Go: package main

/*
グラフの表現 隣接行列による表現
*/

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

func main() {
	scanner := makeScanner(8192)
	n := eGetInt(scanner)
	g := make([][]int, n+1)
	for i := 1; i < n+1; i++ {
		g[i] = make([]int, n+1)
		ints := eGetInts(scanner)
		num := ints[0]
		for j := 0; j < ints[1]; j++ {
			g[num][ints[j+2]] = 1
		}
	}
	dist := make([]int, n+1)
	for i := 0; i < len(dist); i++ {
		dist[i] = -1
	}
	q := []int{}

	// 訪問する
	q = append(q, 1)
	dist[1] = 0

	// キューが空でない限り
	for len(q) > 0 {
		// 先頭を取り出す
		top := 0
		top, q = q[0], q[1:]
		// 隣接マスを入れる.
		for i := 1; i < n+1; i++ {
			// 辺がある
			if g[top][i] == 1 {
				if dist[i] == -1 {
					// 訪問済みでなければ
					q = append(q, i)
					dist[i] = dist[top] + 1
				}
			}
		}
	}
	for i := 1; i < n+1; i++ {
		fmt.Println(i, dist[i])
	}
}

////////////////////////////////////////////////////////////////////////////////
// ライブラリ
////////////////////////////////////////////////////////////////////////////////
func makeScanner(maxByte int) *bufio.Scanner {
	scanner := bufio.NewScanner(os.Stdin)
	scanner.Buffer(make([]uint8, 0, 8192), maxByte)
	return scanner
}
func makeWordScanner() *bufio.Scanner {
	scanner := makeScanner(8192)
	scanner.Split(bufio.ScanWords)
	return scanner
}
func eGetLine(r *bufio.Scanner) string {
	if r.Scan() {
		return r.Text()
	}
	err := r.Err()
	if err != nil {
		log.Fatal(err)
	}
	// EOF
	return ""
}
func eGetInt(r *bufio.Scanner) int {
	line := eGetLine(r)
	return eAtoi(line)
}
func eGetInt64(r *bufio.Scanner) int64 {
	line := eGetLine(r)
	return eAtoInt64(line)
}
func eGetFields(r *bufio.Scanner) []string {
	line := eGetLine(r)
	return strings.Fields(line)
}
func eGetInts(r *bufio.Scanner) []int {
	fields := eGetFields(r)
	ints := make([]int, len(fields))
	for i := 0; i < len(ints); i++ {
		ints[i] = eAtoi(fields[i])
	}
	return ints
}
func eGetInt64s(r *bufio.Scanner) []int64 {
	fields := eGetFields(r)
	ints := make([]int64, len(fields))
	for i := 0; i < len(ints); i++ {
		ints[i] = eAtoInt64(fields[i])
	}
	return ints
}
func eGetChars(r *bufio.Scanner) []string {
	line := eGetLine(r)
	return strings.Split(line, "")
}
func eAtoi(s string) int {
	n, err := strconv.Atoi(s)
	if err != nil {
		log.Fatal(err)
	}
	return n
}
func eAtoInt64(s string) int64 {
	n, err := strconv.ParseInt(s, 10, 64)
	if err != nil {
		log.Fatal(err)
	}
	return n
}

C++: #define _GLIBCXX_DEBUG
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define ALL(v) v.begin(), v.end()
typedef long long ll;

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

#include <bits/stdc++.h>
using namespace std;

#define white 0
#define gray 1

int M[101][101];
int d[101],color[101];
queue<int> q;
int a,n;

void bfs(int u){
  color[u]=gray;
  q.push(u);
  while(!q.empty()){
    a=q.front();
    q.pop();
    for(int v=1;v<=n;v++){
      if(M[a][v]==1 && color[v]==white){
        color[v]=gray;
        d[v]=d[a]+1;
        q.push(v);
      }
    }
  }
}

int main(){
  int x,y,z;
  cin>>n;
  
  rep(i,101){
    rep(j,101) M[i][j]=0;
  }
  
  rep(i,101){
    d[i]=-1;
    color[i]=white;
  }
  d[1]=0;
  
  rep(i,n){
    cin>>x>>y;
    rep(j,y){
      cin>>z;
      M[x][z]=1;
    }
  }
  
  bfs(1);
  for(int i=1;i<n+1;i++) cout<<i<<" "<<d[i]<<endl;
  
  return 0;
}

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

struct graph {
	struct node {vector<int> v; int d = -1;};
	map<int, node> nodes;

	void read_all() {
		int n, id, k, v;
		cin >> n;
		while (n--) {
			cin >> id >> k;
			if (k)
				while (k--) {
					cin >> v;
					nodes[id].v.push_back(v);
				}
			else
				nodes[id].v = {};
		}
	}
	void traverse(int id) {
		nodes[id].d = 0;
		queue<int> q;
		q.push(id);
		while (!q.empty()) {
			node &n = nodes[q.front()];
			q.pop();
			for (int x: n.v) {
				if (nodes[x].d != -1)
					continue;
				else
					nodes[x].d = n.d + 1;
				q.push(x);
			}
		}
	}
	void display_all() {
		for (auto &n: nodes)
			cout << n.first << " " << n.second.d << endl;
	}
};

int main() {
	graph g;
	g.read_all();
	g.traverse(1);
	g.display_all();
}

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

using namespace 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;
  whie(!q.empty){
    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;
    }
  }
  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<k;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 <cmath>
#include <queue>
#include <iostream>
using namespace std;

int G[110][110] = {0};
int n;
int D[110] = {0};
void bfs(int src){
 queue<int> Q;
 Q.push(src);
 D[src] = 0;
 while(! Q.empty()){
  int cur = Q.front();
  Q.pop();
  for(int i=1; i<=n; i++){
   if(G[cur][i]==1 && D[i]==0 && i!=1){
    D[i] = D[cur]+1;
    Q.push(i);
   }
  }
 }

 for(int i=1; i<=n; i++){
  if(i!=1 && D[i]==0){
   D[i]=-1;
  }
  cout << i << " " << D[i] << endl;
 }
}

int main(){
 cin >> n;
 int u, k;
 int v[100000];
 for(int i=0; i<n; i++){
  cin >> u >> k;
  for(int j=0; j<k; j++){
   cin >> v[j];
   G[i+1][v[j]] = 1;
  }
 }
 bfs(1);
}

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

using namespace std;

#define N 100
#define WHITE 0
#define GRAY 1
#define BLACK 2
#define INFINITY -1

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

void bfs_visit(int u){

  queue<int> Q;
  color[u] = GRAY;
  Q.push(u);

  d[u] = 0;

  int present;
  while( !Q.empty() ){
    present = Q.front();
    Q.pop();
    color[present] = BLACK;

    for(int v=0;v<n;v++){
      if( M[present][v] == 1 && color[v] == WHITE ){
        Q.push(v);
        color[v] = GRAY;
        d[v] = d[present] + 1;
      }
    }  
  }
}

void bfs(int u){

  for(int i=0;i<n;i++){
    color[i] = WHITE;
    d[i] = INFINITY;
  }

  bfs_visit(u);

  for(int i=0;i<n;i++){
    cout << i+1 << " " << d[i] << endl;
  }
}


int main(void){

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

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

  bfs(0);

  return 0;
}

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

using namespace std;

int main(){
	int n, u, k, v;
	int D[100];
	bool adj[100][100] = {};
	int pushed[100] = {};
	cin >> n;
	for (int i = 1; i <= n; i++){
		cin >> u >> k;
		for (int j = 1; j <= k; j++){
			cin >> v;
			adj[u][v] = true;
		}
	}
	for (int i = 1; i <= n; i++){
		D[i] = -1;
	}
	queue<int> Q;
	Q.push(1);
	D[1] = 0;
	pushed[1] = 1;
	while(!Q.empty()){
		int m = Q.front();
		Q.pop();
		for (int i = 1; i <= n; i++){
			if (adj[m][i] == true && pushed[i] == 0){
				D[i] = D[m]+1;
				Q.push(i);
				pushed[i] = 1;
			}
		}
	}
	
	for (int i = 1; i < n+1; i++){
		cout << i << ' ' << D[i] << endl;
	}
}

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

#define rep(i, n) for (int i = 0; i < (int)(n); ++i)

const int INF = 1 << 21;

int main() {
  int n;
  std::cin >> n;

  int a[n][n];

  rep(i, n) rep(j, n) a[i][j] = 0;

  rep(i, n) {
    int u, k;
    std::cin >> u >> k;
    rep(j, k) {
      int v;
      std::cin >> v;
      a[u - 1][v - 1] = 1;
    }
  }

  int d[n];
  rep(i, n) d[i] = INF;
  d[0] = 0;

  std::queue<int> q;
  q.push(0);

  while (!q.empty()) {
    int u = q.front();
    q.pop();
    rep(j, n) {
      if (a[u][j] && d[j] == INF) {
        d[j] = d[u] + 1;
        q.push(j);
      }
    }
  }

  rep(i, n) std::cout << i + 1 << ' ' << (d[i] == INF ? -1 : d[i]) << '\n';

  return 0;
}