v.size()>1)
    {
        ++k;
        p=0;
        m=inf;
        for(i=0; i<2; i++)
        {
            per=(*v.begin());
            pop_heap(v.begin(), v.end());
            v.pop_back();
            nod[k].f[i]=per.ss;
            nod[k].v+=(-per.ff);
        }
        v.pb(mp(-nod[k].v, k));
        push_heap(v.begin(), v.end());
       // sol+=nod[k].v;
    }
    df(k, 0, 0);
}             

int main()
{
    freopen("huffman.in", "r", stdin);
    freopen("huffman.out", "w", stdout);
    scanf("%d", &n);
    for(i=1; i<=n; i++)
    {
        scanf("%d", &nod[i].v);
        v.pb(mp(-(1LL * nod[i].v), i));
    }
    solve();
    printf("%lld\n", sol);
    for(i=1; i<=n; i++)
    {
        printf("%d %lld\n", lg[i], b[i]);
    }
    return 0;
}