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<algorithm>
using namespace std;

int n;
int t = 0; //time
int d[110] = {}; //discover
int f[110]; //finish
bool a[110][110] = {}; //adjacency matrix

void dfs(int u){
  d[u] = ++t; //record the discovering time

  //if be adjoining and have not been discovered, search
  for(int i = 1;i <= n;i++) if(a[u][i] && d[i] == 0) dfs(i);
  
  f[u] = ++t; //record the finishing time
}

int main(){
  
  int u, k, v;

  //input
  cin >> n;
  for(int i = 0;i < n;i++){
    cin >> u >> k;
    for(int j = 0;j < k;j++){
      cin >> v;
      a[u][v] = true;
    }
  }

  for(int i = 1;i <= n;i++){
    for(int j = 1;j <= n;j++){
      //if be adjoining and have not been discovered, search
      if(a[i][j] && d[i] == 0) dfs(i);
    }
  }

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

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

class Graph {
protected:
	vector< vector<int> > adjl;
public:
	Graph(int n) : adjl(n){}
	void PushAdjl(int pl, int val) { adjl[pl].push_back(val); }
};

class DFGraph : public Graph {
private:
	int t;
	vector<int> d, f;
public:
	DFGraph(int n) : Graph(n), d(n), f(n) {}
	void DepthFirstSearch(int);
	void DFSSub(int);
	void Showdf();
};

void DFGraph::DepthFirstSearch(int begin = 0) {
	t = 1;
	DFSSub(begin);
	for (int i = 0; i < d.size(); i++)
		if (d[i] == 0)
			DFSSub(i);
}

void DFGraph::DFSSub(int v) {
	d[v] = t;
	t++;
	for (auto&& i : adjl[v])
		if (d[i] == 0)
			DFSSub(i);
	f[v] = t;
	t++;
}

void DFGraph::Showdf() {
	for (int i = 0; i < d.size(); i++)
		cout << i + 1 << " " << d[i] << " " << f[i] << endl;
}

int main() {
	int n;
	cin >> n;
	DFGraph dfg(n);
	for (int i = 0; i < n; i++) {
		int u, k;
		cin >> u >> k;
		for (int j = 0; j < k; j++) {
			int t;
			cin >> t;
			dfg.PushAdjl(u - 1, t - 1);
		}
	}
	dfg.DepthFirstSearch();
	dfg.Showdf();
}

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

int m[101][101];
int visit[101];
int d[101];
int f[101];
int n, t;

void dfs(int u){
  visit[u] = 1;
  d[u] = t;
  t++;
  
  for(int i = 0; i < n; ++i){
    if(m[u][i] == 1 && visit[i] == 0){
      dfs(i);
    }
  }

  f[u] = t;
  t++;
}

main()
{
  int 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){
    if(visit[i]==0){
      t=1;
      dfs(i);
    }
  }

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

  return (0);
}

C++: #include <iostream>
#include<stack>
#include<vector>
using namespace std;
int main(void){
    int n ,i,DP[1001][1001],num,p,k,f[101][3],ptr=1,v;
    stack<int> s;
        cin>>n;
    for(i=1;i<=n;i++){
        cin>>p>>k;
        for(int j=1;j<=k;j++){
            cin>> num;
            DP[i][num]=1;
        }
    }
    for(i=1;i<=n;i++){
        DP[0][i]=1;
    }
    s.push(0);
    while(!s.empty()){
        v=s.top();
        for(int i=1;i<=n;i++){
            if(DP[v][i]==1&&f[i][0]==0){
                    s.push(i);
                    f[i][0]=1;
                    f[i][1]=ptr;
                    goto Exit;
            }
        }
        s.pop();
        f[v][2]=ptr;
        Exit:;
        ptr++;
    }
    for(int i=0;i<n;i++){
        cout<<i+1<<" "<<f[i+1][1]<<" "<<f[i+1][2]<<endl;
    }
}

C++: #include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int n;
int t;
vector< vector<int> > A;
vector<int> c;
vector<int> d;
vector<int> f;

void dfsVisit(int u) {
    t++;
    d[u] = t;
    c[u] = 1;
    for(int i=0; i<A[u].size(); i++) {
        int v = A[u][i];
        if(c[v] == 0) dfsVisit(v);
    }
    t++;
    f[u] = t;
}

void dfs() {
    for(int u=0; u<n; u++) c[u] = 0;
    t = 0;
    for(int u=0; u<n; u++) {
        if(c[u] == 0) {
            dfsVisit(u);
        }
    }
}

int main() {
    cin >> n;
    A.resize(n);
    c.resize(n);
    d.resize(n);
    f.resize(n);

    for(int i=0; i<n; i++) {
        int u,k;
        cin >> u >> k;
        A[u-1].resize(k);
        for(int j=0; j<k; j++) {
            int v;
            cin >> v;
            A[u-1][j] = v-1;
        }
        sort(A[u-1].begin(), A[u-1].end());
    }

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

C++: #include <iostream>

using namespace std;

int adja[101][101];
int d[101], f[101], cnt;

void dfs(int u) {
    d[u] = ++cnt;
    for (int i = 0, v; (v = adja[u][i]) > 0; ++i) {
        if (v > 0)
            continue;
        dfs(v);
    }
    f[u] = ++cnt;
}

int main() {
    int n, k, u;
    cin >> n;
    for (int i = 0; i < n; ++i) {
        cin >> u >> k;
        for (int j = 0; j < k; ++j) {
            cin >> adja[u][j];
        }
    }
    for (int i = 1; i <= n; ++i) {
        if (d[i] == 0)
            dfs(i);
        cout << i << " " << d[i] << " " << f[i] << endl;
    }

    return 0;
}