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>
#define MAX 101

using namespace std;

bool flag[MAX][MAX];
int t[MAX][2];
int n;

void dfs(int num){
	static int cnt = 1;
	
	if(t[num][0] == 0)t[num][0] = cnt++;
	else return;
	for(int i=1;i<=n;++i){
		if(flag[num][i] == true){
			dfs(i);
		}
	}
	t[num][1] = cnt++;
}

int main(){
	int u, k, v, i, j; 
	
	cin >> n;
	for(i=1;i<=n;++i){
		cin >> u >> k;
		for(j=0;j<k;++j){
			cin >> v;
			flag[u][v] = true;
		}
		 
	}
	for(int i=1;i<=n;++i)dfs(i);
	for(int i=1;i<=n;++i)cout << i << " " << t[i][0] << " " << t[i][1] << endl;
	
	return 0;
}

C++: #include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <stack>

using namespace std;


struct Edge{ //??°????????????
public:
    int src, dst;
    int weight;
    Edge(int a,int b):src(a),dst(b),weight(1){} //?????????????????????
    void setWeight(double x){
        weight = x;
    }
};
typedef vector<Edge> Edges; //???????????£??\?????????
typedef vector<Edges> Graph; //??°???????????£??\???????????¨???

typedef vector<int> Array; //??´??°?????????
typedef vector<Array> Matrix; //??´??°???????????£??\?????????

const int N = 100;
const int White = 0, Gray = 1, Black =2;

int n;
int tt = 0;
Matrix M(N,Array(N,0));
vector<int> d(N,0), f(N,0);
vector<int> color(N,0);


vector<int> nt(N,0);//???????????????????????????????????§?????????????¨???¶??????

int next(int u){ //???u?????\?¶??????????????????????????????????
    if (nt[u]!= n) {
        for(int i = nt[u];i<n;i++){
            if(M[u][i]){
                nt[u] = i+1;
                return i;
            }
        }
        return -1;
    } else {
        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 v = S.top();
        int w = next(v);
        if (w != -1) {
            if (color[w]==White) {
                color[w] = Gray;
                d[w] = ++tt;
                S.push(w);
            }
        } else {
            S.pop();
            color[v] = Black;
            f[v] = ++tt;
        }
    }
    
}

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


int main(){
    
    int k,v,w;
    
    cin >> n; //??°????????????????????\???
    
    for (int i=0; i<n; i++) { //??????????¬???°?????????????????\??? ???????????\??????????????£??\??????????????£??\?????????????´?
        cin >> w >> k;
        for (int j=0; j<k; j++) {
            cin >> v;
            M[w-1][v-1] = 1; //?????????
        }
    }
    
    dfs();
    
    return 0;
}

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

// 総数を1000000007で割った余り
const long long mod = 1e9 + 7;

using ll  = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
#define ull unsigned long long
#define ld long double
#define vi vector<int>
#define vll vector<ll>
#define vc vector<char>
#define vs vector<string>
#define vpii vector<pii>
#define vpll vector<pll>

#define rep(i, n) for (int i = 0, i##_len = (n); i < i##_len; i++)
#define rep1(i, n) for (int i = 1, i##_len = (n); i <= i##_len; i++)
#define repr(i, n) for (int i = ((int)(n)-1); i >= 0; i--)
#define rep1r(i, n) for (int i = ((int)(n)); i >= 1; i--)

#define sz(x) ((int)(x).size())
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()

#define SORT(v, n) sort(v, v + n);
// #define SORT(v, n) stable_sort(v, v + n);
#define VSORT(v) sort(v.begin(), v.end());
#define RSORT(x) sort(rall(x));
#define pb push_back
#define mp make_pair

#define INF (1e9)
#define PI (acos(-1))
#define EPS (1e-7)

ull gcd(ull a, ull b) { return b ? gcd(b, a % b) : a; }
ull lcm(ull a, ull b) { return a / gcd(a, b) * b; }

const int N     = 100;
int       white = 0;
int       gray  = 1;
int       black = 2;

int n, m[N][N];
int color[N], d[N], f[N], tt;

// 再帰による深さ優先探索
void dfs_visit(int u) {
    color[u] = gray;
    d[u]     = ++tt;  //最初の訪問
    rep(v, n) {
        if (m[u][v] == 0) continue;
        if (color[v] == white) {
            dfs_visit(v);
        }
    }
    color[u] = black;
    f[u]     = ++tt;  // 訪問の完了
}

void dfs() {
    //初期化
    rep(u, n) color[u] = white;
    tt                 = 0;
    rep(u, n) {
        // 未訪問のuを始点として深さ優先探索
        if (color[u] == white) dfs_visit(u);
    }
    rep(u, n) { cout << u + 1 << " " << d[u] << " " << f[u] << endl; }
}

// 再帰による深さ優先探索
int main() {
    int u, v, k;
    cin >> n;
    rep(i, n) rep(j, n) m[i][j] = 0;

    rep(i, n) {
        cin >> u >> k;
        u--;
        rep(j, k) {
            cin >> v;
            v--;
            m[u][v] = 1;
        }
    }
    dfs();

    return 0;
}