Go: package main

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

func getScanner(fp *os.File) *bufio.Scanner {
	scanner := bufio.NewScanner(fp)
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
	return scanner
}

func getNextString(scanner *bufio.Scanner) string {
	scanner.Scan()
	return scanner.Text()
}

func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}

func getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}

func getNextUint64(scanner *bufio.Scanner) uint64 {
	i, _ := strconv.ParseUint(getNextString(scanner), 10, 64)
	return i
}

func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}

func main() {
	fp := os.Stdin
	wfp := os.Stdout
	cnt := 0

	if os.Getenv("MASPY") == "ますピ" {
		fp, _ = os.Open(os.Getenv("BEET_THE_HARMONY_OF_PERFECT"))
		cnt = 1
	}
	if os.Getenv("MASPYPY") == "ますピッピ" {
		wfp, _ = os.Create(os.Getenv("NGTKANA_IS_GENIUS10"))
	}

	scanner := getScanner(fp)
	writer := bufio.NewWriter(wfp)
	solve(scanner, writer)
	for i := 0; i < cnt; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
	writer.Flush()
}

func solve(scanner *bufio.Scanner, writer *bufio.Writer) {
	n := getNextInt(scanner)
	g := graph{}
	g.ee = make([]Edges, n)
	g.visited = make([]bool, n)
	g.found = make([]int, n)
	g.leave = make([]int, n)
	for i := 0; i < n; i++ {
		u := getNextInt(scanner) - 1
		k := getNextInt(scanner)
		for j := 0; j < k; j++ {
			v := getNextInt(scanner) - 1
			g.ee[u] = append(g.ee[u], Edge{
				to: v,
				id: u,
			})
		}
	}
	for i := 0; i < n; i++ {
		sort.Sort(g.ee[i])
	}
	for i := 0; i < n; i++ {
		if g.visited[i] {
			continue
		}
		g.dfs(i)
	}

	for i := 0; i < n; i++ {
		fmt.Fprintln(writer, fmt.Sprintf("%d %d %d", i+1, g.found[i], g.leave[i]))
	}
}

// Edge ...
type Edge struct {
	to, id int
}

type Edges []Edge

func (a Edges) Len() int           { return len(a) }
func (a Edges) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
func (a Edges) Less(i, j int) bool { return a[i].id < a[j].id }

type graph struct {
	ee           []Edges
	t            int
	n            int
	visited      []bool
	found, leave []int
}

func (g *graph) dfs(i int) {
	g.visited[i] = true
	g.t++
	g.found[i] = g.t
	for _, e := range g.ee[i] {
		if g.visited[e.to] {
			continue
		}
		g.dfs(e.to)
	}
	g.t++
	g.leave[i] = g.t
}

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 = 1; i <= n; i++) {
        if (Chk[i-1][0] == 0)
            dfs(i, n);
    }

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

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

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


int next(int u) {
	for (int v = nt[u]; v < n; v++) {
		nt[u] = v + 1;
		if (M[u][v]) 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] = GREY;
	d[r] = ++tt;

	while (!S.empty()) {
		int u = S.top();
		int v = next(u);
		if (v != -1) {
			if (color[v] == WHITE) {
				color[v] = GREY;
				d[v] = ++tt;
				S.push(v);
			}
		}
		else {
			S.pop();
			color[u] = BLACK;
			f[u] = ++tt;
		}
	}
}


void dfs() {
	for (int i = 0; i < n; i++) {
		color[i] = WHITE;
		nt[i] = 0;
	}
	tt = 0;

	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 u, k, v;

	cin >> u;
	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 j = 0; j < k; j++) {
			cin >> v;
			v--;
			M[u][v] = 1;
		}
	}

	dfs();

	return 0;
}

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

using namespace std;

static const int N = 100;
static const int YET = 0;
static const int ALREADY = 1;

int main(void) {
  int M[N][N];
  int state[N];
  int timeTable[N][2];

  stack<int> st;

  int timeCount = 0;
  int n, u, k, v;

  cin >> n;

  //?????????
  for(int i = 0; i < n; i++) {
    for(int j = 0; j < n; j++) {
      M[i][j] = 0;
    }
  }

  //Graph -> Matrix
  for(int i = 0; i < n; i++) {
    cin >> u >> k;
    u--;//0-origian
    for(int j = 0; j < k; j++) {
      cin >> v;
      v--;
      M[u][v] = 1;
    } 
  }

  st.push(0);
  int currentV;
  while(!st.empty()) {
    timeCount++;
    currentV = st.top();
    st.pop();

    if(state[currentV] == YET) {
      timeTable[currentV][0] = timeCount;
      state[currentV] = ALREADY;
      st.push(currentV);

      for(int i = N; i > -1; i--) {
        if(M[currentV][i] == 1 && state[i] == YET) {
          st.push(i);
        }
      }
    }
    else if(timeTable[currentV][1] == 0){
      timeTable[currentV][1] = timeCount;
    }
    else {
      timeCount--;
    }
  }


  for(int i = 0; i < n; i++) {
    cout << i + 1 << " " << timeTable[i][0] << " " << timeTable[i][1] << endl;
  }
  return 0;
}

C++: #include<bits/stdc++.h>
#define MOD 1000000007
#define INF 0x3f3f3f3f
#define INFL 0x3f3f3f3f3f3f3f3f
#define EPS (1e-10)
#define rep(i,n)for(int i=0;i<n;i++)
using namespace std;
typedef long long ll;
typedef pair<int, int>P;

vector<int>E[100];
int s[100], g[100];
bool used[100];
int t;

void dfs(int u) {
	used[u] = true;
	s[u] = ++t;
	for (int v : E[u]) {
		if (!used[v])dfs(v);
	}
	g[u] = ++t;
}
int main() {
	int n; scanf("%d", &n);
	rep(i, n) {
		int u, k; scanf("%d%d", &u, &k); u--;
		rep(j, k) {
			int v; scanf("%d", &v); v--;
			E[u].push_back(v);
		}
	}
	rep(i, n) {
		if (!used[i])dfs(i);
	}
	rep(i, n) {
		printf("%d %d %d\n", i + 1, s[i], g[i]);
	}
}