/*
 /+==================================================+\
//+--------------------------------------------------+\\
|.|\\...>>>>>>> Hollwo_Pelw(ass) 's code <<<<<<<...//|.|
\\+--------------------------------------------------+//
 \+==================================================+/
*/
#include <bits/stdc++.h>
using namespace std;
// type
typedef long long ll;
typedef long double ld;
// pair
#define F                   first
#define S                   second
#define pii                 pair<int, int>
#define pll                 pair<ll, ll>
#define pdd                 pair<ld, ld>
// vector & !!?(string)
#define eb                  emplace_back
#define pb                  push_back
#define all(a)              a.begin(), a.end()
#define rall(a)             a.rbegin(), a.rend()
#define sz(a)               a.size()
#define len(a)              a.length()
// I/O
#define open(file, in, out) if (fopen(file in, "r")) {        \
                                freopen(file in, "r", stdin);  \
                                freopen(file out, "w", stdout); \
                            }
#define FAST_IO             std::ios::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define setpre(n)           fixed << setprecision(n)
bool endline = false;
template<class T>
istream& operator >> (istream& inp, vector<T>& v){
    for (auto& it : v) inp >> it;
    return inp;
}
template<class T>
ostream& operator << (ostream& out, vector<T>& v){
    for (auto& it : v) out << it << (endline ? "\n" : " ");
    return out;
}
template<class T, class U>
istream& operator >> (istream& inp, pair<T, U>& v){
    inp >> v.F >> v.S;
    return inp;
}
template<class T, class U>
ostream& operator << (ostream& out, pair<T, U>& v){
    out << v.F << ' ' << v.S;
    return out;
}
#define debug(x)            cout << #x << " : " << endl << x << endl;
#define Ptest(x)            return cout << x << endl, (void) 0;
// geometry calculate
#define pi                  acos(-1.0)
#define g_sin(a)            sin(a*pi/180)
#define g_cos(a)            cos(a*pi/180)
#define g_tan(a)            tan(a*pi/180)
// set val
#define ms0(a)              memset(a,        0, sizeof(a));
#define ms1(a)              memset(a,        1, sizeof(a));
#define msn1(a)             memset(a,       -1, sizeof(a));
#define msinf(a)            memset(a, 0x3f3f3f, sizeof(a));
// constant
const int mod1 = 998244353, mod = 1e9 + 7;
const int MAXN = 1e5 + 5 , MAXM = 3e5 + 5;
const int inf = 2e9; const ll linf = 1e18;
// code
#define left node << 1, tl, tm
#define right node << 1 | 1, tm + 1, tr
#define int long long

int val[MAXN];
vector<pii> ed;
int a[505][505], n, mr;

void build(vector<int> leaf, int p){
    // cout << r << " HHAH " << leaf << endl;
    if (leaf.size() == 1){
        if (p != -1){
            ed.eb(leaf.back(), p);
        }else{
            mr = leaf.back();
        }
        val[leaf.back()] = a[leaf.back()][leaf.back()];
        return ;
    }
    int r =  ++n;
    if (p != -1){
        ed.eb(r, p);
    }else{
        mr = r;
    }
    for (auto u : leaf){
        for (auto v : leaf){
            val[r] = max(val[r], a[u][v]);
        }
    }
    vector<bool> mark(leaf.size(), 0);
    for (int i = 0; i < leaf.size(); i++){
        if (mark[i]) continue;
        vector<int> newleaf(1, leaf[i]);
        mark[i] = 1;
        for (int j = i + 1; j < leaf.size(); j++){
            if (a[leaf[i]][leaf[j]] < val[r]){
                newleaf.pb(leaf[j]);
                mark[j] = 1;
            }
        }
        build(newleaf, r);
    }
}

void Solve() {
    cin >> n;
    vector<int> l;
    for (int i = 1; i <= n; i++){
        l.pb(i);
        for (int j = 1; j <= n; j++){
            cin >> a[i][j];
        }
    }
    build(l, -1);
    cout << n << endl;
    for (int i = 1; i <= n; i++){
        cout << val[i] << ' ';
    }
    cout << endl << mr << endl;
    for (auto [u, v] : ed){
        cout << u << ' ' << v << endl;
    }
}

signed main(){
    open("", ".inp", ".out");
    FAST_IO; int TC = 1;
    // cin >> TC;
    while(TC--) Solve();
    return 0;
}
/*

\/-=====>>><<<-------- DEBUG -------->>><<<=====-\/
/\.............................................../\
+====================== INP ======================+


+====================== OUT ======================+


+======================*****======================+
\/...............................................\/
/\-=====>>><<<--------= END =-------->>><<<=====-/\

*/
