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 := 0; i < N; i++ {
		u, k := sc.nextInt()-1, sc.nextInt()
		for j := 0; j < k; j++ {
			G[u] = append(G[u], sc.nextInt()-1)
		}
	}
	ans := make([][2]int, N)
	time := 0
	found := make(map[int]bool)
	var dfs func(cur int)
	dfs = func(cur int) {
		time++
		ans[cur][0] = time
		found[cur] = true
		for i := 0; i < len(G[cur]); i++ {
			next := G[cur][i]
			if !found[next] {
				dfs(G[cur][i])
			}
		}
		time++
		ans[cur][1] = time
	}
	for i := 0; i < N; i++ {
		if !found[i] {
			dfs(i)
		}
	}

	for i := 0; i < N; i++ {
		fmt.Fprint(wtr, i+1)
		for j := 0; j < 2; j++ {
			fmt.Fprint(wtr, " ")
			fmt.Fprint(wtr, ans[i][j])
		}
		fmt.Fprintln(wtr)
	}
	wtr.Flush()
}

C++: #include <iostream>
#include <vector>
#include <iomanip>
#include <cassert>
#include <cmath>
using namespace std; typedef long long ll; ll an=0; const ll INF = 1e18; const ll MOD = 1e9+7;
typedef pair<int,int> P;
vector<int> v[100];
int ts, st[100], ed[100];

void dfs(int from) {
  if (st[from] == -1) st[from]=++ts;
  else return;
  for(int to:v[from]) {
    if (st[to] == -1) dfs(to);
  }
  if (ed[from] == -1) ed[from]=++ts; return;
}
int main(){
  int n; cin>>n;
  for(int i=0;i<n;i++) {
    int _, k; cin>>_>>k;
    for(int j=0;j<k;j++) {
      int x; cin>>x; x--;
      v[i].push_back(x);
    }
  }
  ts=0;
  fill(st, st+n, -1); fill(ed, ed+n, -1);
  for(int i=0;i<n;i++) dfs(i);
  for(int i=0;i<n;i++) {
    cout<<i+1<<" "<<st[i]<<" "<<ed[i]<<endl;
  } return 0;
}

C++: #include <iostream>

using namespace std;

int a[124][124] = {{}};
int start[124] = {};
int e[124] = {};
int c = 0;
int n;
void dfs(int k){
  if(start[k] != 0) return;
  c++;
  start[k] = c;

  for(int i = 0;i < n;i++){
    if(a[k][i] == 1){
      dfs(i);
    }
  }
  c++;
  e[k] = c;
}
int main(){

  int u,k,x;
  cin >> n;



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


  for(int i = 0;i < n;i++)  dfs(i);

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

C++: #include<bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < n; i++)
using namespace std;
using ll = long long;

vector<bool> seen;
vector<int> first;
vector<int> last;

void dfs(const vector<vector<int>> &g, int v, int &ptr){
  first[v] = ptr++;
  seen[v] = true;
  
  for(int i : g[v]){
    if(seen[i]) continue;
    dfs(g,i,ptr);
  }
  
  last[v] = ptr++;
}

int main() {
  int n;
  cin >> n;
  seen.assign(n,false);
  first.resize(n);
  last.resize(n);
  
  vector<vector<int>> g(n);
  
  rep(i,n){
    int u, k;
    cin >> u >> k;
    u--;
    vector<int> v(k);
    rep(j,k){
      cin >> v[j];
      v[j]--;
      g[u].push_back(v[j]);
    } 
  }
  int ptr = 1;
  rep(i,n){
    if(first[i] == 0){
      dfs(g,i,ptr);
    }
  }


  rep(i,n){
    cout << i + 1 << ' ' <<first[i] << ' ' << last[i] << endl;
  } 
}

C++: #include <iostream>
using namespace std;
int a[100][100]={},f[100]={},d[100]={},T[200]={};
int main(){
	int n;
	cin>>n;
	for(int i=0;i<n;i++){
		int u,k;
		cin>>u>>k;
		for(int j=0;j<k;j++){
			cin>>a[u][j];
		}
	}
	T[1]=1;
	f[1]=1;
	for(int time=2;time<=2*n;time++){
		for(int j=0;j<100;j++){
			if(a[T[time-1]][j]==0){
				d[T[time-1]]=time;
				T[time]=T[f[T[time-1]]-1];
				break;
			}
			else if(f[a[T[time-1]][j]]==0){
				f[a[T[time-1]][j]]=time;
				T[time]=a[T[time-1]][j];
				break;
			}
		}
	}
	for(int i=1;i<=n;i++){
		cout<<i<<" "<<f[i]<<" "<<d[i]<<endl;
	}
}

C++: #include <cstdio>

typedef struct vertex_{
    int found;
    int d;
    int f;
}vertex;

int search(vertex *array, int (*A)[101], int id, int n, int time){
    if(array[id].found)return time;
    array[id].found=1;
    array[id].d=++time;
    for(int i=1;i<=n;i++){
        if(A[id][i])time=search(array,A,i,n,time);
    }
    array[id].f=++time;
    return time;
}

int main(){
    int i, j, n, u, k, v;
    scanf("%d",&n);
    vertex array[n+1];
    for(i=1;i<=n;i++)array[i].found=0;
    int A[101][101];
    for(i=1;i<=n;i++){
        for(j=1;j<=n;j++){
            A[i][j]=0;
        }
    }
    for(i=1;i<=n;i++){
        scanf("%d %d",&u,&k);
        for(j=0;j<k;j++){
            scanf("%d",&v);
            A[u][v]=1;
        }
    }
    int time = search(array, A, 1, n, 0);
    for(i=1;i<=n;i++)printf("%d %d %d\n",i,array[i].d,array[i].f);
    return 0;
}

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

vector<int>G[102];
int d[102],f[102];
bool vis[102];
int V;
int cur=0;
/*
void dfs(int id){
    cur++;
    d[id]=cur;
    vis[id]=true;
    for(int i=0;i<G[id].size();i++){
        if(!vis[G[id][i]])
            dfs(G[id][i]);
    }
    f[id]=cur;
}
*/
stack<int> s;
void dfs_visit(int id){
    s.push(id);
    cur++;
    d[id]=cur;
    while(!s.empty()){
        int u=s.top();
        int nex=-1;
        for(int i=0;i<G[u].size();i++){
            if(!vis[G[u][i]]) {
                nex=G[u][i];
                break;
            }
        }
        cur++;
        if(nex==-1){
            s.pop();
            f[u]=cur;
            vis[u]=true;
        }
        else{
            d[nex]=cur;
            s.push(nex);
        }
    }
}

void dfs(){
	int i;
    for(i=1;i<=V;i++){
        if(!vis[i]) dfs_visit(i);
    }
    for(i=1;i<=V;i++){
        cout<<i<<" "<<d[i]<<" "<<f[i]<<endl;
    }
}
int main(){
    cin>>V;
    memset(vis,false,sizeof(vis));
    for(int i=1;i<=V;i++){
        int id,k;
        cin>>id>>k;
        while(k--){
            int out;
            cin>>out;
            G[id].push_back(out);
        }
        sort(G[id].begin(),G[id].end());
    }
    dfs();
    return 0;
}