Go: package main

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

type AdjacentList struct {
	matrix [][]int
}

func NewEmptyAdjacentList(dim int) *AdjacentList {
	matrix := make([][]int, dim)
	for i := 0; i < dim; i++ {
		matrix[i] = make([]int, dim)
	}
	return &AdjacentList{matrix: matrix}
}

func (al *AdjacentList) set(node int, adjacent int) {
	al.matrix[node-1][adjacent-1] = 1
}

func (al *AdjacentList) findAdjacentsFor(node int) []int {
	adjacents := []int{}
	for i, v := range al.matrix[node-1] {
		if v == 1 {
			adjacents = append(adjacents, i+1)
		}
	}
	return adjacents
}

type DistanceList struct {
	list []int
}

func NewDistanceList(dim int) *DistanceList {
	list := make([]int, dim)
	for i := 0; i < dim; i++ {
		list[i] = -1
	}
	return &DistanceList{list: list}
}

func (dl *DistanceList) set(node int, distance int) {
	dl.list[node-1] = distance
}

func (dl *DistanceList) get(node int) int {
	return dl.list[node-1]
}

func (dl *DistanceList) isVisited(node int) bool {
	return dl.list[node-1] >= 0
}

type Position struct {
	node     int
	distance int
}

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

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

	al := NewEmptyAdjacentList(dim)

	for i := 1; i <= dim; i++ {
		node, err := nextInt(sc)
		if err != nil {
			panic(err)
		}

		adjacentNum, err := nextInt(sc)
		if err != nil {
			panic(err)
		}
		for j := 0; j < adjacentNum; j++ {
			adjacent, err := nextInt(sc)
			if err != nil {
				panic(err)
			}
			al.set(node, adjacent)
		}
	}

	dl := NewDistanceList(dim)

	bfs(al, dl)

	for i := 1; i <= dim; i++ {
		fmt.Printf("%d %d\n", i, dl.get(i))
	}
}

func bfs(al *AdjacentList, dl *DistanceList) {
	stack := []Position{Position{node: 1, distance: 0}}
	for len(stack) > 0 {
		currentPosition := stack[0]
		stack = stack[1:]
		if !dl.isVisited(currentPosition.node) {
			dl.set(currentPosition.node, currentPosition.distance)
		}
		for _, v := range al.findAdjacentsFor(currentPosition.node) {
			stack = append(stack, Position{node: v, distance: currentPosition.distance + 1})
		}
	}
}

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

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

class Graph{
private:





 class Node{
 private:
  unsigned long node_id_;
  long depth_;

  std::vector<unsigned long> adjnodes_;
 public:

  Node(const unsigned long node_id,const std::vector<unsigned long> &adjnodes)
      : node_id_(node_id),
        depth_(-1),
        adjnodes_(adjnodes){
   if(node_id_ == 1) depth_ = 0;
  };

  bool isDepth(){
   if(depth_ == -1) return true;

   return false;
  };

  void CheckNode(std::queue<unsigned long>& queue_nextnode,const std::vector<Node*>& node){
   for(unsigned long adjnode_i = 0, adjnode_max = adjnodes_.size(); adjnode_i < adjnode_max; ++adjnode_i){
    unsigned long nextadjnode = adjnodes_[adjnode_i]-1;
    if(node[nextadjnode]->isDepth()){
     node[nextadjnode]->depth_ = depth_ + 1;
     queue_nextnode.push(nextadjnode);
    }
   }
  };

  void display(){
   std::cout << node_id_ << " ";
   std::cout << depth_ << std::endl;
  };
 protected:
 };





 std::vector<Node*> node_;

public:
 Graph(unsigned long node_max) : node_(std::vector<Node*>(node_max, 0)){};
 void CreateNode(const unsigned long node_i,const unsigned long node_id,const std::vector<unsigned long>& adjnodes){
  node_[node_i] = new Node(node_id, adjnodes);
 };

 void BreadthFirstSearch(){
  if(node_.empty()) return ;

  std::queue<unsigned long> queue_nextnode;
  queue_nextnode.push(0);
  while(!queue_nextnode.empty()){
   unsigned long nextnode = queue_nextnode.front();
   queue_nextnode.pop();
   node_[nextnode]->CheckNode(queue_nextnode, node_);

  }

 };

 void display(){
  for(unsigned long node_i = 0, node_max = node_.size(); node_i < node_max; ++node_i){
   node_[node_i]->display();
  }
 };
protected:

};


int main(){

 unsigned long node_max = 0; std::cin >> node_max;

 /*
  *  ノード数分の記憶領域を確保する。
  */
 Graph graph(node_max);

 /*
  *入力はテキスト。
  *入力は一行目に    [ノード数]
  *      二行目以降  [頂点id 接続ノード数 接続ノード1 接続ノード2 ...]
  */
 for(unsigned long node_i = 0; node_i < node_max; ++node_i){
  unsigned long node_id = 0; std::cin >> node_id;
  unsigned long adjnode_max = 0; std::cin >> adjnode_max;
  std::vector<unsigned long> adjnodes(std::vector<unsigned long>(adjnode_max, 0));
  for(unsigned long adjnode_i = 0; adjnode_i < adjnode_max; ++adjnode_i){
   std::cin >> adjnodes[adjnode_i];
  }

  graph.CreateNode(node_i, node_id, adjnodes);
 }

 graph.BreadthFirstSearch();
 graph.display();

 return 0;
};

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

using namespace std;

typedef vector<int> vec;
typedef vector<vec> Graph;

Graph G(110);

int main()
{
	int n;
	scanf("%d",&n);
	for(int i=0;i<n;i++)
	{
		int u,t;
		scanf("%d%d",&u,&t);
		for(int j=0;j<t;j++)
		{
			int v;
			scanf("%d",&v);
			G[u].push_back(v);
		}
	}
	queue<int> que;
	int d[110];
	fill(d+1,d+n+1,-1);
	d[1]=0;
	que.push(1);
	while(!que.empty())
	{
		int t=que.front();que.pop();
		for(int i=0;i<G[t].size();i++)
			if(d[G[t][i]]==-1||d[t]+1<d[G[t][i]])
			{
				d[G[t][i]]=d[t]+1;
				que.push(G[t][i]);
			}
	}
	for(int i=1;i<=n;i++)
		printf("%d %d\n",i,d[i]);
	return 0;
}

C++: #include<iostream>
#include<queue>
using namespace std;
static const int INFTY=(1<<21);
static const int N=100;
int n,M[N][N],d[N];

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

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

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

  return 0;
}