Go: package main

/*
深さ優先探索
*/

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"strconv"
	"strings"
)

func main() {
	scanner := makeScanner(8192)
	n := eGetInt(scanner)
	g := make([][]int, n+1)
	for i := 1; i < n+1; i++ {
		ints := eGetInts(scanner)
		num, vcount := ints[0], ints[1]
		g[i] = make([]int, vcount)
		for j := 0; j < vcount; j++ {
			g[num][j] = ints[j+2]
		}
	}
	hist := make([]struct{ d, f int }, n+1)
	t := 0
	var visit func(int)
	visit = func(num int) {
		if hist[num].d == 0 {
			stack := []int{}
			t++
			hist[num].d = t
			stack = append(stack, num)
			for len(stack) > 0 {
				// トップを訪問する
				top := stack[len(stack)-1]
				for i := 0; i < len(g[top]); i++ {
					if hist[g[top][i]].d == 0 {
						t++
						hist[g[top][i]].d = t
						stack = append(stack, g[top][i])
						goto endloop
					}
				}
				// 訪問場所がなくなったら
				// pop
				stack = stack[0 : len(stack)-1]
				t++
				hist[top].f = t
			endloop:
			}
		}
	}
	for i := 1; i < n+1; i++ {
		visit(i)
	}
	for i := 1; i < n+1; i++ {
		fmt.Println(i, hist[i].d, hist[i].f)
	}
}

////////////////////////////////////////////////////////////////////////////////
// ライブラリ
////////////////////////////////////////////////////////////////////////////////
func makeScanner(maxByte int) *bufio.Scanner {
	scanner := bufio.NewScanner(os.Stdin)
	scanner.Buffer(make([]uint8, 0, 8192), maxByte)
	return scanner
}
func makeWordScanner() *bufio.Scanner {
	scanner := makeScanner(8192)
	scanner.Split(bufio.ScanWords)
	return scanner
}
func eGetLine(r *bufio.Scanner) string {
	if r.Scan() {
		return r.Text()
	}
	err := r.Err()
	if err != nil {
		log.Fatal(err)
	}
	// EOF
	return ""
}
func eGetInt(r *bufio.Scanner) int {
	line := eGetLine(r)
	return eAtoi(line)
}
func eGetInt64(r *bufio.Scanner) int64 {
	line := eGetLine(r)
	return eAtoInt64(line)
}
func eGetFields(r *bufio.Scanner) []string {
	line := eGetLine(r)
	return strings.Fields(line)
}
func eGetInts(r *bufio.Scanner) []int {
	fields := eGetFields(r)
	ints := make([]int, len(fields))
	for i := 0; i < len(ints); i++ {
		ints[i] = eAtoi(fields[i])
	}
	return ints
}
func eGetInt64s(r *bufio.Scanner) []int64 {
	fields := eGetFields(r)
	ints := make([]int64, len(fields))
	for i := 0; i < len(ints); i++ {
		ints[i] = eAtoInt64(fields[i])
	}
	return ints
}
func eGetChars(r *bufio.Scanner) []string {
	line := eGetLine(r)
	return strings.Split(line, "")
}
func eAtoi(s string) int {
	n, err := strconv.Atoi(s)
	if err != nil {
		log.Fatal(err)
	}
	return n
}
func eAtoInt64(s string) int64 {
	n, err := strconv.ParseInt(s, 10, 64)
	if err != nil {
		log.Fatal(err)
	}
	return n
}

C++: #include<iostream>
#include<vector>
#include<stack>
#include<climits>

using namespace std;

class Node{
private:
 unsigned long nodeId;
 unsigned long timestampStart;
 unsigned long timestampFinish;
 vector<unsigned long> adjectNode;
 unsigned long checkedNodeNum;

 void stampStart(unsigned long time){
  timestampStart = time;
 };

 void stampFinish(unsigned long time){
  timestampFinish = time;
 };
 

public:
 Node(unsigned long nodeId = 0, unsigned long adjectNodenum = 0)
                  : nodeId(nodeId),
                    timestampStart(0),
                    timestampFinish(0),
                    adjectNode(vector<unsigned long>(adjectNodenum, 0)),
                    checkedNodeNum(0){

 for(unsigned long adjectNode_i = 0; adjectNode_i < adjectNodenum; ++adjectNode_i){
  unsigned long adjectNodeId = 0; cin >> adjectNodeId;

  adjectNode[adjectNode_i] = adjectNodeId;
 } 

 };

 unsigned long getNotCheckedAdjectNode(unsigned long time){
  unsigned long AdjectNodeMax = adjectNode.size();
  if(checkedNodeNum == 0){
   stampStart(time);
  }else if(checkedNodeNum >= AdjectNodeMax){
   stampFinish(time);
   return ULONG_MAX;
  }


  ++checkedNodeNum;

  if(AdjectNodeMax == 0){
   return nodeId;
  }

  return adjectNode[checkedNodeNum-1];

 };

 bool isChecked(){
  if(timestampStart != 0) return true;
  return false;
 }

 void display(){
  cout << nodeId          << " ";
  cout << timestampStart  << " ";
  cout << timestampFinish << endl;
 };


protected:
};

class Graph{
private:
 vector<Node*> graph;

public:
 Graph(unsigned long nodeNum = 0)
                  : graph(vector<Node*>(nodeNum, 0)){
  for(unsigned long node_i = 0; node_i < nodeNum; ++node_i){
   unsigned long nodeId = 0; cin >> nodeId;
   unsigned long adjectNodenum = 0; cin >> adjectNodenum;
   Node* temp_node = new Node(nodeId, adjectNodenum);
   graph[nodeId-1] = temp_node;
  }
 };

 void DepthFirstSearch(){
  unsigned long time = 1;
  stack<unsigned long> checkedNode;
  if(graph[0] == 0) return ;

  checkedNode.push(1);
  while(!checkedNode.empty()){
   unsigned long nowNode = checkedNode.top();
   if(unsigned long nextNode = graph[nowNode-1]->getNotCheckedAdjectNode(time)){
    if(nextNode == ULONG_MAX){
     checkedNode.pop();
    }else if(nextNode == nowNode){
    }else if(graph[nextNode-1]->isChecked()){
     continue;
    }else{
     checkedNode.push(nextNode);
    }
   }
   ++time;
  }

 };

 void display(){
  for(unsigned long node_i = 0, nodeNum = graph.size(); node_i < nodeNum; ++node_i){
   graph[node_i]->display();
  }
 };

protected:

};

int main(){
 unsigned long nodeNum = 0; cin >> nodeNum;

 Graph graph(nodeNum);
 graph.DepthFirstSearch();
 graph.display();

 return 0;
};

C++: // ALDS1_11_B
#include <iostream>
#include <vector>
using namespace std;

void DFS(vector<vector<int> > A, vector<int> &d, vector<int> &f, vector<int> &visit, int &t, int v){
	
	visit[v] = 1;
	d[v] = t++;

	for(int i=0;i<A[v].size();i++)
		if((A[v][i] == 1) && (visit[i] == 0))
			DFS(A, d, f, visit, t, i);

	f[v] = t++;
}

int main(){
	int n, u, k, t=1;
	vector<vector<int> > A;
	vector<int> d, f, visit;

	cin>>n;
	A.resize(n);
	d.resize(n);
	f.resize(n);
	for(int i=0;i<n;i++){
		A[i].resize(n);
		visit.push_back(0);
	}

	for(int i=0;i<n;i++)
		for(int j=0;j<n;j++)
			A[i][j] = 0;

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

	for(int i=0;i<n;i++)
		if(!visit[i])
			DFS(A, d, f, visit, t, i);
	
	for(int i=0;i<n;i++)
		cout<<i+1<<" "<<d[i]<<" "<<f[i]<<endl;

	return 0;
}