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>
#include<stack>
using namespace std;

#define S 100
#define BLACK 2
#define WHITE 0
#define GRAY 1

int n,a[S][S];
int cnd[S],d[S],f[S],T=0;
int nt[S];

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

void visit(int r){
    for(int i=0;i<n;i++)nt[i]=0;
    stack<int>st;
    st.push(r);
    cnd[r]=GRAY;
    d[r]=++T;

    while(!st.empty()){
        int u=st.top();
        int v=next(u);
        if(v!=-1){
            if(cnd[v]==WHITE){
                cnd[v]=GRAY;
                d[v]=++T;
                st.push(v);
            }
        }else{
            st.pop();
            cnd[u]=BLACK;
            f[u]=++T;
        }
    }
}

void outp(){
    for(int i=0;i<n;i++){
        cnd[i]=WHITE;
        //nt[i]=0;
    }

    for(int j=0;j<n;j++){
        if(cnd[j]==WHITE)visit(j);
    }
    for(int k=0;k<n;k++){
        cout<<k+1<<" "<<d[k]<<" "<<f[k]<<endl;
    }
}

int main(){
    int u,k,J,i,j;
    cin>>n;
    for(i=0;i<n;i++){
        for(j=0;j<n;j++)a[i][j]=0;
    }
    for(i=0;i<n;i++){
        cin>>u>>k;
        for(j=0;j<k;j++){
            cin>>J;
            a[u-1][J-1]=1;
        }
    }
    outp();
    return 0;
}

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

int t=0,k,n;
int gone[100+10]={},before[100+10]={},a[100+10][100+10]={};

void dfs(int cur){
    if(gone[cur]!=1){
        t+=1;
        cerr << "visiting " << cur << " at " << t << endl;
        gone[cur]=1;
    }
    for(int m=1;m<=n;m++){
        if(a[cur][m]==1){
            if(gone[m]==0){
                dfs(m);
            }
        }
    }
    t+=1;
    cerr << "complete " << cur << " at " << t << endl;
}

int main(){
    cin >> n;
    for(int i=1;i<=n;i++){
        int u,p;
        cin >> u >> k;
        for(int j=0;j<k;j++){
            cin >> p;
            a[i][p]=1;
        }
    }
    for(int q=1;q<=n;q++){
        if(gone[q]!=1) dfs(q);
    }
}

C++: #include <bits/stdc++.h>
using ll = long long;
using namespace std;
#define _overload3(_1, _2, _3, name, ...) name
#define _rep(i, n) repi(i, 0, n)
#define repi(i, a, b) for(int i = int(a); i < int(b); ++i)
#define rep(...) _overload3(__VA_ARGS__, repi, _rep, )(__VA_ARGS__)
const long long INFLL = 1LL << 60;
const int INFINT = 1 << 30;
const long long MOD = 1e9 + 7;

vector<vector<int>> G(101, vector<int>(0));
vector<int> c(101, 0);
vector<int> d(101, 0);
vector<int> f(101, 0);

template <class T> void vecout(T V) {
    auto t = V.begin();
    *t++;
    while(t != V.end()) {
        cout << " " << *t++;
        // if(t != V.end()) cout << " ";
    }
    cout << endl;
};

int t = 0;
void dfs(int i) {
    if(c[i]) return;
    c[i] = 1;
    d[i] = ++t;
    for(auto e : G[i])
        dfs(e);
    f[i] = ++t;
}

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int n, a, b, c;
    cin >> n;
    rep(i, n) {
        cin >> a >> b;
        rep(j, b) {
            cin >> c;
            G[a].push_back(c);
        }
    }
    rep(i, 1, n + 1) dfs(i);

    rep(i, 1, n + 1) cout << i << " " << d[i] << " " << f[i] << "\n";
}

C++: 	#include<stdio.h>
	int k[101]={0},d[101]={},f[101]={};
	int v[101][101]={0};
	int cur;
	void dfs(int id){
		if(d[id]!=0){
			return;
			}
			cur++;
			if(d[id]==0){
				d[id]=cur;
			}
			for(int i=0;i<k[id];i++){
				dfs(v[id][i]);
			}
			cur++;
			f[id]=cur;
			return;
		}
		int main(void){
		int n=0,u=0;
		scanf("%d",&n);
		for(int i=0;i<n;i++){
			scanf("%d",&u);
			scanf("%d",&k[u]);
			for(int j=0;j<k[u];j++){
				scanf("%d",&v[u][j]);//uからいけるj個目のノードがv[u][j]
			}
		}
		for(int i=1;i<n;i++){
		if(d[i]==0){
		dfs(i);
		}
		}
		for(int i=1;i<=n;i++){
			printf("%d %d %d\n",i,d[i],f[i]);
		}
	return(0);
}