Go: package main

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

type vertexId int

type vertex struct {
	id vertexId
	firstVisitAt int
	finishVisitAt int
	adjs []vertexId
}

func createVertex(id int, adjsInt []int) vertex {
	adjs := make([]vertexId, len(adjsInt))
	for i := 0; i < len(adjs); i++ {
		adjs[i] = vertexId(adjsInt[i])
	}
	return vertex{
		id: vertexId(id),
		firstVisitAt: 0,
		finishVisitAt: 0,
		adjs: adjs,
	}
}

func (v *vertex) doesAllAdjsVisited(vertices []vertex) bool {
	for _, vId := range v.adjs {
		adj := vertices[vId-1]
		if !adj.isVisited() {
			return false
		}
	}
	return true
}

func (v *vertex) isFirstVisit() bool {
	return v.firstVisitAt == 0
}

func (v *vertex) isVisited() bool {
	return v.firstVisitAt > 0
}

func (v *vertex) nextVertex(vertices []vertex) (vertexId, error) {
	for _, vId := range v.adjs {
		adj := vertices[vId-1]
		if !adj.isVisited() {
			return vId, nil
		}
	}
	return vertexId(-1), fmt.Errorf("illegal")
}

func dfs(currentId vertexId, timestamp int, vertices []vertex) int {
	timestamp = timestamp + 1
	currentVertex := &vertices[currentId-1]
	if currentVertex.isFirstVisit() {
		currentVertex.firstVisitAt = timestamp
	}
	for !currentVertex.doesAllAdjsVisited(vertices) {
		nextVertexId, _ := currentVertex.nextVertex(vertices)
		timestamp = dfs(nextVertexId, timestamp, vertices)
	}
	timestamp = timestamp + 1
	currentVertex.finishVisitAt = timestamp
	return timestamp
}

func main() {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)

	n, err := nextInt(sc)
	if err != nil {
		panic(err)
	}

	vertices := make([]vertex, n)
	for i := 0; i < n; i++ {
		id, err := nextInt(sc)
		if err != nil {
			panic(err)
		}
		adjN, err := nextInt(sc)
		if err != nil {
			panic(err)
		}
		adjs := make([]int, adjN)
		for j := 0; j < adjN; j++ {
			adjId, err := nextInt(sc)
			if err != nil {
				panic(err)
			}
			adjs[j] = adjId
		}
		vertices[i] = createVertex(id, adjs)
	}

	dfs(vertexId(1), 0, vertices)

	for i := 0; i < n; i++ {
		fmt.Printf("%d %d %d\n", vertices[i].id, vertices[i].firstVisitAt, vertices[i].finishVisitAt)
	}
}

func nextText(sc *bufio.Scanner) string {
	sc.Scan()
	return sc.Text()
}

func nextInt(sc *bufio.Scanner) (int, error) {
	return strconv.Atoi(nextText(sc))
}

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

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

//uに隣接するvを番号順に取得
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] = GRAY;
    d[r] = ++tt;
    
    while(!S.empty()) {
        int u = S.top();
        int v = next(u);
        if(v != -1) {
            if(color[v] == WHITE) {
                color[v] = GRAY;
                d[v] = ++tt;
                S.push(v);
            }
        }else {
            S.pop();
            color[u] = BLACK;
            f[u] = ++tt;
        }
    }
}

void dfs() {
    //初期化
    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 >> n;
    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++: // 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;
}