Go: package main

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

// I/O
type Scanner struct {
	sc *bufio.Scanner
}

func NewScanner() *Scanner {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)
	sc.Buffer(make([]byte, 1024), int(1e+9))
	return &Scanner{sc}
}

func (s *Scanner) nextStr() string {
	s.sc.Scan()
	return s.sc.Text()
}

func (s *Scanner) nextInt() int {
	i, e := strconv.Atoi(s.nextStr())
	if e != nil {
		panic(e)
	}
	return i
}

func (s *Scanner) nextFloat() float64 {
	f, e := strconv.ParseFloat(s.nextStr(), 64)
	if e != nil {
		panic(e)
	}
	return f
}

func (s *Scanner) nextRuneSlice() []rune {
	return []rune(s.nextStr())
}

func (s *Scanner) nextIntSlice(n int) []int {
	res := make([]int, n)
	for i := 0; i < n; i++ {
		res[i] = s.nextInt()
	}
	return res
}

func (s *Scanner) nextFloatSlice(n int) []float64 {
	res := make([]float64, n)
	for i := 0; i < n; i++ {
		res[i] = s.nextFloat()
	}
	return res
}

// Arithmetic
func max(nums ...int) int {
	m := nums[0]
	for _, i := range nums {
		if m < i {
			m = i
		}
	}
	return m
}

func min(nums ...int) int {
	m := nums[0]
	for _, i := range nums {
		if m > i {
			m = i
		}
	}
	return m
}

func abs(x int) int {
	if x > 0 {
		return x
	}
	return -x
}

func pow(x, y int) int {
	res := 1
	for i := 0; i < y; i++ {
		res *= x
	}
	return res
}

func ceil(a, b int) int {
	if a%b == 0 {
		return a / b
	} else {
		return a/b + 1
	}
}

// Sort
type RuneSlice []rune

func (a RuneSlice) Len() int           { return len(a) }
func (a RuneSlice) Less(i, j int) bool { return a[i] < a[j] }
func (a RuneSlice) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }

// Main
type Queue struct {
	arr []int
}

func (q *Queue) push(v int) {
	q.arr = append(q.arr, v)
}

func (q *Queue) pop() int {
	res := q.arr[0]
	q.arr = q.arr[1:]
	return res
}

func (q *Queue) isEmpty() bool {
	return len(q.arr) == 0
}

func main() {
	sc := NewScanner()
	wtr := bufio.NewWriter(os.Stdout)
	N := sc.nextInt()
	G := make([][]int, N)
	for i := 0; i < N; i++ {
		u, k := sc.nextInt()-1, sc.nextInt()
		for j := 0; j < k; j++ {
			G[u] = append(G[u], sc.nextInt()-1)
		}
	}
	var q Queue
	seen := make([]int, N)
	for i := 0; i < N; i++ {
		seen[i] = -1
	}
	var search func(cur int)
	search = func(cur int) {
		for i := 0; i < len(G[cur]); i++ {
			next := G[cur][i]
			if seen[next] == -1 {
				q.push(next)
				seen[next] = seen[cur] + 1
			}
		}
	}
	q.push(0)
	seen[0] = 0
	for !q.isEmpty() {
		search(q.pop())
	}

	for i := 0; i < N; i++ {
		fmt.Fprintln(wtr, i+1, seen[i])
	}
	wtr.Flush()
}

C++: #include <iostream>
#include <string>
#include <vector>
#include <set>
#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <functional>
#include <map>
#include <cmath>
#include <queue>

using namespace std;

static const int N = 100;

int main() {

    int graph[N][N] = {0};
    int distance[N] = {-200000};
    bool alreadySearched[N] = {false};

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


    queue<int> Q;
    Q.push(0);
    distance[0] = 0;
    alreadySearched[0] = true;

    while(!Q.empty()){
        int u = Q.front();
        for(int i=0;i<n;i++){
            if(!alreadySearched[i] && graph[u][i] == 1){
                Q.push(i);
                alreadySearched[i] = true;
                distance[i] = distance[u] + 1;
            }
        }
        Q.pop();
    }

    for(int i=0;i<n;i++){
        if(!alreadySearched[i]){
            distance[i] = -1;
        }
    }
    for(int i=0;i<n;i++){
        printf("%d %d\n", i+1, distance[i]);
    }

    return 0;
}

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];  // 距離で訪問状態(color)を管理する

void bfs(int s)
{
    queue<int> q;  // 標準ライブラリのqueueを使用
    q.push(s);
    for (int i = 0; i < n; i++) {
        d[i] = INFTY;  // 距離を十分に大きい値に初期化する
    }
    d[s] = 0;  // s(始点)の距離を0とする
    int u;
    while(!q.empty()) {  // キューにキーがある限り実行
        u = q.front();  // キューの一番上の要素をuにして
        q.pop();  // 削除
        for (int v = 0; v < n; v++) {
            if (M[u][v] == 0) {  // uからvへのパスがなければ次へ
                continue;
            }
            if (d[v] != INFTY) {  // 距離が十分に大きくなければ次へ
                continue;
            }
            d[v] = d[u] + 1;  // d[v]にd[u]の距離+1を入れる
            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;
typedef long long ll;
#define REP(i,n) for(ll i=0; i<(n); i++)
#define REP2(i,x,n) for(ll i=x; i<(n); i++)
#define REP3(i,x,n) for(ll i=x; i>(n); i--)
#define ALL(n) begin(n),end(n)
#define MAX 500000
#define SENTINEL 2000000000
#define NIL -1
static const int N=100;
static const int INFTY = (1<<21);
struct cww{cww(){ios::sync_with_stdio(false);cin.tie(0);}}star;
const long long INF = numeric_limits<long long>::max();
int n,M[N][N];
int d[N];//訪問状態の管理


void bfs(int s){
    queue<ll>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 <iostream>
#include <queue>

using namespace std;
#define N 100

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] = -1;
    }
    d[s] = 0;
    int u;
    while(!q.empty()) {
        u = q.front();
        q.pop();
        for(int v=0; v<n; v++) {
            if(M[u][v]) {
                continue;
            }
            if(d[v]!=-1) {
                continue;
            }
            d[v] = d[u] + 1;
            q.push(v);
        }
    }
    for(int i=0; i<n; i++) {
        cout << i+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;
}