Go: package main

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

var sc = bufio.NewScanner(os.Stdin)
var depth [101]int
var finish [101]int
var d [101]int
var n, time int

func nextInt() int {
	sc.Scan()
	i, _ := strconv.Atoi(sc.Text())
	return i
}
func visit(graph [][]int, u int) {
	depth[u] = 1
	time++
	d[u] = time
	for i := 0; i < n; i++ {
		if graph[u][i] == 1 {
			if depth[i] == 0 {
				visit(graph, i)
			}
		}
	}
	depth[u] = 2
	time++
	finish[u] = time
}
func main() {
	sc.Split(bufio.ScanWords)

	n = nextInt()
	graph := make([][]int, n)
	for i := 0; i < n; i++ {
		graph[i] = make([]int, n)
	}
	for i := 0; i < n; i++ {
		s := nextInt()
		t := nextInt()
		if t == 0 {
			continue
		}
		for i := 0; i < t; i++ {
			u := nextInt()
			graph[s-1][u-1] = 1
		}
	}
	for i := 0; i < n; i++ {
		if depth[i] == 0 {
			visit(graph, i)
		}
	}
	for i := 0; i < n; i++ {
		fmt.Printf("%d %d %d\n", i+1, d[i], finish[i])
	}
}

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

#define endl '\n'
#define ll long long
#define ui unsigned int
#define ull unsigned long long

int main(void)
{
    int n;
    while (cin >> n)
    {
        int adj[10][10]={{0}};
        int tmpn = n;
        while (tmpn--)
        {
            int u, k;
            cin >> u >> k;
            for (int i = 0 ; i < k ; i++)
            {
                int tmp;
                cin >> tmp;
                adj[u-1][tmp-1] = 1;
            }
        }

        stack<int> stk;
        int g[10]={0}, f[10]={0};
        g[0] = 1;
        int current = 2;
        int isEnd = 1;

        stk.push(1);
        while (!stk.empty())
        {
            int now = stk.top();
            for (int i = 0 ; i < n ; i++)
            {
                if (adj[now-1][i] == 1 && g[i] == 0)
                {
                    stk.push(i+1);
                    g[i] = current++;
                    isEnd = 0;
                }
            }
            if(isEnd)
            {
                if (g[now-1] == 0)
                {
                    g[now-1] = current++;
                }
                f[now-1] = current++;
                stk.pop();
            }
            isEnd = 1;
        }
        for (int i = 0 ; i < n ; i++)
        {
            cout << i+1 << " " << g[i] << " " << f[i] << endl;
        }

    }
    return 0;
}

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

int G[101][102];
int found[101];
int comp[101];   // complete.
int t;  // time.

typedef struct box{ int val; box* next; } box_t;  // stack.

box_t* init()
{
    box_t* head = new box_t;
    head->val = -1;
    head->next = NULL;
    return head;
}

bool isEmpty(box_t* head){ return (head->next == NULL ? true : false); }

box_t* push(box_t* head, int data)
{
    box_t* box = new box_t;
    box->val = data;
    box->next = head->next;
    head->next = box;
    return box;
}

int pop(box_t* head)
{
    if(isEmpty(head)){ return -1; }
    box_t* box = head->next;
    int val;
    head->next = box->next;
    val = box->val;
    delete box;
    return val;
}

int front(box_t* head)
{
    int val;
    if(isEmpty(head)){ return -1; }
    val = head->next->val;
    return val;
}

box_t* stack = init();

void search_loop(int i)
{
    int j, k;
    while(1){
        if(found[i] == 0){
            t++; found[i] = t;
            push(stack, i);
        }
        for(k = G[i][0]; G[i][k] != 0 && found[G[i][k]] != 0; k++);
        if(G[i][k] == 0){
            if(isEmpty(stack)){ return; }
            else{
                j = pop(stack);
                t++; comp[j] = t;
                i = front(stack);
            }
        }else{
            G[i][0] = k + 1;
            i = G[i][k];
        }
    };
    return;
}

int main()
{
    int n, i, j, a, b, e;
    scanf("%d", &n);
    for(i = 1; i <= n; i++){
        G[i][0] = 1;
        for(j = 1; j <= n + 1; j++){ G[i][j] = 0; } }

    for(i = 1; i <= n; i++){
        scanf("%d %d", &a, &e);
        for(j = 1; j <= e; j++){
            scanf("%d", &b); G[a][j] = b; } }  // adjacent representation.

    for(i = 1; i <= n; i++){ found[i] = 0; comp[i] = 0; }
    t = 0;
    while(1){
        for(i = 1; i <= n; i++){
            if(found[i] == 0) break;
        }
        if(i > n) break;
        search_loop(i);
    };

    for(i = 1; i <= n; i++){
        cout << i << " " << found[i] << " " << comp[i] << endl;
    }
    return 0;
}

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

int N;
int G[101][101];
int visited[101];

int start[101], complete[101];

int dfs(int v, int t) {
    visited[v] = 1;
    start[v] = t;
    int nt = t+1;
    for (int j = 0; j <= N; ++j) {
        if (!visited[j] && G[v][j]) {
            nt = dfs(j, nt);
        }
    }
    complete[v] = nt;
    return nt+1;
}

int main() {
    cin >> N;
    for (int j = 0; j <= N; ++j) for (int k = 0; k <= N; ++k) G[j][k] = 0;
    for (int j = 0; j <= N; ++j) visited[j] = 0;
    for (int _ = 0; _ < N; ++_) {
        int u, k;
        cin >> u >> k;
        for (int j = 0; j < k; ++j) {
            int v; cin >> v;
            G[u][v] = 1;
        }
    }

    int tt = 1;
    for (int j = 1; j <= N; ++j) {
        if (!visited[j]) tt = dfs(j, tt);
    }

    for (int j = 1; j <= N; ++j) {
        cout << j << " " << start[j] << " " << complete[j] << endl;
    }

    return 0;
}

C++: #include<iostream>
#include<algorithm>
#include<vector>
#include<stack>
#include<queue>
#include<list>
#include<string>
#include<cstring>
#include<cstdlib>
#include<cstdio>
#include<cmath>
using namespace std;

const int NIL = -1;
const int MAX = 20001;

int G[101][101];
int color[101], d[101], f[101];
int t = 0;

void dfs(int u, int n)
{
	color[u] = 1;
	d[u] = ++t;
	for (int v = 1; v <= n; v++) {
		if (G[u][v] && color[v] == 0)
			dfs(v, n);
	}
	color[u] = 1;
	f[u] = ++t;
}

int main(void)
{
	int n, k, v, u;
	cin >> n;
	for (int i = 0; i < n; i++) {
		cin >> u >> k;
		for (int i = 0; i < k; i++) {
			cin >> v;
			G[u][v] = 1;
		}
	}
	for (int i = 1; i <= n; i++) {
		if (color[i] == 0)
			dfs(i, n);
	}
	for (int i = 1; i <= n; i++) {
		cout << i << " " << d[i] << " " << f[i] << endl;
	}
	return 0;
}

C++: // ALDS1_11_B
#include <bits/stdc++.h>
#define endl "\n"
#define rep(i,n) for(int i=0;i<int(n);i++)
#define SZ(x) ((int)(x).size())
#define all(x) (x).begin(),(x).end()
using namespace std;
typedef long long ll;
template <class T>ostream &operator<<(ostream &o,const vector<T>&v)
{o<<"{";for(int i=0;i<(int)v.size();i++)o<<(i>0?", ":"")<<v[i];o<<"}";return o;}
namespace you {
    std::string to_string(char val) {
        return std::string(1, val);
        // return std::string{val};
        // you::to_string(char)
    }
}

vector<vector<int>> node(101);
vector<int> setu(101);
vector<bool> seen(101,false); 
vector<int> start(101,0);
vector<int> goal(101,0);
int t=0;
void dfs(int x){
    if(seen[x]==true) return;
    seen[x]=true;
    t++;
    start[x]=t;
    rep(i,setu[x]){
        dfs(node[x][i]);
    }
    t++;
    goal[x]=t;
}

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(12);

    int n;
    cin>>n;
    rep(i,n){
        int u,k;
        cin>>u>>k;
        rep(j,k){
            int v;
            cin>>v;
            node[u].push_back(v);
            setu[u]=k;
        }
    }
    for(int i=1;i<=n;i++){
        dfs(i);
    }
    for(int i=1;i<=n;i++){
        cout<<i<<" "<<start[i]<<" "<<goal[i]<<endl;
    }
    return 0;
}