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<bits/stdc++.h>
using namespace std;
int n;
vector<vector<int>> G;
vector<bool> seen;
vector<int> d,f;
void DFS(int v,int& time){
    d[v]=time++;
    seen[v]=1;
    for(auto p:G[v]){
        if(seen[p])continue;
        DFS(p,time);
    }
    f[v]=time++;
}
int main(){
    scanf("%d",&n);
    seen=vector<bool>(n);
    d=f=vector<int>(n);
    G=vector<vector<int>>(n,vector<int>());
    for(int i=0;i<n;i++){
        int v,k;scanf("%d%d",&v,&k);
        for(int j=0;j<k;j++){
            int a;scanf("%d",&a);
            G[v-1].push_back(a-1);
        }
    }
    for(int i=0;i<n;i++) sort(G[i].begin(),G[i].end());
    int time=1;
    for(int i=0;i<n;i++){
        if(!seen[i])DFS(i,time);
    }
    for(int i=0;i<n;i++){
        printf("%d %d %d\n",i+1,d[i],f[i]);
    }
    return 0;
}

C++: #include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cstring>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <list>
#include <utility>
#include <ctime>
#define INF 1000000000
#define LINF 9000000000000000000
#define mod 1000000007
 
#define rep(i,n) for(int i=0;i<int(n);i++)
#define rrep(i,n) for(int i=(n);i>=0;i--)
#define REP(i,a,b) for(int i=(a);i<int(b);i++)
#define all(x) (x).begin(),x.end()
#define vector_rsort(x) sort(all(x));reverse(all(x))
#define array_rsort(x,n) sort(x,x+n);reverse(x,x+n);
#define pb push_back
#define mp make_pair
#define MOD(x) (x%(mod))

#define Yes cout<<"Yes"<<endl
#define YES cout<<"YES"<<endl
#define No cout<<"No"<<endl
#define NO cout<<"NO"<<endl
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> vi;
typedef pair<int,int> pi;
 
int dx[4]={1,0,-1,0};
int dy[4]={0,1,0,-1};
bool debug=false;
/*---------------------------------------------------*/

int n,t=1;
int d[105],f[105];
int used[105];
vi g[105];

void init(){
  rep(i,105){
    d[i]=f[i]=INF;
  }
}

void dfs(int now){
  d[now]=min(d[now],t);
  rep(i,g[now].size()){
    if(!used[g[now][i]]){
      used[g[now][i]]=true;
      t++;
      dfs(g[now][i]);
    }
  }
  t++;
  f[now]=min(f[now],t);
}

int main(){
  int u,k,v;
  cin>>n;
  rep(i,n){
    cin>>u>>k;
    rep(j,k){
      cin>>v;
      g[u].pb(v);
    }
  }
  init();
  REP(i,1,n+1)dfs(i);
  REP(i,1,n+1){
    cout<<i<<" "<<d[i]<<" "<<f[i]<<endl;
  }
  return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;
int a[105][105];
pair<int,int> ans[105];
int co;
int n;
void dfs(int x){
  if(ans[x].first==0){
    co++;
    ans[x].first = co ;
  }
  else return;
  //cout << n << endl;
  for(int i=1;i<=n;i++){
    //cout << a[x][i]<<endl;
    if(a[x][i]==1)dfs(i);
  }
  if(ans[x].second==0){
    co++;
    ans[x].second=co;
  }
}

int main(){
  cin >> n;
  for(int i=0;i<n;i++){
    int u,m;
    cin >> u >> m;
    for(int j=0;j<m;j++){
      int v;
      cin >> v;
      a[u][v]=1;
    }
  }
  for(int i=1;i<=n;i++){
    dfs(i);
  }
  for(int i=1;i<=n;i++){
    cout << i << " " << ans[i].first << " "<< ans[i].second << endl;
  }
  return 0;
}

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

/* constant */

const int MAX_N = 100;

/* typedef */

typedef vector<int> vi;

/* global variables */

vi nbrs[MAX_N];
int ds[MAX_N], fs[MAX_N];

/* subroutines */

int dfs(int u, int t) {
  ds[u] = ++t;

  for (int i = 0; i < nbrs[u].size(); i++) {
    int &v = nbrs[u][i];
    if (! ds[v]) t = dfs(v, t);
  }

  return (fs[u] = ++t);
}

/* main */

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

  for (int i = 0; i < n; i++) {
    int u, k;
    cin >> u >> k;
    u--;

    for (int j = 0; j < k; j++) {
      int v;
      cin >> v;
      v--;
      nbrs[u].push_back(v);
    }
  }

  int t = 0;
  for (int i = 0; i < n; i++)
    if (! ds[i]) t = dfs(i, t);

  for (int i = 0; i < n; i++)
    printf("%d %d %d\n", i + 1, ds[i], fs[i]);

  return 0;
}

C++: #include<iostream>
#include<cstdio>
#define N 101
using namespace std;

int g[N][N]; 
int d[N];
int f[N];
int n;
int times=0;
bool us[N];

//dfs
void dfs(int x){
  
  times++;
  d[x]=times;

  for(int i=1;i<=n;i++){
    if(g[x][i]==1 &&us[i]==false){
      us[i]=true;
      // cout <<"i "<<i<<endl;
      dfs(i);
    }
  } 
  f[x]=times=times+1;

}


int main(){
  
  int n2,data,u;

  //load n
  cin >>n;
  
  //initialize
  for(int i=0;i<N;i++){
    us[i]=false;
    for(int j=0;j<N;j++){
      g[i][j]=0;
    }
  }
  
  //load data
  for(int i=0;i<n;i++){
    scanf("%d%d",&u,&n2);
    for(int j=0;j<n2;j++){
      scanf("%d",&data);
      g[u][data]=1;
    }
  }
  
  //execute
  dfs(1);

  //print
  for(int i=1;i<=n;i++){
    printf("%d %d %d\n",i,d[i],f[i]);
  }
  
  return 0;
}