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 <cstdio>
#include <vector>
#define N 100
typedef struct SearchTime SearchTime;

struct SearchTime{
    int find = -1;
    int comp = -1;
    bool flag = false;
    void print(){
        std::cout << find << " " << comp << '\n';
    }
};

int cnt = 1;
int A[N][N];
SearchTime st[N];

void input_graph(std::vector<std::vector<int> >& Adj, int n){
    int u, k, v;
    for(int i=0; i<n; i++){
        std::cin >> u >> k;
        for(int j=0; j<k; j++){
            std::cin >> v;
            Adj[u-1].push_back(v);
        }
    }
}

void input_A(std::vector<std::vector<int> >& Adj, int n){
    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++){
        int len = Adj[i].size();
        for(int j=0; j<len; j++){
            A[i][Adj[i][j]-1] = 1;
            A[Adj[i][j]-1][i] = -1;
        }
    }
}

void output_A(int n){
    for(int i=0; i<n; i++){
        for(int j=0; j<n; j++){
            if(j+1==n)  printf("%3d\n", A[i][j]);
            else        printf("%3d", A[i][j]);
        }
    }
}

void result(int n){
    for(int i=0; i<n; i++){
        std::cout << i+1 << " ";
        st[i].print();
    }
}

void DFS(std::vector<std::vector<int> >& Adj, int n){
    int i = 0;
    int j;
    int nexti;              //毎回-1する.
    std::vector<int> tmp;   //軌跡を保存
    //深さ優先探索
    while(cnt <= n*2){
        //下層へ探索
        //std::cout << "\nstrat\n";
        while(i != -1){
            st[i].flag = true;
            st[i].find = cnt;
            cnt++;
            //std::cout << "cnt:" << cnt-1 << '\n';
            tmp.push_back(i);
            //std::cout << "tmp.size():" << tmp.size() << '\n';
            //std::cout << "i:" << i+1 << '\n';
            //次の葉を探す
            if((int)Adj[i].size() != 0){//葉が最深でないとき
                j = 0;
                nexti = Adj[i][j]-1;
                while(st[nexti].flag){
                    j++;
                    if(j == (int)Adj[i].size()){//もし葉がすべて探索済みなら
                        st[i].comp = cnt;
                        cnt++;
                        //std::cout << "tochu\n";
                        //std::cout << "cnt:" << cnt-1 << '\n';
                        i = -1; //2つ目のwhile文抜ける
                        break;
                    }
                    nexti = Adj[i][j]-1;
                }
                if(i != -1) i = nexti;
            }
            else{//葉が最深のとき
                st[i].comp = cnt;
                cnt++;
                i = -1; //2つ目のwhile文抜ける
                //std::cout << "saishin\n";
                //std::cout << "cnt:" << cnt-1 << '\n';
                //std::cout << "tmp.size():" << tmp.size() << '\n';
                //std::cout << "i:" << i << '\n';
            }
        }
        //ここから根に向かって戻る. 未探索の葉があればそちらへ行く
        //std::cout << "\nback\n";
        tmp.pop_back();
        i = (int)tmp.back();
        tmp.pop_back();
        //std::cout << "tmp.size():" << tmp.size() << '\n';
        //std::cout << "i:" << i+1 << '\n';
        j = 0;
        nexti = Adj[i][j]-1;
        while(st[nexti].flag){
            j++;
            if(j == (int)Adj[i].size()){//現在のノードから未探索の葉がない
                if((int)tmp.size() != 0){//まだtmpに軌跡が残っていれば
                    st[i].comp = cnt;
                    cnt++;
                    //std::cout << "cnt:" << cnt-1 << '\n';
                    i = (int)tmp.back();
                    tmp.pop_back();
                    //std::cout << "tmp.size():" << tmp.size() << '\n';
                    //std::cout << "i:" << i+1 << '\n';
                    j = 0;
                    nexti = Adj[i][j]-1;
                }
                else{//残っていないなら
                    st[i].comp = cnt;
                    cnt++;      //たぶんこれで終わる
                    //std::cout << "cnt:" << cnt-1 << '\n';
                    break;
                }
            }
            else{
                nexti = Adj[i][j]-1;
            }
        }
        tmp.push_back(i);
        i = nexti;
    }
}


int main(){
    int n;
    std::cin >> n;
    std::vector<std::vector<int> > Adj;
    Adj.resize(n);
    input_graph(Adj, n);
    //input_A(Adj, n);
    //output_A(n);
    DFS(Adj, n);
    result(n);
    return 0;
}