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<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<iostream>
using namespace std;

#define N_MAX 100

typedef struct _v {
    int k;
    int *v;
    int f;
    int l;
} Vertex;
Vertex Adj[N_MAX];

int t = 0;

void depth_search(int i) {
//    printf(" i %d\n", t);
    if (Adj[i].f == 0) {
        Adj[i].f = t;
//        printf("  Adj[%d] : k = %d f = %d\n", i, Adj[i].k, t);
    }
    else {
        t--;
        return;
    }

    for (int j = 0; j < Adj[i].k; j++) {
        t++;
//        printf("t:%d\n", t);
        depth_search(Adj[i].v[j]);
    }
    t++;
//    printf("t:%d\n", t);
    Adj[i].l = t;
//    printf(" Adj[%d].l = %d\n", i, Adj[i].l);
    return;
}

int main() {
    int n;

    cin >> n;

    for (int i = 0; i < n; i++) {
        int k;
        cin >> k >> k;
        Adj[i].k = k;
        Adj[i].v = new int[k];
        for (int j = 0; j < k; j++) {
            int v;
            cin >> v;
            Adj[i].v[j] = v - 1;
        }
        Adj[i].f = 0;
        Adj[i].l = 0;
    }

    for (int i = 0; i < n; i++) {
        t++;
        depth_search(i);
        cout << i + 1 << " " << Adj[i].f << " " << Adj[i].l << endl;
    }

    return 0;
}

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

const int MAX = 110;
int mat[MAX][MAX];
int d[MAX], f[MAX];
int n, t;

void dfs(int i)
{
  if (d[i] != -1) return;
  d[i] = ++t;
  for (int j = 0; j < n; j++)
    if (mat[i][j])
      dfs(j);
  f[i] = ++t;
}

int main()
{
  cin >> n;
  memset(mat, 0, sizeof(mat));
  for (int i = 0; i < n; i++) {
    int u; cin >> u; u--;
    int k; cin >> k;
    for (int j = 0; j < k; j++) {
      int v; cin >> v; v--;
      mat[u][v] = 1;
    }
  }
  memset(d, -1, sizeof(d));
  t = 0;
  for (int i = 0; i < n; i++)
    dfs(i);

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

C++: #include <bits/stdc++.h>

#define fp 				pop_front
#define bp 				pop_back
#define all(x) 			x.begin() , x.end()
#define mp 				make_pair
#define pb 				push_back
#define pf 				push_front
#define se 				second
#define f 				first
#define sz 				size()
#define sqr(x) 			((x) * (x))
#define cub(x) 			sqr(x) * (x)
#define ios 			std::ios_base::sync_with_stdio(false); std::cin.tie(0); std::cout.tie(0);
#define y1 				qazwsxedcrfvtgb
#define LOGMAX          17
#define MX              1 << 22
#define l(n)            n << 1
#define r(n)            (n << 1) + 1
#define FIND(N,pos)     ((N) & (1 << (pos)))
#define sf(h)           scanf("%d",&h)
#define sff(h,b)        scanf("%d%d",&h,&b)
#define sfff(h,b,c)     scanf("%d%d%d",&h,&b,&c)
#define TCASE(test)     for(int z = 1;z <= test;z++)
#define PRINT           printf("Case %d: ",z)
#define en              "\n"
#define lwb             lower_bound
#define upb             upper_bound
#define	pii				pair <int, int>
#define	pil				pair <int, long long>
#define	pli				pair <long long, int>
#define	pll				pair <long long, long long>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;

const int maxn = int(1.5 * 1e7);
const int inf = 1e9 + 7;
const ll ll_inf = 1e18 + 420;
const double eps = 1e-4;
const int N = 1e6 + 7;
const int MAX = 2e5 + 9;

int n, x, y, k1, t, a[101][101], st[101], ft[101], was[101];
vector <int> v[101];

void dfs(int k){
	st[k] = ++t;
	was[k] = 1;
	for(int i = 0; i < v[k].sz; ++i){
		int to = v[k][i];
		if(!was[to]){
			dfs(to);
		}
	}
	ft[k] = ++t;
}

main(){
	cin >> n;
	for(int i = 0; i < n; ++i){
		cin >> x >> k1;
		for(int j = 0; j < k1; ++j){
			cin >> y;
			v[x].pb(y);
		}
	}
	dfs(1);
	for(int i = 1; i <= n; ++i){
		cout << i << " " << st[i] << " " << ft[i] << en;
	}
}

C++: 
#include<stdio.h>
#include<stack>

#define MAX 100

enum SATE {
    NOT_VISIT,
    DISCOVER,
    FOUND
};

int G[MAX+1][MAX+1], d[MAX+1], f[MAX+1], STATE[MAX+1];
int n, tt;
std::stack<int> S;

void dfs(int i) {
    S.push(i);
    STATE[i] = DISCOVER;
    d[i] = ++tt;

    for (int j = 1; j <= n; ++j) {
        if (G[i][j] != 1 || STATE[j] != NOT_VISIT) continue;
        dfs(j);
    }
    STATE[i] = FOUND;
    f[i] = ++tt;
}

int main() {
    scanf("%d", &n);
    for (int i = 1; i <= n; ++i) {
        d[i] = f[i] = 0;
        STATE[i] = NOT_VISIT;
        for (int j = 1; j <= n; ++j) {
            G[i][j] = 0;
        }
    }
    for (int i = 0; i < n; ++i) {
        int u,k;
        scanf("%d %d", &u, &k);
        for (int j = 0; j < k; ++j) {
            int t;
            scanf("%d", &t);
            G[u][t] = 1;
        }
    }

    tt = 0;
    for (int i = 1; i <= n; ++i) {
        if (STATE[i] == NOT_VISIT) dfs(i);
    }
    for (int i = 1; i <= n; ++i) {
        printf("%d %d %d\n", i, d[i], f[i]);
    }

}