Go: package main

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

func getScanner(fp *os.File) *bufio.Scanner {
	scanner := bufio.NewScanner(fp)
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
	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 getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}

func getNextUint64(scanner *bufio.Scanner) uint64 {
	i, _ := strconv.ParseUint(getNextString(scanner), 10, 64)
	return i
}

func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}

func main() {
	fp := os.Stdin
	wfp := os.Stdout
	cnt := 0

	if os.Getenv("MASPY") == "ますピ" {
		fp, _ = os.Open(os.Getenv("BEET_THE_HARMONY_OF_PERFECT"))
		cnt = 1
	}
	if os.Getenv("MASPYPY") == "ますピッピ" {
		wfp, _ = os.Create(os.Getenv("NGTKANA_IS_GENIUS10"))
	}

	scanner := getScanner(fp)
	writer := bufio.NewWriter(wfp)
	solve(scanner, writer)
	for i := 0; i < cnt; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
	writer.Flush()
}

func solve(scanner *bufio.Scanner, writer *bufio.Writer) {
	n := getNextInt(scanner)
	g := graph{}
	g.ee = make([]Edges, n)
	g.visited = make([]bool, n)
	g.found = make([]int, n)
	g.leave = make([]int, n)
	for i := 0; i < n; i++ {
		u := getNextInt(scanner) - 1
		k := getNextInt(scanner)
		for j := 0; j < k; j++ {
			v := getNextInt(scanner) - 1
			g.ee[u] = append(g.ee[u], Edge{
				to: v,
				id: u,
			})
		}
	}
	for i := 0; i < n; i++ {
		sort.Sort(g.ee[i])
	}
	for i := 0; i < n; i++ {
		if g.visited[i] {
			continue
		}
		g.dfs(i)
	}

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

// Edge ...
type Edge struct {
	to, id int
}

type Edges []Edge

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

type graph struct {
	ee           []Edges
	t            int
	n            int
	visited      []bool
	found, leave []int
}

func (g *graph) dfs(i int) {
	g.visited[i] = true
	g.t++
	g.found[i] = g.t
	for _, e := range g.ee[i] {
		if g.visited[e.to] {
			continue
		}
		g.dfs(e.to)
	}
	g.t++
	g.leave[i] = g.t
}

C++: #include <iostream>
#include <stack>
using namespace std;

static const int N=100;

static const int WHITE=0;

static const int GRAY=1;

static const int BLACK=2;





//用栈实现深度优先搜索


/**
 * color 标记访问状态的数组，
 * M[N][N] 邻接矩阵 如果存在定点i到顶点j的边，则M[i][j]=trul
 * Stack 栈，暂存访问过程中的顶点
**/
int n,M[N][N];
int color[N],d[N],f[N],tt;
int nt[N];


//按序号，获取和u相邻的v
int next(int u){
    for(int v=nt[u];v<n;v++){
        nt[u]=v+1;
        if(M[u][v]) return v;
    }
    return -1;
}

//用栈实现深度优先搜索
void dfs(int r){
    for(int i=0;i<n;i++) nt[i]=0;

    stack<int> S;
    S.push(r);
    color[r]=GRAY;
    d[r]=++tt;

    while(!S.empty()){
        int u=S.top();
        int v=next(u);

        if(v!=-1){
            if(color[v]==WHITE){
                color[v]=GRAY;
                d[v]=++tt;
                S.push(v);
            }
        }else{
            S.pop();
            color[u]=BLACK;
            f[u]=++tt;
        }
    }

}

void dfs(){
    //初始化
    for(int i=0;i<n;i++){
        color[i]=WHITE;
        nt[i]=0;
    }
    tt=0;

    for(int u=0;u<n;u++){
        if(color[u]==WHITE)
            dfs(u);
    }
    for(int i=0;i<n;i++){
        cout<<i+1<<" "<<d[i]<<" "<<f[i]<<endl;
    }
    return;
}
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 i=0;i<k;i++){
            cin>>v;
            v--;
            M[u][v]=1;
        }
    }

    dfs();
    return 0;
}

C++: #include<iostream>
#include<stack>
using namespace std;
#define N 101
#define gray 1
#define white 0
#define black 2
int n,m[N][N];
int color[N],d[N],f[N],tt;
int nt[N];
int next(int u)
{
	for(int v=nt[u];v<n;v++)
	{
		nt[u]=v+1;
		if(m[u][v]) return v;
	}
	return -1;
}
void dfs_v(int u)
{
	for(int i=1;i<=n;i++)
	{
		nt[i]=0;
	}
	stack<int> s;
	s.push(u);
	d[u]=++tt;
	color[u]=gray;
	while(!s.empty())
	{
		int x=s.top();
		int v=next(x);
		if(v!=-1)
		{
			if(color[v]==white)
			{
				color[v]=gray;
				d[v]=++tt;
				s.push(v);
			}
		}else
			{
				s.pop();
				color[x]=black;
				f[x]=++tt;
			}
	}
}
void dfs()
{
	for(int i=1;i<=n;i++)
	{
		color[i]=white;
		nt[i]=0;
	}
	tt=0;
	for(int i=1;i<=n;i++)
	{
		if(color[i]==white)
		{
			dfs_v(i);
		}
	}
	for(int i=1;i<=n;i++)
	{
		printf("%d %d %d\n",i,d[i],f[i]);
	}
}
int main()
{
	int v,k,u;
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		for(int j=1;j<=n;j++)
		{
			m[i][j]=0;
		}
	}
	for(int i=1;i<=n;i++)
	{
		cin>>u>>k;
		for(int j=1;j<=k;j++)
		{
			cin>>v;
			m[u][v]=1;
		}
	}
	dfs();
	return 0;
}

C++: #include <iostream>
using namespace std;

static const int N = 100;
static const int WHITE = 0;
static const int GRAY = 1;
static const int BLACK = 2;

int M[N][N] = {0}, color[N] = {0}, d[N], f[N], tt = 0, n;

void dfs_visit(int u) {
  int v;
  color[u] = GRAY;
  d[u] = ++tt;
  for (v = 0; v < n; v++) {
    if (M[u][v] == 0) continue;
    if (color[v] == WHITE) {
      dfs_visit(v);
    }
  }
  color[u] = BLACK;
  f[u] = ++tt;
}

int main(void) {
  int u, v, k, i, j;

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

  for (u = 0; u < n; u++) {
    cout << u + 1 << " " << d[u] << " " << f[u] << endl;
  }

  return 0;
}

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

#define White 0 //未訪問
#define Gray 1 //訪問中、または未訪問へのEdgeがある
#define Black 2 //訪問済み

int n;
int Graph[100][100] = {};

int color[100] = {}, d[100], f[100], tt; 
// d[v] = v 訪問時の時間 f[v] = v の隣接リスト調査後の時間 tt = 時間の記録

int nt[100] = {};


//u に隣接する v を番号順に取得
int next(int u){
  for(int v = nt[u] ; v < n ; v++ ){
    nt[u] = v + 1;
    if(Graph[u][v] != 0) return v;
  }
  return -1;
}

void dfs_visit(int r){
  stack<int> S;
  S.push(r); //スタート地点をスタックに積む

  color[r] = Gray; //スタート地点を訪問済みに

  tt++;
  d[r] = tt; //時間を取得

  while(!S.empty()){
    int u = S.top();  //topの値を入れる
    int v = next(u);
    if(v != -1){
      //末訪問なら訪問中にし時間を取得、次の頂点をスタックに積む
      //どちらでもなければ、popでスタックから外し訪問済みにする
      if(color[v] == White){ 
	color[v] = Gray;
	tt++;
	d[v] = tt;
	S.push(v);
      }
    }else{
      S.pop();
      color[u] = Black;
      tt++;
      f[u] = tt;
    }
  }
}
  
void dfs(){
  tt = 0;

  for(int u = 0 ; u < n ; u++){
    if(color[u] == White) dfs_visit(u); //その頂点が未訪問なら
  }

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

int main(){
  int u, k, v; //u = 頂点番号 k = 出次数 v = u に隣接する頂点番号

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

  dfs();
     
  return 0;
}