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

using namespace std;
using Graph=vector<vector<int>>;

void breadth_firstsearch(Graph &graph,int vertex,queue<int> qdata,vector<int> &distance){
  distance.at(vertex)=0;
  qdata.push(vertex);
  while(!qdata.empty()){
    int ver=qdata.front();
    qdata.pop();
    for(int v : graph.at(ver)){
      if(distance.at(v)!=-1) continue;
      distance.at(v)=distance.at(ver)+1;
      qdata.push(v);
    }
  }
}


int main(void) {
	int size, vnum, adjnum, temp;
	cin >> size;
	Graph graph(size);
	queue<int> qdata;
	vector<int> distance(size,-1);

	for (int i = 0; i < size; i++) {
		cin >> vnum >> adjnum;
		for (int j = 0; j < adjnum; j++) {
			cin >> temp;
			graph.at(vnum - 1).push_back(temp - 1);
		}
	}
  breadth_firstsearch(graph,0,qdata,distance);

	for (int i = 0; i < size; i++) {
		cout << i + 1 << " " <<distance.at(i)<< endl;
	}
	return 0;
}

C++: #include "bits/stdc++.h"
using namespace std;
#define rep(i, n) for(int i=0;i<(n);i++)
const int INF = 1001001001;
int n, u, k;
int D[100];
vector<int> edges[100];
void bfs(int src) {
	
	
	queue<int> Q;	
	Q.push(src);
	D[src] = 0;//D[*]が始点から点*への距離
	while (!Q.empty()) {
		int cur = Q.front();//curは今取り扱ってる点
		Q.pop();
		
		for (int dst = 0; dst < n; dst++) {//dstはcurから移動可能な点
			vector<int>::iterator result = find(edges[cur].begin(), edges[cur].end(), dst);
			if (result != edges[cur].end() && D[dst] == INF) {
				D[dst] = D[cur] + 1;
				Q.push(dst);
			}
		}
	}
}

int main() {
	cin >> n; //n頂点
	

	for (int i = 0; i < n; i++)//iは頂点
	{
		cin >> u >> k;
		for (int j = 0; j < k; j++)
		{
			int l;
			cin >> l;
			edges[u - 1].push_back(l-1);
		}//入力終わり
		D[i] = INF;
	}
		bfs(0);
	for (int i = 0; i < n; i++) {
		if (D[i] != INF)cout << i + 1 << " " << D[i] << endl;
		else cout << i + 1 << " " << -1 << endl;
	}
	return 0;
}

C++: #include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<tuple>
#include<map>
#include<queue>
#include<set>
#include<stack>
#include<deque>
#include<cmath>
#include<stack>
#define rep(i,n) for(int i = 0;i<n;i++)
#define _GLIBCXX_DEBUG
using ll = long long; 
using namespace std;

static const int N = 100;
static const int INF = (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] = INF;
    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] != INF) continue;
            d[v] = d[u]+1;
            q.push(v);
        }
    }
    for(int i = 0;i < n; i++) {
        cout << i+1 << " " << ( (d[i] == INF) ? (-1):d[i]) << endl;
    }}

    int main() {
        int u,k,v;
        rep(i,n) {
            rep(j,n) {
                M[i][j] = 0;
            }
        }
        cin >> n;
        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 WHITE 0 //未発見
#define GRAY 1 //発見
#define BLACK 2 //探索済み
#define NIL -1
#define rep(i,n) for(int i=0;i<n;i++)
using namespace std;
typedef vector< vector<int> > table;

void bfs(table& m,int s)
{
    vector<int> color(m.size(),WHITE);
    vector<int> dist(m.size(),NIL);
    queue<int> q;
    q.push(s);
    color[s]=GRAY;
    dist[s]=0;

    while (!q.empty())
    {
        int u=q.front();q.pop();
        rep(v,m.size())
        {
            if(dist[v]!=NIL)continue;
            if(m[u][v]==1 && color[v]==WHITE)
            {
                dist[v]=dist[u]+1;
                color[v]=GRAY;
                q.push(v);
            }
        }
        color[u]=BLACK;
    }
    
    rep(i,m.size()) cout<<i+1<<" "<<dist[i]<<endl;
}

int main()
{
    int n;
    cin>>n;
    table m(n,vector<int>(n,0));
    rep(i,n)
    {
        int u,k;
        cin>>u>>k;
        rep(j,k)
        {
            int v;
            cin>>v;
            m[u-1][v-1]=1;
        }
    }

    bfs(m,0);

    return 0;
}

C++: #include <queue>
#include <map>
#include <cstdio>
using namespace std;
main(){
	int t=0,T,i,j,k;
	map<int,vector<int> >a;
	for(scanf("%d",&T);t<T;t++)for(scanf("%d%d",&i,&k);k--;a[i].push_back(j))scanf("%d",&j);
	map<int,int>m;
	queue<int>q;
	for(q.push(1),m[1]=1;!q.empty();){
		k=q.front();q.pop();
		for(i=0;i<a[k].size();i++)if(!m[a[k][i]])m[a[k][i]]=m[k]+1,q.push(a[k][i]);
	}
	for(i=1;i<=T;i++)printf("%d %d\n",i,m[i]-1);
}