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>
using namespace std;

const int MAX_N = 110;
int G[MAX_N][MAX_N];
int D[MAX_N], F[MAX_N], V[MAX_N];

void dfs(int u, int n, int& count) {
  int i;
  V[u] = 1;
  D[u] = ++count;
  for (i = 0; i < n; ++i) {
    if (G[u][i] && !V[i]) {
      dfs(i, n, count);
    }
  }
  F[u] = ++count;
}

int main() {
  int i, j, u, k, v, n, count;
  
  cin >> n;

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

  count = 0;
  for (i = 0; i < n; ++i) {
    if (!V[i]) dfs(i,n,count);
  }

  for (i = 0; i < n; ++i) {
    cout << i + 1 << ' ' << D[i] << ' ' << F[i] << '\n';
  }

  return 0;
}

C++: #include <bits/stdc++.h>
#define MAX 105
#define INF (1<<30)
//#define EZPZ_LEMON_SQUEENZ
using namespace std;

vector<int> M[MAX];
stack<int> s;
int states[MAX][2];
bool vis[MAX];
int n, t;

void dfs(int index)
{
	if (index == n + 1) return;
	vis[index] = true;
	for (int i = 0; i < M[index].size(); i++)
	{
		if (!vis[M[index][i]]) {
			states[M[index][i]][0] = t++;
			dfs(M[index][i]);
			states[M[index][i]][1] = t++;
		}
	}
}

int main()
{
#ifdef EZPZ_LEMON_SQUEENZ
	freopen("D:\\in.txt", "r", stdin);
	freopen("D:\\out.txt", "w", stdout);
#endif
	ios::sync_with_stdio(false);
	cin >> n;
	for (int i = 1; i <= n; i++) {
		int b, nn, e;
		cin >> b >> nn;
		for (int j = 1; j <= nn; j++) {
			cin >> e;
			M[b].push_back(e);
		}
	}
	t = 1;
	for (int i = 1; i <= n; i++)
	{
		if (!vis[i]) {
			states[i][0] = t++;
			dfs(i);
			states[i][1] = t++;
		}
	}
	for (int i = 1; i <= n; i++) cout << i << " " << states[i][0] << " " << states[i][1] << endl;
	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> P;
typedef pair<ll, ll> Pll;
#define debug(var)  do{std::cout << #var << " : ";view(var);}while(0)
template<typename T> void view(T e){std::cout << e << std::endl;}
template<typename T> void view(const std::vector<T>& v){for(const auto& e : v){ std::cout << e << " "; } std::cout << std::endl;}
template<typename T> void view(const std::vector<std::vector<T> >& vv){ for(const auto& v : vv){ view(v); } }
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

const int MOD = 1000000007;
const int INF = 1e9;

const int mod = 1000000007;
const int inf = 1e9;
#define PI acos(-1);
int dx[4] = {1,-1,0,0};
int dy[4] = {0,0,1,-1};
int ddx[8] = {1,1,1,-1,-1,-1,0,0};
int ddy[8] = {0,1,-1,0,1,-1,1,-1};

const int mxN = 102;
vector<int> adj[mxN], in(mxN, -1), out(mxN, -1);
int t = 0;

void dfs(int i) {
    t++;
    in[i] = t;
    for(auto v: adj[i]) {
        if(in[v]==-1) {
            dfs(v);
        }
    }
    t++;
    out[i] = t;
}

int main(){
    int n;
    cin >> n;
    for(int i = 0; i < n; i++) {
        int v, k;
        cin >> v >> k;
        for(int j = 0; j < k; j++) {
            int a;
            cin >> a;
            a--;
            adj[i].push_back(a);
        }
    }
    for(int i = 0; i < n; i++) {
        if(in[i] == -1) dfs(i);
    }
    for(int i = 0; i < n; i++) {
        cout << i+1 << " " << in[i] << " " << out[i] << endl;
    }
}

C++: #include <iostream>
#include <unordered_map>
#include <vector>


using namespace std;

int timecount = 0;

void dfs(int cur, int u, bool* visited, int* timearray, int* timearray_end, unordered_map<int, vector<int> > mymap);

int main(){
  int u, i, id, k, j;
  cin >> u;
  unordered_map<int, vector<int> > mymap;

  for (i = 0; i < u; ++i){
    cin >> id >> k;
    vector<int> points;
    for (j = 0; j < k; ++j){
      int a;
      cin >> a;
      points.push_back(a);
    }
    mymap[id] = points;
  }
  
  bool visited[u+1];
  for (j = 1; j <= u; ++j){
    visited[j] = false;
  }
  visited[1] = true;

  int timearray[u+1];
  for (j = 1; j <= u; ++j){
    timearray[j] = 0;
  }
  int timearray_end[u+1];
  for (j = 1; j <= u; ++j){
    timearray_end[j] = 0;
  }

  dfs(1, u, visited, timearray, timearray_end, mymap);

  for (j = 1; j <= u; ++j){
    cout << j << " " << timearray[j] << " " << timearray_end[j]<< endl;
  }

}

void dfs(int cur, int u, bool* visited, int* timearray, int* timearray_end, unordered_map<int, vector<int> > mymap){
  timecount++;
  timearray[cur] = timecount;

  for(int i = 1; i <= u; ++i){
    
    if((i!=cur)&&(find(mymap[cur].begin(), mymap[cur].end(), i) != mymap[cur].end())&&(!visited[i])){
      visited[i] = true;
      dfs(i, u, visited, timearray, timearray_end, mymap);
    }
  }
  timecount++;

  timearray_end[cur] = timecount;
}