Go: package main

import (
	"fmt"
)

func main() {
	var n int
	fmt.Scan(&n)
	g := make([][]int, n+1)
	for i := 0; i < n; i++ {
		var u,k int
		fmt.Scan(&u)
		fmt.Scan(&k)
		g[u] = make([]int, k)
		for j := 0; j < k; j++ {
			fmt.Scan(&g[u][j])
		}
	}

	d := make([]int, n+1)
	f := make([]int, n+1)
	dfs(&g, &d, &f, 1, 1)

	for i := 1; i <= n; i++ {
		fmt.Printf("%d %d %d\n", i, d[i], f[i])
	}
}

func dfs(g *[][]int, d *[]int, f *[]int, id int, t int) int {
	if (*d)[id] > 0 {
		return t
	}
	(*d)[id] = t
	t += 1
	for i := 0; i < len((*g)[id]); i++ {
		t = dfs(g, d, f, (*g)[id][i], t)
	}
	(*f)[id] = t
	return t+1
}

Python: n = int(input())

from collections import deque

graph = [deque([]) for _ in range(n+1)]

for _ in range(n):
    u, k, *v = [int(x) for x in input().split()]

    v.sort()
    for i in v:
        graph[u].append(i)
    
arrive = [-1 for i in range(n+1)]
finish = [-1 for i in range(n+1)]

times = 0

def dfs(v):
    global times
    times += 1
    arrive[v] = times
    stack = [v]
    
    while stack:
        v = stack[-1]
        if graph[v]:
            w = graph[v].popleft()
            if arrive[w] == -1:
                times += 1
                arrive[w] = times
                stack.append(w)
        else:
            times += 1
            finish[v] = times
            stack.pop()
    return

for i in range(n):
    if arrive[i+1] == -1:
        dfs(i+1)

for j in range(n):
    tmp = [j+1, arrive[j+1], finish[j+1]]
    print(*tmp)

Python: n=int(input())
G=[[j for j in range(n)] for i in range(n)]
for i in range(n):
    g_in=list(map(int,input().split()))
    u=g_in[0]
    k=g_in[1]
    v=g_in[2:]
    for j in v:
        G[u-1][j-1]=1

visited=[0 for i in range(n)]
finished=[0 for i in range(n)]
L=[]
out=[[i+1,0,0] for i in range(n)]
step=0

def dfs(cn):
    flg=0
    if visited[cn]==0:
        flg=1
        L.append(cn)
    visited[cn]=1
    for i in range(n):
        if cn!=i and G[cn][i]==1 and visited[i]==0:
            dfs(i)
    if flg==1:
        L.append(cn)

i=0
while visited.count(1)<n:
    dfs(i)
    i+=1
copied=[0 for i in range(len(L))]

for i in range(len(L)):
    if copied[L[i]]==0:
        copied[L[i]]=1
        out[L[i]][1]=i+1
    elif copied[L[i]]==1:
        copied[L[i]]=2
        out[L[i]][2]=i+1

out=[' '.join(map(str,i)) for i in out]
#print(' '.join(map(str,[i+1 for i in L])))
print('\n'.join(map(str,out)))

Python: import sys
u=[]
k=[]
v=[]

time = 0

n=int(sys.stdin.readline().strip())
yattayatu=[False for i in range(n)]

s=[0 for i in range(n)]
f=[0 for i in range(n)]

for i in range(n):
	inp = sys.stdin.readline().strip().split(" ")
	inp = list(map(lambda x: int(x), inp))
	u.append(inp[0])
	k.append(inp[1])
	v.append(inp[2:])


def func(nodeid):
	global time
	if(yattayatu[nodeid-1]==True):
		return
	time += 1
	s[nodeid-1] = time
	for i in range(k[nodeid-1]):
		func(v[nodeid-1][i])
	time +=1
	f[nodeid-1]=time
	yattayatu[nodeid-1]=True

func(1)

for i in range(n):
	print(str(i+1)+" "+str(s[i])+" "+str(f[i]))

Python: def dfs(G, u, t, d, visited):
  found = t
  visited.add(u)
  t += 1
  for v in G[u]:
    if v not in visited:
      t = dfs(G, v, t, d, visited)
  complete = t
  d[u] = (found, complete)
  t+=1
  return t


n = int(input())
G = {}
for _ in range(n):
  entries = list(map(int, input().split(' ')))
  u = entries[0]
  k = entries[1]
  G[u] = set()
  for v in entries[2:]:
    G[u].add(v)


d = {}
dfs(G, 1, 1, d, set())
for i in sorted(d):
  print(i,d[i][0],d[i][1])

Python: n = int(input())
a = []
for i in range(n):
    a += [list(map(int, input().split()))[2:]]
cnt = 1
pre = [0]*n
aft = [0]*n
color = [0]*n
def dfs(s):
    global cnt
    pre[s-1] = cnt
    cnt += 1
    color[s-1] = 1
    for i in a[s-1]:
        if color[i-1] == 0:dfs(i)
    aft[s-1] = cnt
    cnt += 1

for i in range(n):
    if color[i] == 0:
        dfs(i+1)

for i in range(n):
    print(i+1, pre[i], aft[i])

Python: #coding: utf-8

n = int(input())
color = ["white" for i in range(n)]
d = [[] for i in range(n)]
global t
t = 0
M = [[False for i in range(n)] for j in range(n)]
for i in range(n):
    data = list(map(int,input().split()))
    u = data[0]
    k = data[1]
    if i == 0:
        start = u
    for v in data[2:2+k]:
        M[u-1][v-1] = True


def search(u,t):
    t += 1
    color[u-1] = "gray"
    d[u-1].append(t)
    for v in range(1,n+1):
        if M[u-1][v-1] and color[v-1] == "white":
            t = search(v,t)
    color[u-1] = "black"
    t += 1
    d[u-1].append(t)
    return t

t = search(start, t)
for i in range(1,n+1):
    if color[i-1] == "white":
        t = search(i, t)

for i in range(n):
    print(i+1, d[i][0], d[i][1])

Python: def DPS(graph,vertex,dis_time,fin_time,tmp_time):
    dis_time[vertex]=tmp_time[0]
    for i in range(len(graph[0])):
        if(graph[vertex][i] !=0 and dis_time[i]==0):#枝先の頂点が探索済みでなかったら、
            tmp_time[0]+=1
            DPS(graph,i,dis_time,fin_time,tmp_time)
    
    if(dis_time[vertex]==tmp_time[0]):#vertexから、どの頂点に対しても調査が進まなかったら
        tmp_time[0]+=1
    fin_time[vertex]=tmp_time[0]
    tmp_time[0]+=1



#グラフの作成
n=int(input())
graph=[[0]*n for loop in range(n)]
for loop in range(n):
    tmp_ope=list(map(int,input().split()))
    for j in range(tmp_ope[1]):
        graph[tmp_ope[0]-1][tmp_ope[j+2]-1]=1


dis_time=[0]*n
fin_time=[0]*n
tmp_time=[1]
for i in range(n):
    if(dis_time[i]==0):
        DPS(graph,i,dis_time,fin_time,tmp_time)

for i in range(n):
    print(f"{i+1} {dis_time[i]} {fin_time[i]}")

Python: cnt = 1
def dep(G,s_cnt,f_cnt,np):
    global cnt
    s_cnt[np] = cnt
    cnt += 1
    for i in range(n):
        if G[np][i] == 1 and s_cnt[i] == 0:
            dep(G,s_cnt,f_cnt,i)
    f_cnt[np] = cnt
    cnt += 1
    

n = int(input())
G = [[0 for i in range(n)] for j in range(n)]
s_cnt = [0 for i in range(n)]
f_cnt = [0 for i in range(n)]

for i in range(n):
    S = list(map(int, input().split()))
    tmp_n = S[1]
    for j in range(tmp_n):
        G[i][S[j+2]-1] = 1
        
for i in range(n):
    if s_cnt[i]==0:
        dep(G,s_cnt,f_cnt,i)

for i in range(n):
    print(i+1,s_cnt[i],f_cnt[i])

Python: n = int(input())
graph = [[] for _ in range(n)]
for i in range(n):
    in_list = list(map(int, input().split()))
    u = in_list[0]
    graph[u - 1] = in_list[2:]

d = [0 for _ in range(n)]
f = [0 for _ in range(n)]
time = 0


def dfs(now, prev, graph, d, f):
    global time
    time += 1
    d[now] = time
    if not graph[now]:
        f[now] = time + 1
        time += 1
        return
    for k in graph[now]:
        if k - 1 == prev or d[k-1] !=0:
            continue
        dfs(k - 1, now, graph, d, f)
    else:
        time += 1
        f[now] = time
    return d, f


d, f = dfs(0, 0, graph, d, f)
for i in range(1, n + 1):
    print(i, d[i - 1], f[i - 1])

Python: from collections import defaultdict as dd

N = int(input())
graph = dd(list)
seen = dd(int)
u = []
d, f = dd(int), dd(int)
ts = 1
for _ in range(N):
  info = list(map(int, input().split()))
  u.append(info[0])
  graph[info[0]] = info[2:]

def dfs(v):
  global ts
  d[v] = ts
  ts += 1
  
  seen[v] = 1
  for next_v in graph[v]:
    if seen[next_v]:
      continue
    dfs(next_v)
  
  f[v] = ts
  ts += 1

for key in u:
  if seen[key]:
    continue
  dfs(key)

for id in u:
  print("{} {} {}".format(id, d[id], f[id]))