Go: package main

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

func main() {
	scn := bufio.NewScanner(os.Stdin)
	scn.Split(bufio.ScanWords)
	nextInt := func() int { scn.Scan(); r, _ := strconv.Atoi(scn.Text()); return r }
	w := bufio.NewWriter(os.Stdout)

	n := nextInt()
	vecs := make([][]int, n)
	for i := 0; i < n; i++ {
		u := nextInt()
		k := nextInt()
		for j := 0; j < k; j++ {
			vecs[u-1] = append(vecs[u-1], nextInt()-1)
		}
	}

	ds := make([]int, n)
	fs := make([]int, n)
	founds := make([]bool, n)
	t := 0
	for i := range founds {
		if !founds[i] {
			t = dfs(vecs, ds, fs, founds, i, t)
		}
	}

	for i := 0; i < n; i++ {
		fmt.Fprintln(w, i+1, ds[i], fs[i])
	}

	w.Flush()
}

func dfs(vecs [][]int, ds, fs []int, founds []bool, i, t int) (time int) {
	t++
	ds[i] = t
	founds[i] = true
	for _, v := range vecs[i] {
		if !founds[v] {
			t = dfs(vecs, ds, fs, founds, v, t)
		}
	}
	t++
	fs[i] = t

	return t
}

C++: #include <algorithm>
#include<iostream>
#include<vector>
#include<deque>
#include<queue>
#include<list>
#include<stack>
#include<map>
#include<set>
#include<string>
#include <sstream>
#include<bitset>

#include<stdlib.h>
#include<string.h>
#include<math.h>
#include<limits.h>

using namespace std;
const int INF = 0x7fffffff;

int gcd(int x,int y){
  int mi,ma;
  ma = max(x,y);
  mi = min(x,y);
  if(ma % mi == 0){
    return mi;
  }
  else{
    return gcd(mi,ma % mi);
  }
}

using Graph = vector<vector<int>>;

int g[101][101];
int seen[101];
int stamp[2][101];
int n;
int t;

void dfs(int v){
  seen[v] = 1;
  int ii;

  //cout << v << endl;
  
  stamp[0][v] = t;
  t++;

  //for(ii=1;ii<=n;ii++){
  //  cout << seen[ii] << endl;
  //}
  
  for(ii=1;ii<=n;ii++){
    //cout << "v:"<< v << "ii:" << ii << " " << g[v][ii] << endl;

    if(seen[ii] == 1){continue;}
    //cout << "v:"<< v << "ii:" << ii << " " << g[v][ii] << endl;

    if(g[v][ii] == 1){
      dfs(ii);
    }
  }
  
  stamp[1][v] = t;
  t++;
}

int main(){
  long ii,jj,kk;
  vector<int> a;


  memset(g,0,sizeof(g));

  memset(stamp,0,sizeof(stamp));
  
  cin >> n;

  int v,vn,r;
  
  for(ii=0;ii<n;ii++){
    cin >> v;
    cin >> vn;
    for(jj=0;jj<vn;jj++){
      cin >> r;
      g[v][r] = 1;
    }
  }

  //for(ii=1;ii<=n;ii++){
  //  for(jj=1;jj<=n;jj++){
  //    cout << g[ii][jj] ;
  //    if(jj!=n){
  //      cout << " ";
  //    }
  //  }
  //  cout << endl;
  //}  
  
  t = 1;
  memset(seen,0,sizeof(seen));

  for(ii=1;ii<=n;ii++){
    if(seen[ii] == 0){
      dfs(ii);
    }

  }


  for(ii=1;ii<=n;ii++){
    cout << ii << " " << stamp[0][ii] << " " << stamp[1][ii] << endl;
  }
  return 0;
}

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

int main() {
    int n;
    cin >> n;

    vector<vector<int>> edge(n);
    for (int i = 0; i < n; i++) {
        int m, c;
        cin >> m >> c;
        for (int j = 0; j < c; j++) {
            int x;
            cin >> x;
            edge[i].push_back(--x);
        }
    }

    int timestamp = 1;
    vector <int> d(n, -1), f(n, -1);
    auto dfs = [&](auto dfs, int cur) -> void {
        d[cur] = timestamp++;
        for (int ch : edge[cur]) {
            if (d[ch] == -1) {
                dfs(dfs, ch);
            }
        }
        f[cur] = timestamp++;
    };

    for (int i = 0; i < n; i++) {
        if (d[i] == -1) {
            dfs(dfs, i);
        }
    }

    for (int i = 0; i < n; i++) {
        cout << i + 1 << ' ' << d[i] << ' ' << f[i] << '\n';
    }

    return 0;
}

C++: #include<bits/stdc++.h>
#define rep(i,n) for(int i=0; i<n; i++)
using namespace std;
bool visit[100];
int finish_time[100];
int find_time[100];
int t;
vector<int> E[100];
void dfs(int u){
  visit[u] = true;
  find_time[u] = ++t;
  for(int v : E[u]) if(!visit[v]) dfs(v);
  finish_time[u] = ++t;
}

int main(){
  int n;
  cin >> n;
  rep(i,n){
    int u,k;
    cin >> u >> k;
    u--;
    rep(j,k){
      int v;
      cin >> v;
      v--;
      E[u].push_back(v);
    }
  }
  rep(i,n) if(!visit[i]) dfs(i);
  rep(i,n){
    cout << i+1 << " " << find_time[i] << " " << finish_time[i] << endl;
  }
  return 0;
}

C++: #include <bits/stdc++.h>
#define PI 3.141592653
#define rep(i,a,n) for(int i=a;i<(int)n;++i)
#define SZ(x) ((int)(x).size())	//size() unsigned -> int
#define descSort(a) sort(a.begin(),a.end(),std::greater<int>())
using namespace std;
typedef long long ll;
const ll INF = 1e9 + 7;
ll gcd(ll x,ll y){
    if(x%y==0)return y;
    return gcd(y,x%y);
}

bool graph[100][100]={false};
int d[100],f[100];
bool visited[100]={false};
int t=0;
void dfs(int gsize,int now){
    if(visited[now]==false)d[now]=++t;
    visited[now]=true;

    for(int i=0;i<gsize;i++){
        if(graph[now][i]==true && visited[i]==false){
            dfs(gsize,i);
        }
    }
    f[now]=++t;
}
int main(void){
    int n;
    cin>>n;
    rep(i,0,n){
        int u,k;
        cin>>u>>k;
        u--;
        rep(j,0,k){
            int v;
            cin>>v;
            v--;
            graph[u][v]=true;
        }
    }
    rep(i,0,n){
        if(visited[i]==false)
            dfs(n,i);
    }
    rep(i,0,n){
        cout<<i+1<<" "<<d[i]<<" "<<f[i]<<endl;
    }
    return 0;
}

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

int n;
int t; //mytime?????????????????§???????´?
int mytime1[110],mytime2[110]; //?????§??????
int mat[110][110];
int c[110];

void dfs(int cur){
	t+=1;
	mytime1[cur]+=t;
	c[cur]=1;
	for(int dst=0; dst<n; ++dst){
		if(mat[dst][cur]==1&&c[dst]==0){
			dfs(dst);
		}
	}
	t += 1; 
	mytime2[cur]=t;
}


int main()
{
	vector<int> v[110];
	cin>>n;
	for(int i=0;i<n;i++){
		int u,k;
		cin>>u>>k;
		for(int j=0;j<k;j++){
			int tmp;
			cin>>tmp;
			v[u].push_back(tmp);
		}
	}
	for(int i=0;i<100;i++){
	}
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
			mat[i][j]=0;
		}
	}
	for(int i=1;i<n+1;i++){
		for(int j=0;j<v[i].size();j++){
			mat[i-1][v[i][j]-1]=1; //
		}
	}
	for(int i=0;i<n;i++){
    if(c[i]!=1){
      dfs(i);
    }
  }
  for(int i=0;i<n;i++)
    {
      cout<<(i+1)<<' '<<mytime1[i]<<' '<<mytime2[i]<<endl;
    }
}

C++: #define _CRT_SECURE_NO_WARNINGS
#define MAX 2000000000
#include <iostream>
#include <algorithm>
#include <stack>
using namespace std ;

int d[102] = { 0 }, f[102] = { 0 };
int M[102][102];

int main() {
	stack<int> stk;
	int n;
	cin >> n;
	for (int i = 1;i <= n;i++) {
		int k,l,m;
		cin >> m;
		cin >> k;
		for (int j = 0;j < k;j++) {
			cin >> l;
			M[m][l] = 1;
		}
	}
    
	stk.push(1);

    int i = 1,time=1,count=0;
    d[1]=1;
	while (count<n) {
		if (M[stk.top()][i] == 1 && d[i] == 0) {
			stk.push(i);
			time++;
			d[i] = time;
			i = 1;
		}
		else {
			i++;
			if (i > n) {
			    time++;
				f[stk.top()] = time;
				count++;
				stk.pop();
				i=1;
			}
		}
		if(stk.empty()){
		    for(int j=1;j<=n;j++)
		        if(d[j]==0){
		        stk.push(j);
		        time++;
		        d[j]=time;
		    }
		}
	}

	for (int i = 1;i <= n;i++) {
		cout << i << " " << d[i] << " " << f[i] << endl;
	}
  
}