Go: package main

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

const N = 100

const (
	WHITE = iota
	GRAY
	BLACK
)

type Graph struct {
	M               [N][N]int
	color, d, f, nt [N]int
	tt              int
}

func (g *Graph) next(u, n int) int {
	for v := g.nt[u]; v < n; v++ {
		g.nt[u] = v + 1
		if g.M[u][v] != 0 {
			return v
		}
	}
	return -1
}

func (g *Graph) dfsVisit(r, n int) {
	var S []int
	S = append([]int{r}, S...)
	g.color[r] = GRAY
	g.tt++
	g.d[r] = g.tt

	for len(S) != 0 {
		u := S[0]
		v := g.next(u, n)
		if v == -1 {
			S = S[1:]
			g.color[u] = BLACK
			g.tt++
			g.f[u] = g.tt
			continue
		}

		if g.color[v] != WHITE {
			continue
		}

		g.color[v] = GRAY
		g.tt++
		g.d[v] = g.tt
		S = append([]int{v}, S...)
	}
}

func (g *Graph) dfs(n int) string {
	for i := 0; i < n; i++ {
		g.color[i] = WHITE
	}
	g.tt = 0

	for u := 0; u < n; u++ {
		if g.color[u] == WHITE {
			g.dfsVisit(u, n)
		}
	}

	var out bytes.Buffer
	for i := 0; i < n; i++ {
		out.WriteString(fmt.Sprintf("%d %d %d\n", i+1, g.d[i], g.f[i]))
	}

	return strings.TrimRight(out.String(), "\n")
}

func answer(reader io.Reader) string {
	sc := bufio.NewScanner(reader)
	sc.Split(bufio.ScanWords)

	sc.Scan()
	n, _ := strconv.Atoi(sc.Text())

	var g Graph
	for i := 0; i < n; i++ {
		sc.Scan()
		u, _ := strconv.Atoi(sc.Text())
		sc.Scan()
		k, _ := strconv.Atoi(sc.Text())
		u--
		for j := 0; j < k; j++ {
			sc.Scan()
			v, _ := strconv.Atoi(sc.Text())
			v--
			g.M[u][v] = 1
		}
	}

	return g.dfs(n)
}

func main() {
	fmt.Println(answer(os.Stdin))
}

C++: #include <iostream>
#include <vector>
#include <numeric>

using namespace std;

vector<vector<int32_t>> A(101);
vector<int32_t> d(101), f(101);
int32_t t = 1;

void dfs(int32_t u) {
    d[u] = t++;

    for (int32_t v : A[u]) {
        if (d[v] == 0) {
            dfs(v);
        }
    }

    f[u] = t++;

    return;
}

int main() {
    fill(d.begin(), d.end(), 0);

    int32_t n;
    cin >> n;

    for (int32_t i = 0; i < n; i++) {
        int32_t u, k;
        cin >> u >> k;

        for (int32_t j = 0; j < k; j++) {
            int32_t v;
            cin >> v;

            A[u].push_back(v);
        }
    }

    for (int32_t i = 1; i <= n; i++) {
        if (d[i] == 0) {
            dfs(i);
        }
    }

    for (int32_t i = 1; i <= n; i++) {
        cout << i << " " << d[i] << " " << f[i] << endl;
    }

    return 0;
}

C++: #include <iostream>
#include <set>
#include <vector>
#include <queue>
#include <stack>
#include <utility>

using namespace std;

typedef long long signed int ll;

constexpr ll NIL = -20000000000;

int g[101][101],n,d[101],f[101];

int main() {
    cin >> n;
    for(int i = 0;i < n;i++) {
        int u,k,v;
        cin >> u >> k;
        for(int j = 0;j < k;j++) {
            cin >> v;
            g[u][v]++;
        }
    }
    stack<int> dfs;
    int time = 2;
    dfs.push(1);
    d[1] = 1;
    while(!dfs.empty()){
        int u = dfs.top();
        bool fl = false;
        for(int i = 1;i <= n;i++){
            if(g[u][i] && d[i] == 0 && u != i) {
                dfs.push(i);
                d[i] = time++;
                fl = true;
                break;
            }
        }
        if(!fl) {
            dfs.pop();
            f[u] = time++;
        }
    }
    for(int i = 1;i <=n;i++) {
        cout << i << " " << d[i] << " " << f[i] <<endl;
    }
}

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

static const int DFS_VISIT_NO   = 0;
static const int DFS_VISIT_NOW  = 1;
static const int DFS_VISIT_DONE = 2;

static int g_time = 0;
static int g_setime[100][2] = {0};

void DfsVisit(vector<int> graph[], int node, vector<int> &state)
{
    int i;
    int nnum;
    int target;

    ++g_time;
    g_setime[node][0] = g_time;

    state[node] = DFS_VISIT_NOW;
    
    nnum = graph[node].size();

    for (i = 0; i < nnum; i++) {
        target = graph[node][i];
        if (state[target] != DFS_VISIT_DONE) {
            DfsVisit(graph, target, state);
        }
    }

    state[node] = DFS_VISIT_DONE;

    ++g_time;
    g_setime[node][1] = g_time;

    return;
}


void DFS(vector<int> graph[], int num)
{
    int i;
    vector<int> state;

    for (i = 0; i < num; i++) {
        state[i] = DFS_VISIT_NO;
    }

    for (i = 0; i < num; i++) {
        if (state[i] == DFS_VISIT_NO) {
            DfsVisit(graph, i, state);
        }
    }

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

    return;
}

int main(void)
{
    int i, j;
    int target, tnum, node;
    int num;

    scanf("%d", &num);
    vector<int> graph[num];

    for (i = 0; i < num; i++) {
        scanf("%d" "%d", &target, &tnum);
        --target;
        for (j = 0; j < tnum; j++) {
            scanf("%d", &node);
            --node;
            graph[target].push_back(node);
        }
    }

    DFS(graph, num);
}

C++: #include <map>
#include <set>
#include <list>
#include <cmath>
#include <queue>
#include <stack>
#include <cstdio>
#include <string>
#include <vector>
#include <complex>
#include <cstdlib>
#include <cstring>
#include <numeric>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <functional>

#define mp       make_pair
#define pb       push_back
#define all(x)   (x).begin(),(x).end()
#define rep(i,n) for(int i=0;i<(n);i++)
#define repi(i,a,b) for(int i = (a); i < (b); i++)

using namespace std;

typedef    long long          ll;
typedef    unsigned long long ull;
typedef    vector<bool>       vb;
typedef    vector<int>        vi;
typedef    vector<vb>         vvb;
typedef    vector<vi>         vvi;
typedef    pair<int,int>      pii;

const int INF=1<<29;
const double EPS=1e-9;

const int dx[]={1,0,-1,0},dy[]={0,-1,0,1};
vector<int> d[120];
bool visit[120];
int cnt = 0;
int fin[120];
int st[120];
void dfs(int p){
	cnt++;
	st[p]=cnt;
	cout <<"p = "<<p<<" cnt = "<<cnt<<endl;
	visit[p]=true;
	for(int i =0;i <d[p].size();i++){
		if(!visit[d[p][i]]){
			dfs(d[p][i]);
		}
	}
	cnt++;
	fin[p]=cnt;

}
int main(){
	int n;
	cin>>n;
	memset(visit, false, sizeof(visit));
	for(int i =0;i < n;i++){
		int u,k;
		cin>>u>>k;
		for(int j =0;j < k;j++){
			int c;
			cin>>c;
			d[u].push_back(c);
		}
	}
	dfs(1);
	/*for(int i =1;i <=n;i++){
		cout <<i<<" "<<st[i]<<" "<<fin[i]<<endl;
	}*/
	return 0;
}

C++: #include<stdio.h>
#define N 100

static const int W=0;
static const int G=1;
static const int B=2;

int M[N][N],color[N],d[N],f[N];
int n,t=0;

void dfs_init(int u){
  int v;
  color[u] = G;
  t++;
  d[u] = t;
  for (v=0;v<n;v++){
    if(M[u][v] == 0)continue;
    if(color[v] == W){
      dfs_init(v);
    }
  }
  color[u] = B;
  t++;
  f[u] = t;
}

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


int main(){
  int i,j;
  int u,k,v; 
  
  scanf("%d", &n);
  for (i=0;i<n;i++){
    for(j=0;j<n;j++)M[i][j] = 0;
  }
  
  for(i=0;i<n;i++){
    scanf("%d %d",&u,&k);
    u--;
    for(j=0;j<k;j++){
      scanf("%d",&v);
      v--;
      M[u][v]=1;
    }
  }
  dfs();
}