Go: package main

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

var scanner = bufio.NewScanner(os.Stdin)

func nextString() string {
	scanner.Scan()
	return scanner.Text()
}

func nextInt() int {
	n, err := strconv.Atoi(nextString())
	if err != nil {
		fmt.Printf("strconv.Atoi failed: %v\n", err)
	}
	return n
}

var infty = 1000000000

type nodeKey int

type DirectedGraphNode struct {
	key       nodeKey
	adjacents []*DirectedGraphNode
	visited   bool
	d         int
	f         int
	parent    *DirectedGraphNode
}

type DirectedGraph struct {
	nodes []*DirectedGraphNode
}

func (g *DirectedGraph) setAdjacency(l, r nodeKey) {
	g.nodes[l].adjacents = append(g.nodes[l].adjacents, g.nodes[r])
}

func newDirectedGraph(nNodes int) *DirectedGraph {
	graph := DirectedGraph{}
	graph.nodes = make([]*DirectedGraphNode, nNodes)
	for iNodes := 0; iNodes < nNodes; iNodes++ {
		graph.nodes[iNodes] = &DirectedGraphNode{}
		graph.nodes[iNodes].key = nodeKey(iNodes)

		graph.nodes[iNodes].visited = false
		graph.nodes[iNodes].d = infty
		graph.nodes[iNodes].f = infty
		graph.nodes[iNodes].parent = nil
	}
	return &graph
}

type QueueEntry struct {
	node *DirectedGraphNode
	next *QueueEntry
}

type Queue struct {
	head, tail *QueueEntry
}

func (q *Queue) enqueue(node *DirectedGraphNode) {
	entry := QueueEntry{}
	entry.node = node

	if q.tail == nil {
		q.head = &entry
		q.tail = &entry
		return
	}

	q.tail.next = &entry
	q.tail = q.tail.next
}

func (q *Queue) dequeue() *QueueEntry {
	if q.head == nil {
		return nil
	}
	poped := q.head
	q.head = q.head.next
	if q.head == nil {
		q.tail = nil
	}
	return poped
}

func (q *Queue) isEmpty() bool {
	return q.head == nil
}

var time = 0

func fillDistancesByDepthFirstSearch(g *DirectedGraph) {
	for _, u := range g.nodes[1:] {
		if !u.visited {
			dfsVisit(g, u)
		}
	}
}

func dfsVisit(g *DirectedGraph, u *DirectedGraphNode) {
	time++
	u.d = time

	u.visited = true
	for _, v := range u.adjacents {
		if !v.visited {
			v.parent = u
			dfsVisit(g, v)
		}
	}
	time++
	u.f = time
}

func main() {
	scanner.Split(bufio.ScanWords)

	nNodes := nextInt()
	g := newDirectedGraph(nNodes + 1)

	for iNode := 0; iNode < nNodes; iNode++ {
		nodeKeyLeft := nodeKey(nextInt())
		nAdj := nextInt()
		for iAdj := 0; iAdj < nAdj; iAdj++ {
			nodeKeyRight := nodeKey(nextInt())
			g.setAdjacency(nodeKeyLeft, nodeKeyRight)
		}
	}

	fillDistancesByDepthFirstSearch(g)

	for iNode := 1; iNode <= nNodes; iNode++ {
		node := g.nodes[iNode]
		fmt.Println(node.key, node.d, node.f)
	}
}

C++: // clang-format off
#include <bits/stdc++.h>
#define int long long
#define main signed main()
// #define main int main()
#define loop(i, a, n) for (int i = (a); i < (n); i++)
#define rep(i, n) loop(i, 0, n)
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()
#define prec(n) fixed << setprecision(n)
#define stlice(from, to) substr(from, (to) - (from) + 1)
#define pb push_back
#define mp make_pair
#define mt make_tuple
#define fi first
#define se second
using namespace std;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<double> vd;
typedef vector<char> vc;
typedef vector<bool> vb;
typedef vector<string> vs;
typedef vector<pii> vpii;
typedef vector<vi> vvi;
typedef vector<vb> vvb;
typedef vector<vpii> vvpii;
const int INF = sizeof(int) == sizeof(long long) ? 1000000000000000000LL : 1000000000;
const int MOD = 1000000007;
const double PI = acos(-1);
template<typename A, typename B> bool cmin(A &a, const B &b) { return a > b ? (a = b, true) : false; }
template<typename A, typename B> bool cmax(A &a, const B &b) { return a < b ? (a = b, true) : false; }
bool odd(const int &n) { return n & 1; }
bool even(const int &n) { return !odd(n); }
void solve();
main { solve(); return 0; }
// clang-format on

typedef int Weight;

struct Edge {
  int src, dst;
  Weight weight;
  Edge(int s, int d, Weight w)
    : src(s), dst(d), weight(w) {
  }
};

typedef vector<Edge> Edges;
typedef vector<Edges> Graph;
typedef vector<Weight> Array;
typedef vector<Array> Matrix;

void addEdge(Graph &g, int a, int b, Weight w = 1) {
  g[a].emplace_back(a, b, w);
  g[b].emplace_back(b, a, w);
}

void addArc(Graph &g, int a, int b, Weight w = 1) {
  g[a].emplace_back(a, b, w);
}

void solve() {
  int n;
  cin >> n;
  Graph g(n);
  rep(i, n) {
    int u, k;
    cin >> u >> k;
    u--;
    while (k--) {
      int v;
      cin >> v;
      v--;
      addArc(g, u, v);
    }
  }
  int c = 1;
  vi done(n);
  vpii time(n);
  function<void(int)> dfs = [&](int x) {
    if (done[x]) return;
    done[x]    = true;
    time[x].fi = c++;
    for (Edge e : g[x]) {
      dfs(e.dst);
    }
    time[x].se = c++;
  };
  rep(i, n) dfs(i);
  rep(i, n) {
    cout << i + 1 << ' ' << time[i].fi << ' ' << time[i].se << endl;
  }
}

C++: 
#include<iostream>
#include<stack>
using namespace std;
#define NIL -999
bool mark[105][105];
int n;
int tm = 0;
int d[105] = { 0 };
int f[105] = { 0 };

inline int next(int i) {
	for (int tmp = 1; tmp <= n; ++tmp) {
		if (mark[i][tmp] && !d[tmp]) {
			//cout << endl << i << "的下一个节点是：" << tmp << endl;
			return tmp;
		}
	}
	//cout << endl << i << "的下一个节点是：" << NIL << endl;
	return NIL;
}

void dfs_IN(int i) {
	stack<int> s;
	int now = i, nt;
	d[i] = ++tm;
	s.push(i);
	//	s.push(i);
	//	d[i] = ++tm;
	//first solution
	/*do {
		//		cout<<"visit: "<<now<<endl;
		if (!s.empty()) {
			now = s.top();
			s.pop();
		}
		do {
			//cout << "visit: " << now << endl;
			nt = next(now);
			if (nt != NIL && !d[nt]) {
				s.push(now);
				d[nt] = ++tm;
				now = nt;
			}
			else break;
		} while (true);
		//cout << "end visit:  " << now << endl;
		f[now] = ++tm;
		
	} while (!s.empty());*/
	//solution 2
	while (!s.empty()) {
		now = s.top();
		nt = next(now);
		if (nt != NIL) {
			d[nt] = ++tm;
			s.push(nt);
		}
		else {
			s.pop();
			f[now] = ++tm;
		}
	}
}

void dfs() {
	for (int i = 0; i <= n + 2; ++i)
		for (int k = 1; k <= n + 2; ++k)
			mark[i][k] = false;

	int Node, k, tmp;
	cin >> n;
	for (int l = 0; l<n; l++) {
		cin >> Node >> k;
		for (int x = 0; x<k; x++) {
			cin >> tmp;
			mark[Node][tmp] = true;
		}
	}

	for (int p = 1; p <= n; ++p)
		if(!d[p])dfs_IN(p);

	for (int p = 1; p <= n; ++p)
		cout << p << ' ' << d[p] << ' ' << f[p] << endl;

}

int main() {

	dfs();
	return 0;
}

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

#define NIL 0

struct Node{
    int d=0, f=0, ch=0;
    int child[100]={0};
};

Node nodes[101];

int search(int num, int time){
    if(nodes[num].d!=NIL){
        return time;
    }
    nodes[num].d = time;
    ++time;
    for(int i=0;i<nodes[num].ch;++i){
        time = search(nodes[num].child[i], time);
    }
    nodes[num].f = time;
    ++time;
    return time;
}

int main(){
    
    int n, num=0, time = 1;
    cin >> n;
    for(int i=1;i<=n;++i){
        cin>>num;
        cin >> nodes[num].ch;
        for(int j=0;j<nodes[num].ch;++j){
            cin >> nodes[num].child[j];
        }
    }
    
    
    for(int i=1;i<=n;++i){
        if(nodes[i].d==NIL){
            time = search(i, time);
        }
    }
    
    
    for(int i=1;i<=n;i++){
        cout << i << " " << nodes[i].d << " " <<nodes[i].f << endl;
        
    }
    
    
    
    return 0;
}

C++: #include<iostream>
using namespace std;
typedef struct{
  int A[1000];
  int begin;
  int end;
}node;
node T[105];
int times=0;
  int n;
void function(int num){
  if(T[num].begin==0){
  times++;
    T[num].begin=times;
  }
  for(int j=1;j<=n;j++){
    if(T[num].A[j]==1){
      T[num].A[j]=0;
      function(j);
    }
  }
  if(T[num].end==0){
    times++;
    T[num].end=times;
  }
}
int main(){
  int num;
  int son;
  int z;
  cin>>n;
  for(int i=0;i<n;i++){
    cin>>num;
    cin>>son;
    for(int j=0;j<son;j++){
      cin>>z;
      T[num].A[z]=1;
      }
  }
  for(int i=1;i<=n;i++){
    function(i);
  }
  for(int i=1;i<=n;i++){
      cout<<i<<" "<<T[i].begin<<" "<<T[i].end<<endl;
  }


  return 0;
}