Go: package main

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

func getScanner(fp *os.File) *bufio.Scanner {
	scanner := bufio.NewScanner(fp)
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 500001), 500000)
	return scanner
}

func getNextString(scanner *bufio.Scanner) string {
	scanner.Scan()
	return scanner.Text()
}

func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}

func main() {
	fp := os.Stdin
	if len(os.Args) > 1 {
		fp, _ = os.Open(os.Args[1])
	}

	scanner := getScanner(fp)
	writer := bufio.NewWriter(os.Stdout)

	n := getNextInt(scanner)
	nodes := make([]Node, n)

	for i := 0; i < n; i++ {
		nodes[i].list = make([]int, 0)
		nodes[i].d = -1
	}

	for i := 0; i < n; i++ {
		u := getNextInt(scanner)
		k := getNextInt(scanner)
		u--
		for ii := 0; ii < k; ii++ {
			v := getNextInt(scanner)
			v--
			nodes[u].list = append(nodes[u].list, v)
		}
	}

	queue := make([]int, n)
	queue[0] = 0
	nodes[0].d = 0
	d := 0
	i, j := 0, 1
	for i < j {
		d++
		prev := j
		for i < prev {
			for k, l := 0, len(nodes[queue[i]].list); k < l && i < n; k++ {
				if nodes[nodes[queue[i]].list[k]].d != -1 {
					continue
				}
				nodes[nodes[queue[i]].list[k]].d = d
				queue[j] = nodes[queue[i]].list[k]
				j++
			}
			i++
		}
	}

	for i := 0; i < n; i++ {
		fmt.Fprintln(writer, fmt.Sprintf("%d %d", i+1, nodes[i].d))
	}

	writer.Flush()
}

// Node ...
type Node struct {
	list []int
	d    int
}

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

using namespace std;
static const int N = 100;
static const int INFTY = (1 << 21);

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

void bfs(int s){
  int i, u;
  queue<int> q;
  q.push(s);
  for(i=0;i<n;i++) d[i] = INFTY;
  d[s] = 0;
  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);
    }
  } // end while

  for(i=0;i<n;i++)cout << i+1 << " " << ((d[i] == INFTY)?(-1):d[i]) << endl;
  
}

int main(){
  
  int u, k, v;
  int 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--; // change to origin
    for(j=0;j<k;j++){
      cin >> v;
      v--;
      M[u][v] = 1;
    }
  }

  bfs(0);

  return 0;
}

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

int main(void)
{
     //??£??\??????????????£??\???????????????
    int n, k;

    cin >> n;
    vector<vector<bool> > A(n, vector<bool>(n, false));
    for(int i = 0; i < n; i++){
        cin >> k >> k;
        for(int j = 0; j < k; j++){
            int input;
            cin >> input;
            A[i][input-1] = true;
        }
    }

    vector<int> u(n, 1000000);
    u[0] = 0;

    for(int i = 0; i < n; i++){
        for(int j = 0; j < n; j++){
            if(u[j] == i){
                for(int k = 0; k < n; k++){
                    if(A[j][k] == 1) u[k] = min(i+1, u[k]);
                }
            }
        }
    }
    for(int i = 0; i < n; i++){
        if(u[i] != 1000000) cout << i + 1 << " " << u[i] << endl;
        else cout << i + 1 << " " << "-1" << endl;
    }
    return 0;

}