Go: package main

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

type vertexId int

type vertex struct {
	id vertexId
	visitedAt int
	adjs []vertexId
}

func createVertex(id int, adjsInt []int) vertex {
	adjs := make([]vertexId, len(adjsInt))
	for i := 0; i < len(adjs); i++ {
		adjs[i] = vertexId(adjsInt[i])
	}
	return vertex{
		id: vertexId(id),
		visitedAt: -1,
		adjs: adjs,
	}
}

func (v *vertex) isVisited() bool {
	return v.visitedAt >= 0
}

func bfs(id vertexId, vqueue []vertexId, vertices []vertex) {
	vertex := &vertices[id-1]
	for _, vid := range vertex.adjs {
		if !vertices[vid-1].isVisited() {
			(&vertices[vid-1]).visitedAt = vertex.visitedAt+1
			vqueue = append(vqueue, vid)
		}
	}
	if len(vqueue) > 0 {
		nextId := vqueue[0]
		nextVqueue := vqueue[1:]
		bfs(nextId, nextVqueue, vertices)
	}
}

func solveBfs(vertices []vertex) {
	vertex := &vertices[0]
	vertex.visitedAt = 0
	vqueue := make([]vertexId, 0)
	bfs(vertex.id, vqueue, vertices)
}

func main() {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)

	n, err := nextInt(sc)
	if err != nil {
		panic(err)
	}

	vertices := make([]vertex, n)
	for i := 0; i < n; i++ {
		id, err := nextInt(sc)
		if err != nil {
			panic(err)
		}
		adjN, err := nextInt(sc)
		if err != nil {
			panic(err)
		}
		adjs := make([]int, adjN)
		for j := 0; j < adjN; j++ {
			adjId, err := nextInt(sc)
			if err != nil {
				panic(err)
			}
			adjs[j] = adjId
		}
		vertices[i] = createVertex(id, adjs)
	}

	solveBfs(vertices)

	for i := 0; i < n; i++ {
		fmt.Printf("%d %d\n", vertices[i].id, vertices[i].visitedAt)
	}
}

func nextText(sc *bufio.Scanner) string {
	sc.Scan()
	return sc.Text()
}

func nextInt(sc *bufio.Scanner) (int, error) {
	return strconv.Atoi(nextText(sc))
}

C++: #include<bits/stdc++.h>

using namespace std;

vector<int> G[110];

const int INF=1e9;

int d[110];
bool used[110];

void bfs(int x)
{
    fill(d,d+110,INF);
    d[x]=0;

    queue<pair<int,int> > q;

    q.push(make_pair(0,x));

    used[x]=true;

    while(!q.empty())
    {
        pair<int,int> tmp=q.front();q.pop();

        int dd=tmp.first,now=tmp.second;
        for(int i=0;i<G[now].size();i++)
        {
            if(!used[G[now][i]])
            {
                d[G[now][i]]=dd+1;
                q.push(make_pair(dd+1,G[now][i]));
                used[G[now][i]]=true;
            }
        }
    }
}


int main()
{
    int n;

    cin>>n;

    for(int i=0;i<n;i++)
    {
        int a,b,c;

        cin>>a>>b;

        for(int j=0;j<b;j++)
        {
            cin>>c;

            G[a].push_back(c);
        }
    }

    bfs(1);

    for(int i=1;i<=n;i++)
    {
        cout<<i<<" ";

        if(d[i]==INF)
        {
            cout<<"-1";
        }else
        {
            cout<<d[i];
        }
        cout<<endl;
    }

    return 0;
}

C++: /**
 * Bredth first search.
 */

#include <iostream>
using namespace std;
const int N = 101;
int adj[N][N] = {0};
int d[N]={-1};

void bfs(int n, int dd) {
	int k = adj[n][0];
	d[n] = dd++;
	for (int j=1;j<=k;j++) {
		bfs(adj[n][j], dd);
	}
}

int main()
{
	int n;
	cin >> n;
	for (int i=1;i<=n;i++){
		int j, k;
		cin >> j >> k;
		adj[j][0]=k;
		for (int m=1;m<=k;m++) {
			int a;
			cin >> a;
			adj[j][m]=a;
		}
	}

	bfs(1, 0);

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

	return 0;
}

C++: #include<stdio.h>
struct
{
    int Q[10000];
    int head=0,last=0;
    void push_Back(int x)
    {
        Q[last]=x;
        last=(last+1)%10000;
    }
    int pop()
    {
        int x=Q[head];
        head=(head+1)%10000;
        return x;
    }
    bool Empty()
    {
     return head==last;
    }
}myqueue;
const int N=100;
const int nil=10000000;
int n;
int tu[N][N];
int juli[N];
void BFS()
{
    for (int i=0;i<n;i++)
        juli[i]=nil;
  myqueue.push_Back(0);
  juli[0]=0;
  int u;
  while(!myqueue.Empty())
  {
      u=myqueue.pop();
      for (int v=0;v<n;v++)
      {
          if(tu[u][v]==0) continue;
          if(juli[v]!=nil) continue;
          juli[v]=juli[u]+1;
          myqueue.push_Back(v);
      }
  }
  for (int i=0;i<n;i++)
  {
      printf("%d %d\n",i+1,((juli[i]==nil)?(-1):juli[i]));
  }
}
int main()
{
    int u,v,k;
    scanf("%d",&n);
    for (int i=0;i<n;i++)
    {
        scanf("%d%d",&u,&k);
        u--;
        for (int j=0;j<k;j++)
        {
            scanf("%d",&v);
            v--;
            tu[u][v]=1;
        }
    }
    BFS();
    return 0;
}

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

using namespace std;

static const int MAX=100;
static const int INF =(1<<21);

int n,BY[MAX][MAX];
int dist[MAX];//距離で訪問状態を管理する

void bfs(int);

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

    scanf("%d",&n);
    for(i=0;i<n;i++){
        for(j=0;j<n;j++) BY[i][j]=0;
    }
    for(i=0;i<n;i++){
        scanf("%d%d",&u,&k);
        u--;
        for(j=0;j<k;j++){
            scanf("%d",&v);
            v--;
            BY[u][v]=1;
        }
    }
    bfs(0);

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

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;
    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] = 1;
        }
    }

    bfs (0);

    return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ull = unsigned long long;
//#define ll long long
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 (a>b) { a=b; return 1; } return 0; }
#define rep(i, n) REP(i, 0, n)
#define rep_rev(i, n) for (int (i) = (int)(n) - 1 ; (i) >= 0 ; --(i))
#define ALL(v) v.begin(), v.end()
#define MSG(a) cout << #a << " " << a << endl;
#define REP(i, x, n) for(int i = x; i < n; i++)
#define all(x) (x).begin(),(x).end()
ll tmp1,tmp2,tmp3;
const ll mod = 1000000007;
const int INF = 1e9;
const ll INFLONG = 1e18;
void swap(ll *x,ll *y){
  ll tmp;
  tmp = *x;
  *x = *y;
  *y = tmp;
}
//vector<ll> visited(100,0);
vector<ll> vec[100];
vector<ll> cou(100,-1);
ll sum = 0;
queue<pair<ll,ll>> q;
void bfs(ll k,ll num){
  q.push(make_pair(k,num));
  pair<ll,ll> piv;
  while(!q.empty()){
    piv = q.front();
    q.pop();
    if(cou[piv.first] != -1){
      continue;
    }
    cou[piv.first] = piv.second;
    for(auto itr:vec[piv.first]){
      q.push(make_pair(itr,piv.second+1));
    }
  }
  cou[k] = num;

}
int main(){
  ll n;
  cin >> n;
  ll u,k,v;
  rep(i,n){
    cin >> u >> k;
    u--;
    rep(j,k){
      cin >> v;
      v--;
      vec[u].push_back(v);
    }
  }
  bfs(0,0);
  rep(i,n){
    cout << i+1 << " " << cou[i] << endl;
  }
}