Go: package main

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

/***************************************************************
stackによる深さ優先探索を実装する。
***************************************************************/

const (
	N     = 100
	WHITE = 0
	GRAY  = 1
	BLACK = 2
)

var (
	n            int
	Adj          [N][N]int
	statusColor  [N]int
	discoverTime [N]int
	finishTime   [N]int
	clock        int
	nt           [N]int
)

/***************************************************************
Stackの定義:
- field
	container: ノードの格納されたスライス
	sp: スタックポインタ
- method
	size(): スタックに積まれているノードの個数を返す
	top(): スタックの一番上に積まれているノードを返す
	isEmpty(): スタックが空かどうかを返す
	pop(): スタックの要素をポップし削除する
	push(): スタックに要素を積む
***************************************************************/

type Stack struct {
	container []int
	sp        int
}

func (s *Stack) size() int {
	return len(s.container)
}

func (s *Stack) top() int {
	return s.container[s.sp]
}

func (s *Stack) isEmpty() bool {
	return s.sp == 0
}

func (s *Stack) pop() int {
	_pop := func() {
		s.container = s.container[:len(s.container)-1]
	}
	defer _pop()
	if s.isEmpty() {
		panic("There is no elements in stack!")
	}
	s.sp--
	return s.container[s.sp]
}

func (s *Stack) push(n int) {
	s.sp++
	s.container[s.sp] = n
}

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

func _DFS(target int) {
	for i := 0; i < n; i++ {
		nt[i] = 0
	}
	stack := new(Stack)
	stack.container = make([]int, N)
	stack.push(target)
	statusColor[target] = GRAY
	clock++
	discoverTime[target] = clock
	for !stack.isEmpty() {
		u := stack.top()
		v := next(u)
		if v != -1 {
			if statusColor[v] == WHITE {
				statusColor[v] = GRAY
				clock++
				discoverTime[v] = clock
				stack.push(v)
			}
		} else {
			stack.pop()
			statusColor[u] = BLACK
			clock++
			finishTime[u] = clock
		}
	}
}

func DFS() {
	for i := 0; i < n; i++ {
		statusColor[i] = WHITE
		nt[i] = 0
	}
	clock = 0
	for i := 0; i < n; i++ {
		if statusColor[i] == WHITE {
			_DFS(i)
		}
	}
	for i := 0; i < n; i++ {
		fmt.Printf("%d %d %d\n", i+1, discoverTime[i], finishTime[i])
	}
}

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	scanner.Split(bufio.ScanWords)
	scanner.Scan()
	n, _ = strconv.Atoi(scanner.Text())
	for i := 0; i < n; i++ {
		for j := 0; j < n; j++ {
			Adj[i][j] = 0
		}
	}
	for i := 0; i < n; i++ {
		scanner.Scan()
		u, _ := strconv.Atoi(scanner.Text())
		scanner.Scan()
		k, _ := strconv.Atoi(scanner.Text())
		u--
		for j := 0; j < k; j++ {
			scanner.Scan()
			v, _ := strconv.Atoi(scanner.Text())
			v--
			Adj[u][v] = 1
		}
	}

	DFS()
}

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

#define MAX 120
#define WHITE 0
#define GRAY 1
#define BLACK 2

using namespace std;

static const int N =120;

int n;//頂点数
int T;//時刻
int d[MAX];//発見時刻
int f[MAX];//終了時刻
int color[MAX];//判別
int M[N][N];

void dfs_v(int u){
   
    color[u] = GRAY;
    T++;
    d[u] = T;
    for(int v=0; v<n; v++){
        if(M[u][v]==0){
            continue;
        }
        if(color[v]==WHITE){
            dfs_v(v);
        }
    }
    
    color[u]= BLACK;
    T++;
    f[u] = T;
}

void dfs(){
    for(int j=0; j<n; j++){
        color[j] = WHITE;
        
    }
    T = 0;
    
    for(int j=0; j<n; j++){
        if(color[j] == WHITE){
            dfs_v(j);
        }
    }
    
    for(int j=0; j<n; j++){
        printf("%d %d %d\n", j+1, d[j], f[j]);
    }
}

int main(){
    
    
    //cin >> n;
    
    int Adj[MAX];
    int u, k, v;
    
    scanf("%d", &n);
    
    for(int b=0; b<n; b++){
        for(int i=0; i<n; i++){
        M[b][i] = 0;
        }
    }
    
    
    
    for(int j=0; j<n; j++){
        //cin >> u >>k;
        scanf("%d %d", &u, &k);
        u--;
        for(int a=0; a<k; a++){
            /*cin >> v;
            Adj[v] = 1;
            
            if(Adj[v] != 0){
            M[u][v] = 1;
            }*/
            
            scanf("%d", &v);
            v--;
            M[u][v] = 1;
        }
    }
    
    dfs();
    return 0;
}