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
func main() {
	sc := NewScanner()
	wtr := bufio.NewWriter(os.Stdout)
	N := sc.nextInt()
	g := make([][]int, N)
	for i, _ := range g {
		g[i] = make([]int, N)
	}
	for i := 0; i < N; i++ {
		u, k := sc.nextInt(), sc.nextInt()
		for j := 0; j < k; j++ {
			g[u-1][sc.nextInt()-1] = 1
		}
	}

	for _, r := range g {
		for i, num := range r {
			if i > 0 {
				fmt.Fprint(wtr, " ")
			}
			fmt.Fprint(wtr, num)
		}
		fmt.Fprintln(wtr)
	}
	wtr.Flush()
}

C++: #include <stdio.h>
#include <stdint.h>
#include <iostream>
#include <fstream>
#include <cassert>
#include <climits>
using namespace std;

#define DEBUG (0)

#if DEBUG
#define DPRINTF(...) do { \
    printf("D(L%d) %s: ", __LINE__, __func__); \
    printf(__VA_ARGS__); \
  } while (false)
#else
#define DPRINTF(...)
#endif // DEBUG


int main()
{
  int n;
  cin >> n; cin.ignore();

  DPRINTF("num of nodes: %d\n", n);

  bool graph[n][n];

  // init
  for (int i = 0; i < n; i++)
    for (int j = 0; j < n; j++)
      graph[i][j] = 0;

  // make a graph
  for (int i = 0; i < n; i++)
  {
    int node;
    int degree;

    cin >> node >> degree;

    DPRINTF("node %d (degree %d)\n", node, degree);

    for (int j = 0; j < degree; j++)
    {
      int adj; cin >> adj;

      // note that index starts from #0 though node and adj from #1
      graph[node - 1][adj - 1] = true;
    }

    cin.ignore();
  }

  // print a graph as a matrix form
  for (int i = 0; i < n; i++)
  {
    for (int j = 0; j < n; j++)
    {
      if (j == 0)
        printf("%d", graph[i][j]);
      else
        printf(" %d", graph[i][j]);
    }
    cout << endl;
  }

  return 0;
}

C++: #include<iostream>
#include<vector>
using namespace std;
int main() {
  int n;
  cin >> n;
  vector<vector<int>> ln(n, vector<int>(n+1, 0));
  vector<vector<int>> m(n,vector<int>(n,0));
  vector<int> rem(n, 0);
  for (int i = 0; i < n; i++)
    {
      cin >> ln[i][0];
      cin >> ln[i][1];
      for (int j = 2; j < ln[i][1]+2; j++)
	{
	  cin >> ln[i][j];
	}
    }
  for (int i = 0; i < n; i++)
    {
      for (int j = 2; j < n; j++)
	{
	  if (ln[i][j] != 0 )
	    {
	      m[i][ln[i][j]-1] = 1;
	    }
	}
    }
  for (int i = 0; i < n; i++)
    {
      for (int j = 0; j < n; j++)
	{
	  cout << m[i][j] << " ";
	}
      cout << endl;
    }
  return 0;
}

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

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

C++: #include<iostream>
using namespace std;
static const int N = 100;

int main() {
	int M[N][N];
	int n, 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;
		}
	}

	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			if (j) cout << " ";
			cout << M[i][j];
		}
		cout << endl;
	}
	return 0;
}

C++: #include <iostream>
#include <algorithm>
#include <cstdio>
#include <cmath>
#include <string>
#include <cctype>
#include <stack>
#include <queue>
#include <vector>
#include <cstdlib>
#include <list>
#define _USE_MATH_DEFINES
#include <math.h>

using namespace std;

static const int N = 100;

int main() {

	int M[N][N] = { 0 };
	int n, u, k, v;

	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;
		}
	}

	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			if (j)cout << " ";
			cout << M[i][j];
		}
		cout << endl;
	}

	return 0;
}

C++: #include <algorithm>
#include <bitset>
#include <cassert>
#include <cmath>
#include <ctime>
#include <cstring>
#include <functional>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>

#define rep(i,n)   for (int i = 0; i < (n); ++i)
#define sort(a)    sort((a).begin(), (a).end());
#define uniq(a)    SORT(a);(a).erase(unique((a).begin(), (a).end()), (a).end());
#define find(a,x)  find((a).begin(), (a).end(), (x)) != (a).end()
#define reverse(a) reverse((a).begin(), (a).end());
#define out(d) cout << (d);
#define outl(d) std::cout<<(d)<<"\n";
#define Yes() printf("Yes\n");
#define No() printf("No\n");
#define YES() printf("YES\n");
#define NO() printf("NO\n");
#define ceil(x, y) ((x + y - 1) / (y))

using namespace std;
using ll = long long;
using P = pair<ll,ll>;

const ll MOD = 1000000007; // 10^9 + 7

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  srand((unsigned)time(NULL));

  int n; cin >> n;
  int mat[n][n]; memset(mat, 0, sizeof(mat));

  for (int i = 0; i < n; i++) {
    int u; cin >> u;
    int k; cin >> k;
    for (int ki = 0; ki < k; ki++) {
      int v; cin >> v;
      mat[u - 1][v - 1] = 1;
    }
  }

  for (int i = 0; i < n; i++) {
    cout << mat[i][0];
    for (int j = 1; j < n; j++) {
      cout << " " << mat[i][j];
    }
    cout << endl;
  }
}

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;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    int n;scanf("%d",&n);
    int u;
    int k;
    vector<vector<int> > graph;
    graph.resize(n);
    for(int i=0;i<n;i++){
        graph[i].resize(n);
    }
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            graph[i][j]=0;
        }
    }

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

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

    return 0;
}