Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

const MAX = 1000
const NIL = -1

type Node struct {
	id    int
	depth int
}

type Queue struct {
	head      int
	tail      int
	container [MAX]Node
}

func (q *Queue) inQueue(x Node) {
	q.container[q.tail] = x
	q.tail = (q.tail + 1) % MAX
}

func (q *Queue) deQueue() Node {
	x := q.container[q.head]
	q.head = (q.head + 1) % MAX
	return x
}

func (q *Queue) isEmpty() bool {
	return q.head == q.tail
}

var sc = bufio.NewScanner(os.Stdin)

func scanInt() int {
	num, _ := strconv.Atoi(scanString())
	return num
}

func scanString() string {
	sc.Scan()
	return sc.Text()
}

func init() {
	sc.Split(bufio.ScanWords)
}

func main() {
	n := scanInt()
	route := make([][]int, n)
	for i := range route {
		u, k := scanInt(), scanInt()
		u--
		route[u] = make([]int, k)
		for j := range route[u] {
			num := scanInt()
			num--
			route[i][j] = num
		}
	}

	d := make([]int, n)
	for i := range d {
		d[i] = NIL
	}

	start := Node{0, 0}
	que := Queue{}
	que.inQueue(start)
	for !que.isEmpty() {
		node := que.deQueue()
		if d[node.id] != NIL {
			continue
		}
		d[node.id] = node.depth

		for _, nextId := range route[node.id] {
			next := Node{id: nextId, depth: node.depth + 1}
			que.inQueue(next)
		}
	}

	for i, depth := range d {
		fmt.Println(i+1, depth)
	}
}

C++: #include<iostream>
#include<queue>

using namespase std;
static const int N = 100;
static const int INFTY = (1<<21);

int n, M[N][N];
int d[N];

void bfs(int s) {
  queue<int> q;
  q.push(s);
  for (int i = 0; i < n; i++) d[i] = INFTY;
  d[s] = 0;
  int u;
  while ( !q.empty() ) {
    u = q.front(); q.pop();
    for ( int v = 0; v < n; v++) {
      if (M[u][v] == 0) continue;
      if (d[v] != INFTY) continue;
      d[v] = d[u] + 1;
      q.push(v);
    }
  }
  for (int i = 0; i < n; i++) {
    cout << i+1 << " " << ((d[i] == INFTY) ? (-1) : d[i] ) << endl;
  }
}

int main() {
  int u, k, v;

  cin >> n;
  for ( int i = 0; i < n; i++ ) {
    for (int j = 0; j < n; j++ ) M[i][j] = 0;
  }

  for (int i = 0; i < n; i++) {
    cin >> u >> k;
    u--;
    for (int j = 0; j < k; j++) {
      cin >> v;
      v--;
      M[u][v];
    }
  }

  bfs(0);

  return 0;
}

C++: #include <iostream>
#include <string>
#include <vector>
#include <queue>
#include <utility>
#include <limits.h>
using namespace std;
typedef vector<vector<int>> matrix;

void bfs(matrix G)
{
    int N = G.size() - 1;

    // node[i] = pair<is_visited, int depth>
    vector<pair<bool, int>> node(N + 1, make_pair(false, 0));
    queue<int> Q;

    // initial step
    Q.push(1);
    node[1] = make_pair(true, 0);

    // BFS
    while (!Q.empty())
    {
        int n = Q.front();
        Q.pop();

        int depth = node[n].second;

        for (int i = 1; i <= N; i++)
        {
            bool is_visited = node[i].first;
            bool can_visit = G[n][i];

            if (!is_visited && can_visit)
            {
                Q.push(i);
                node[i] = make_pair(true, depth + 1);
            }
        }
    }

    for (int i = 1; i <= N; i++)
    {
        if (node[i].first == false)
        {
            cout << i << " " << -1 << endl;
        }
        else
        {
            cout << i << " " << node[i].second << endl;
        }
    }
    return;
}

int main()
{
    // 入力
    int N;
    cin >> N;
    matrix G(N + 1, vector<int>(N + 1, 0));

    for (int i = 0; i < N; i++)
    {
        int u, k;
        cin >> u >> k;
        for (int j = 0; j < k; j++)
        {
            int v;
            cin >> v;
            G[u][v] = 1;
        }
    }

    bfs(G);
    return 0;
}

C++: #include<iostream>
#include<queue>

using namespeace std;
static const int N = 100;
static const int INFTY = (1<<21);

int n, M[N][N];
int d[N];

void dfs(int s)
{
  queue<int> q;
  q.push(s);
  for(int i = 0; i < n; i++)d[i] = INFTY;
  d[s] = 0;
  int u;
  while(!q.empty())
   {
     u =.front(); q.pop();
     for(int v = 0; v < n; v++)
      {
        if(M[u][v] == 0)continue;
        if(d[v] != INFTY)continue;
        d[v] = d[u] + 1;
        q.push(v);
      }
   }  
  for(int i = 0; i <n; i++)
    {
       cout << i+1 " " <<((d[i] == INFTY)?(-1):d[i])<<endl;
    } 
}

int main()
{
  int u, k, v;


  cin >> n;
  for(int i = 0; i < n; i++)
  {
      for(int j = 0; j < n; j++)M[i][j] = 0;
  }
  
  for(int i = 0; i < n; i++)
  {
    cin >> u >> k;
    u--;
    for(int j = 0; j < k; j++)
    {
      cin >> v;
      v--;
      M[u][v] = 1;
    }
  }

  bfs(0);

  return 0;
}

C++: #include <iostream>
#include <vector>
#include <queue>
#define int long long
#define WHITE 0
#define GRAY 1
#define BLACK 2
typedef long long ll;
using namespace std;

int N, k, d[100];
vector<int> E[100];

void bfs(int s){
    queue<int> Q;
    d[s] = 0;
    Q.push(s);
    while(!Q.empty()){
        int u = Q.front();
        Q.pop();
        for(int i=0;i<E[u].size();i++){
            if(d[E[u][i]] == -1){
                d[E[u][i]] = d[u]+1;
                Q.push(E[u][i]);
            }
        }
    }
}

signed main(){
    cin >> N;
    for(int i=0;i<N;i++){
        cin >> k >> k;
        for(int j=0;j<k;j++) {
            int node;
            cin >> node;
            node--;
            E[i].push_back(node);
        }
    }
    for(int i=0;i<N;i++) d[i] = -1;
    bfs(0);
    for(int i=0;i<N;i++) cout << i+1 << " " << d[i] << endl;
    return 0;
}

C++: #include <iostream>
#include <queue>
using namespace std;

int main(){

  bool adj[100][100];
  int d[100];
  int n,u,v,k;

  cin >> n;
  for (int i=0; i<n; i++){
    cin >> u >> k;
    for (int j=0; j<k; j++){
      cin >> v;
      adj[u-1][v-1] = true;
    }
  }
  
  queue<int> q;
  bool pushed[100];
  q.push(1);
  pushed[1-1] = true;
  d[0] = 0;

  while(q.empty() == false){
    u = q.front();
    q.pop();
    for (int i=0; i<n; i++){
      if (adj[u-1][i]){
	if (pushed[i] != true){
	  d[i] = d[u-1] + 1;
	  q.push(i+1);
	  pushed[i] = true;
	}
      }
    }
  }
  
  for (int i=0; i<n; i++){
    cout << i+1 << " " << d[i] << endl;
  }

}

C++: #include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <map>
#include <set>
#include <vector>
#include <stack>
#include <queue>
#include <bitset>
#include <algorithm>
#include <numeric>
#include <functional>
using namespace std;

#define Rep(b, e, i) for(int i = b; i <= e; i++)
#define Repr(e, b, i) for(int i = e; i >= b; i--)
#define rep(n, i) Rep(0, n-1, i)
#define repr(n, i) Repr(n-1, 0, i)
#define all(v) (v).begin(), (v).end()
#define pb(v) push_back(v)
#define uniq(v) (v).erase(unique(all(v)),(v).end())
#define bitcnt(x) __builtin_popcount(x)
#define fst first
#define snd second
#define Pqaz(T) priority_queue<T,vector<T>,greater<T>>
#define Pqza(T) priority_queue<T>
#define ENJYU std::ios::sync_with_stdio(false);std::cin.tie(0);

typedef long long ll;
typedef pair<ll, ll> llP;
typedef pair<int, int> intP;

//vector の中身を出力
template <class T>ostream &operator<<(ostream &o,const vector<T>&v)
{o<<"{";for(int i=0;i<(int)v.size();i++)o<<(i>0?", ":"")<<v[i];o<<"}";return o;}

const int MAX = 128;

vector <int> adj[MAX];
int d[MAX];

void solve(void){
	ENJYU;
	int N;
	cin >> N;
	rep(N, i) {
		int u, k;
		cin >> u >> k;
		u--;
		rep(k, i) {
			int v;
			cin >> v;
			v--;
			adj[u].pb(v);
		}
	}
	memset(d, -1, sizeof(d));
	queue <int> q;
	q.push(0);
	d[0] = 0;
	while (!q.empty()) {
		int n = q.front();
		q.pop();
		for (int nv : adj[n]) {
			if (d[nv] > 0) continue;
			d[nv] = d[n] + 1;
			q.push(nv);
		}
	}

	rep(N, i) cout << i+1 << ' ' << d[i] << endl;

}

int main(void){
	solve();
	//cout << "yui(*-v・)yui" << endl;
	return 0;
}