Go: package main

import (
	"bufio"
	"fmt"
	"io"
	"os"
	"strconv"
)

const (
	initialBufSize = 100000
	maxBufSize     = 1000000
)

var sc *bufio.Scanner

func initScanner(r io.Reader) *bufio.Scanner {
	buf := make([]byte, initialBufSize)

	sc := bufio.NewScanner(r)
	sc.Buffer(buf, maxBufSize)
	sc.Split(bufio.ScanWords) // bufio.ScanLines
	return sc
}

func main() {
	sc = initScanner(os.Stdin)
	resolve(parseProblem())
}

type graph struct {
	size  int
	edges [][]int
}

func parseProblem() *graph {
	n := scanInt(sc)
	g := &graph{
		size:  n,
		edges: make([][]int, n),
	}
	for i := 0; i < g.size; i++ {
		_ = scanInt(sc)
		k := scanInt(sc)
		g.edges[i] = make([]int, k)
		for j := 0; j < k; j++ {
			g.edges[i][j] = scanInt(sc) - 1
		}
	}
	return g
}

func resolve(g *graph) {
	ds := make([]int, g.size)
	fs := make([]int, g.size)
	time := 0
	for i := 0; i < len(ds); i++ {
		if ds[i] == 0 {
			time++
			time = _dfs(ds, fs, time, g, i)
		}
	}
	for i := 0; i < len(ds); i++ {
		fmt.Println(i+1, ds[i], fs[i])
	}
	return
}

func _dfs(ds, fs []int, time int, g *graph, idx int) int {
	ds[idx] = time
	for _, next := range g.edges[idx] {
		if ds[next] > 0 {
			continue
		}
		time++
		time = _dfs(ds, fs, time, g, next)
	}
	time++
	fs[idx] = time
	return time
}

// snip-scan-funcs
func scanInt(sc *bufio.Scanner) int {
	sc.Scan()
	i, _ := strconv.Atoi(sc.Text())
	return int(i)
}
func scanString(sc *bufio.Scanner) string {
	sc.Scan()
	return sc.Text()
}

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

using namespace std;

static const int N = 100;

static const int WHITE = 0;

static const int GRAY = 1;

static const int BLACK = 2;




//用递归的方式实现图深度优先搜索


/**
 * color 标记访问状态的数组，
 * M[N][N] 邻接矩阵 如果存在定点i到顶点j的边，则M[i][j]=trul
**/
int n, M[N][N];
int color[N], d[N], f[N], tt;

void dfs(int u) {
    int v;
    color[u] = GRAY;

    d[u] = ++tt;

    for (v = 0; v < n; v++) {
        if (M[u][v] == 0)
            continue;
        if (color[v] == WHITE) {
            dfs(v);
        }
    }
    color[u] = BLACK;
    f[u] = ++tt;
}

void dfs() {
    int u;
    for (u = 0; u < n; u++) {
        if (color[u] == WHITE) {
            dfs(u);
        }
    }

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

int main() {
    int u, k, v;
    cin >> n;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            M[i][j] = 0;
        }
    }
    for (int i = 0; i < n; i++) {
        cin >> u >> k;
        u--;
        for (int i = 0; i < k; i++) {
            cin >> v;
            v--;
            M[u][v] = 1;
        }
    }
    dfs();
    return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int n,t;
int d[100],f[100];
bool graph[100][100];

void dfs(int v){
    t++;
    d[v]=t;

    for(int v2=0; v2<n; v2++){
        if(graph[v][v2]) dfs(v2);
    }

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

int main(void){
    cin >> n;
    t=0;

    for(int i=0; i<n; i++){
        for(int j=0; j<n; j++){
            graph[i][j]=false;
        }
    }
    for(int i=0; i<n; i++){
        int v,k; cin >> v >> k;
        for(int j=0; j<k; j++){
            int w; cin >> w;
            graph[v-1][w-1]=true;
        }
    }

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


}

C++: #include<iostream>
#include<stack>
using namespace std;
static const int N = 100;
static const int WHITE = 0;
static const int GRAY = 1;
static const int BLACK = 2;

int n, tt;
int M[N][N], color[N], d[N], f[N], nt[N]; 

int next(int u){
	for(int v = nt[u]; v < n; v++) {
		nt[u] = v + 1;
		if(M[u][v] == 1) return v;
	}
	return -1;
}

void dfs_visit(int r) {
    for(int i = 0; i < n; i++) {
        nt[i] = 0;
	}
	stack<int> S;
	S.push(r);
	color[r] = GRAY;
	d[r] = ++tt;
	while(!S.empty()) {
		int u = S.top();
		int v = next(u);
		if(v != -1) {
			if(color[v] == WHITE) {
			   color[v] = GRAY;
			   d[v] = ++tt;
			   S.push(v); 	
			}
		} else {
		   color[u] = BLACK;
		   S.pop();
		   f[u] = ++tt;
		}
	} 
}


void dfs() {
	for(int i = 0; i < n; i++) {
	     color[i] = WHITE;
	}	
	for(int u = 0; u < n; u++) {
		if(color[u] == WHITE) dfs_visit(u);
	}
	for(int i = 0; i < n; i++) {
		cout << i + 1 << " " << d[i] << " " << f[i] << endl;	
	}
}

int main() {
	int n, k , u, v;
	tt = 0;
	cin >> n;
	for(int i = 0; i < n; i++) {
		for(int j = 0; j < n; j++) {
			M[i][j] = 0;
		}
	}
	cin >> k >> u;
	u--;
	for(int i = 0; i < k; i++) {
	    cin >> v;
	    v--;
		M[u][v] = 1; 
	}
	dfs();
	return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;
int a[101][101];
int n;
int tt;
int color[101];
int nt[101];
int d[101],p[101];

int next(int u){
	for(int v=nt[u];v<n;v++){
		nt[u]=v+1;
		if(a[u][v])return v;
	}
	return -1;
}

void dfs_visit(int r){
	memset(nt,0,sizeof(nt));
	d[r]=++tt;
	color[r]=1;
	stack<int >s;
	s.push(r);
	while(!s.empty()){
		int u=s.top();
		int v=next(u);
		if(v!=-1){
			if(color[v]==0){
				d[v]=++tt;
				color[v]=1;
				s.push(v);
			}
		}
		else{
			s.pop();
			color[u]=2;
			p[u]=++tt;
		}
	}
}

void dfs(){
	int u;
	tt=0;
	for(u=0;u<n;u++)color[u]=0;
	for(u=0;u<n;u++){
		if(color[u]==0)dfs_visit(u);
	}
	for(u=0;u<n;u++)
	cout<<u+1<<" "<<d[u]<<" "<<p[u]<<endl;
}

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

C++: #include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<math.h>
#include<stack>
#include<queue>
#include<vector>
#include<algorithm>
#include<string>
#include<iostream>
using namespace std;
static const int N=105;
int M[N+1][N+1];
void graph(int n){
    for(int i=1;i<=n;i++)M[0][i]=1;
    for(int i=1;i<=n;i++){
        int garbage;cin>>garbage;
        int k;cin>>k;
        for(int j=1;j<=k;j++){
            int l;cin>>l;
            M[i][l]=1;
        }
    }
}
int d[N],f[N],t=0,n;
stack <int>S;
void dfs(){
    S.push(0);
    while(S.empty()!=true){
        int flag=0,i=1;
        while(flag==0 && i<=n){
            if(M[S.top()][i]==0){
                i++;
            }else{
                    flag++;
                for(int z=0;z<=n;z++) M[z][i]=0;
            }
        }
        t++;
        if(i>=n+1){
            f[S.top()]=t;
            S.pop();
        }else{
            S.push(i);
            d[i]=t;
        }
    }
}

int main(){
    cin>>n;
    graph(n);
    dfs();
    for(int i=1;i<=n;i++){
        cout<<i<<" "<<d[i]<<" "<<f[i]<<endl;
    }
    
    return 0;
}