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 <stack>
#include <vector>

using namespace std;

int n;
int G[105][105];
vector<int> d(105,0),f(105,0);
int t=0;

void dfs(int x){
    bool p = false;
    if(d[x]!=0) p = true;
    if(d[x]==0){
        t++;
        d[x]=t;
    }
    for (int j=1; j<=n; j++) {
        if (G[x-1][j-1]==1 and d[j]==0) {
            dfs(j);
        }
    }
    t++;
    if(p) t--;
    if(f[x]==0) f[x]=t;
}


int main(){
    cin >> n;
    for (int i =0; i<n; i++) {
        for (int j =0; j<n; j++) {
            G[i][j] = 0;
        }
    }
    for (int i=0;i<n;i++) {
        int p,m;
        cin >>p >> m;
        for (int j=0; j<m; j++) {
            int q;
            cin >> q;
            G[p-1][q-1]=1;
        }
    }
    for(int i=0;i<n;i++) {
        dfs(i+1);
    }
    for (int i=0; i<n; i++) {
        cout << i+1 << " "<<d[i+1]<<" "<<f[i+1]<<endl;
    }
}

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

void dfs(int n, int &t, vector< vector<int> >& g, vector<int>& d, vector<int>& f, vector<bool>& seen)
{
    t++;
    if (d[n] == 0) d[n] = t;
    seen[n] = true;
    for (int i = 0; i < g[n].size(); i++)
    {
        if (seen[g[n][i]]) continue;
        dfs(g[n][i], t, g, d, f, seen);
    }
    t++;
    f[n] = t;
}

int main()
{
    int n; cin >> n;
    vector< vector<int> > g(n, vector<int>());
    for (int i = 0; i < n; i++)
    {
        int u, k; cin >> u >> k; u--;
        for (int j = 0; j < k; j++)
        {
            int v; cin >> v; v--;
            g[u].push_back(v);
        }
    } 
    vector<int> d(n, 0);
    vector<int> f(n, 0);
    vector<bool> seen(n, false);
    int t = 0;
    for (int i = 0; i < n; i++)
        if (seen[i] == false)
            dfs(i, t, g, d, f, seen);
    for (int i = 0; i < n; i++)
    {
        cout << i + 1 << " " <<  d[i] << " " << f[i] << endl;
    }
}

C++: #include<iostream>
#include<cstdio>
#define M 100
#define G -1
#define B -2
#define W 0
using namespace std;

int n,T = 0;
int A[M+1][M+1],t[M+1][2],color[M+1];

void white(){
    for(int i = 0; i <= n;i++) color[i] = W;
}

void DFS(int x){
    T++;
    color[x] = G;
    t[x][1] = T;
    for(int i = 1; i <= n; i++){
        if(A[x][i] == 0) continue;
        else if(color[i] == W){
            DFS(i);
        }
    }
    T ++;
    color[x] = B;
    t[x][2] = T; 
}

int main(){
    int u,k,v;
    scanf("%d",&n);
    for(int i = 0; i <= n; i++){
        for(int j =0 ; j <= n; j++) A[i][j] = 0;
    }
    for(int i = 1; i <= n; i++){
        scanf("%d %d",&u,&k);
        for(int j = 0; j < k; j++){
            scanf("%d",&v);
            A[u][v] = 1;
        }
    }
    
    white();
    for(int i = 1; i <= n; i ++){
        if(color[i] == W) DFS(i);
    }
    
    for(int i = 1; i <= n; i++) printf("%d %d %d\n",i,t[i][1],t[i][2]);
    
    return 0;
}

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

const int N = 100;
int M[N][N];
int n;
int t;
int color[N];
int d[N], f[N];

void init(){
  for(int i=0;i<n;i++){
    color[i] = 0;
  }
}

void dfs(int x){
  color[x] = 1;
  d[x] = ++t;
  for(int i=0;i<n;i++){
    if(M[x][i] == 1 && color[i] == 0){
      dfs(i);
    }
  }
  color[x] = 2;
  f[x] = ++t;
}

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

C++: #include <iostream>

using namespace std;

#define N_MAX 100

int Adj[N_MAX][N_MAX] = {};
int Chk[N_MAX][2] = {};
int search_time = 1;

void dfs(int v, int num_node);

int main()
{
    int n, i, u, k, v, j;

    cin >> n;

    //??£??\???????????????
    for (i = 0; i < n; i++) {
        cin >> u >> k;
        while (k-- > 0) {
            cin >> v;
            Adj[u-1][v-1] = 1;
        }
    }
/*
    cout << "show Adjacency matrix" << endl;
    for (i = 0; i < n; i++) {
        for (j = 0; j < n ; j++) {
            if (j == n - 1)
                cout << Adj[i][j] << endl;
            else
                cout << Adj[i][j] << ' ';
        }
    }
*/
    //??¢?´¢??????
    dfs(1, n);

    for(i = 0; i < n; i++) {
        cout << i+1 << ' ' << Chk[i][0] << ' ' << Chk[i][1] << ' ' <<  endl;
    }

    return 0;
}

void dfs(int v, int num_node) {

//    cout << "dfs node : " << v << " time : " << search_time << endl;

    int i;
    //v???????????????????¨????
    if (Chk[v-1][0] == 0) //????????????node?????´???
        Chk[v-1][0] = search_time++;
    else {                //??¢??\???node?????´???
    //    search_time++;
        return;
    }

    //v???????????¢?´¢
    for (i = 1; i <= num_node; i++) {
        if (Adj[v-1][i -1] == 1) {
            dfs(i, num_node);
        }
    }

    //?????±??¨?????§??¢?´¢??????????????????
    //v???????????????????¨????
    Chk[v-1][1] = search_time++;
}