Go: package main

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

/***************************************************************
stackによる深さ優先探索を実装する。
***************************************************************/

const (
	N     = 100
	WHITE = 0
	GRAY  = 1
	BLACK = 2
)

var (
	n            int
	Adj          [N][N]int
	statusColor  [N]int
	discoverTime [N]int
	finishTime   [N]int
	clock        int
	nt           [N]int
)

/***************************************************************
Stackの定義:
- field
	container: ノードの格納されたスライス
	sp: スタックポインタ
- method
	size(): スタックに積まれているノードの個数を返す
	top(): スタックの一番上に積まれているノードを返す
	isEmpty(): スタックが空かどうかを返す
	pop(): スタックの要素をポップし削除する
	push(): スタックに要素を積む
***************************************************************/

type Stack struct {
	container []int
	sp        int
}

func (s *Stack) size() int {
	return len(s.container)
}

func (s *Stack) top() int {
	return s.container[s.sp]
}

func (s *Stack) isEmpty() bool {
	return s.sp == 0
}

func (s *Stack) pop() int {
	_pop := func() {
		s.container = s.container[:len(s.container)-1]
	}
	defer _pop()
	if s.isEmpty() {
		panic("There is no elements in stack!")
	}
	s.sp--
	return s.container[s.sp]
}

func (s *Stack) push(n int) {
	s.sp++
	s.container[s.sp] = n
}

func next(u int) int {
	for v := nt[u]; v < n; v++ {
		nt[u] = v + 1
		if Adj[u][v] == 1 {
			return v
		}
	}
	return -1
}

func _DFS(target int) {
	for i := 0; i < n; i++ {
		nt[i] = 0
	}
	stack := new(Stack)
	stack.container = make([]int, N+1)
	stack.push(target)
	statusColor[target] = GRAY
	clock++
	discoverTime[target] = clock
	for !stack.isEmpty() {
		u := stack.top()
		v := next(u)
		if v != -1 {
			if statusColor[v] == WHITE {
				statusColor[v] = GRAY
				clock++
				discoverTime[v] = clock
				stack.push(v)
			}
		} else {
			stack.pop()
			statusColor[u] = BLACK
			clock++
			finishTime[u] = clock
		}
	}
}

func DFS() {
	for i := 0; i < n; i++ {
		statusColor[i] = WHITE
		nt[i] = 0
	}
	clock = 0
	for i := 0; i < n; i++ {
		if statusColor[i] == WHITE {
			_DFS(i)
		}
	}
	for i := 0; i < n; i++ {
		fmt.Printf("%d %d %d\n", i+1, discoverTime[i], finishTime[i])
	}
}

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	scanner.Split(bufio.ScanWords)
	scanner.Scan()
	n, _ = strconv.Atoi(scanner.Text())
	for i := 0; i < n; i++ {
		for j := 0; j < n; j++ {
			Adj[i][j] = 0
		}
	}
	for i := 0; i < n; i++ {
		scanner.Scan()
		u, _ := strconv.Atoi(scanner.Text())
		scanner.Scan()
		k, _ := strconv.Atoi(scanner.Text())
		u--
		for j := 0; j < k; j++ {
			scanner.Scan()
			v, _ := strconv.Atoi(scanner.Text())
			v--
			Adj[u][v] = 1
		}
	}

	DFS()
}

Python: # -*- coding: utf-8 -*-
# 標準入力を取得
n = int(input())
G = {}
for _ in range(n):
    g = list(map(int, input().split()))
    G[g[0]] = g[2:]

# 求解処理
seen = [False for _ in range(n)]
ans = []


def dfs(v: int) -> None:
    seen[v - 1] = True
    ans.append(v)

    for w in G[v]:
        if not seen[w - 1]:
            dfs(w)

    ans.append(v)


while sum(seen) != n:
    v = seen.index(False)
    dfs(v + 1)

d = [-1 for _ in range(n)]
f = [-1 for _ in range(n)]

for i, a in enumerate(ans):
    if d[a - 1] == -1:
        d[a - 1] = i + 1
    else:
        f[a - 1] = i + 1

for id in range(n):
    print(id + 1, d[id], f[id])

Python: # coding=utf-8

n = int(input())
first_v = 0
time = 0
L = []
d = [None for _ in range(n)]
f = [None for _ in range(n)]
stuck = []
for _ in range(n):
    u, k, *v = map(int, input().split())
    L.append(list(map(lambda x: x-1, v)))

v = first_v #??¢?´¢????????????
while True:
    """print("------------------------------")
    print("stuck:", *stuck)
    print("L:", L)
    print("d:", *d)
    print("f:", *f)
    print("time:", time)
    print("v:", v)"""
    if len(L[v]) > 0:
        stuck.append(v)
        if not d[v]:
            time += 1
            d[v] = time
        v = L[v].pop(0)
    elif len(stuck) > 0:
        if not d[v]:
            time += 1
            d[v] = time
        if not f[v]:
            time += 1
            f[v] = time
        v = stuck.pop(-1)
    else:
        time += 1
        f[first_v] = time
        if None in d:
            first_v = d.index(None)
            v = first_v
        else:
            break

for i in range(n):
    print("{} {} {}".format(i+1, d[i], f[i]))

Python: # coding: UTF-8
from collections import deque
n = int(input())
arrow = {}
visited = set()
d = {}
f = {}


for i in range(n):
  raw = list(map(int,input().split()))
  #print(raw)
  u = raw.pop(0)
  k = raw.pop(0)
  raw.sort()
  q = deque(raw)
  arrow[u] = q
  d[u] = -1
  f[u] = -1

def dfslocal(v,t,arrow,f,d):
  t += 1
  d[v] = t
  visited.add(v)
  #print("First visit to " + str(v) + " at " + str(t) + "!")
  while arrow[v]:
    k = arrow[v].popleft()
    if k not in visited:
      
      t = dfslocal(k,t,arrow,f,d)
  f[v] = t+1
  return t+1

def dfsglobal(arrow,f,d):
  t = 0
  for u in range(n):
    if u+1 not in visited:
      t = dfslocal(u+1,t,arrow,f,d)
  return t

t = dfsglobal(arrow,f,d)

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

Python: def dfs(n):
    global t
    S[n] = t
    DP[n]=1
    for i in A[n][2:]:
        if not DP[i]:
            t += 1
            dfs(i)
    t += 1
    F[n] = t
n = int(input())
d = deque()
A = [0]*(n+1)
S = [0]*(n+1)
F = [0]*(n+1)
DP = [0]*(n+1)
for i in range(n):
    A[i+1] = [int(i) for i in input().split()]
t = 1
dfs(1)
for i in range(1,n+1):
    tmp = "{} {} {}".format(i,S[i],F[i])
    print(tmp)

Python: import sys
sys.setrecursionlimit(10**6)
input = sys.stdin.readline

global time
time = 0

def dfs(u: int, visited: list, d: list, f: list, M: list, n: int):
    global time
    visited[u] = True
    time += 1
    d[u] = time
    for j in range(n):
        if M[u][j] == 1 and not visited[j]:
            dfs(j, visited, d, f, M, n)
    time += 1
    f[u] += time

def main():
    n = int(input())
    visited = [False] * n
    M = [[0]*n for _ in range(n)]
    for _ in range(n):
        a = list(map(int, input().split()))
        for i in range(a[1]):
            M[a[0]-1][a[i+2]-1] = 1
    d = [0] * n
    f = [0] * n
    for i in range(n):
        if not visited[i]:
            dfs(i, visited, d, f, M, n)
    for i in range(n):
        print(i+1, d[i], f[i])

if __name__ == '__main__': main()

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

d = [0] * n
f = [0] * n
isDiscovered = [False] * n
time_stamp = 0

def dfs(x):
    global time_stamp
    isDiscovered [x] = True
    time_stamp = time_stamp + 1
    d[x] = time_stamp
    for i in range(n):
        if a[x][i] == 1 and isDiscovered[i] == False:
            dfs(i)
    time_stamp = time_stamp + 1
    f[x] = time_stamp

for i in range(n):
    if isDiscovered[i] == False:
        dfs(i)

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

Python: #連結グラフではない
n = int(input())
V = [[] for _ in range(n+1)]
for _ in range(n):
    inpt = list(map(int,input().split( )))
    if len(inpt)>2:
        V[inpt[0]] = inpt[2:]


D = [0]*(n+1)
F = [0]*(n+1)

time = 1
Q = [1]
D[0] = -1
D[1] = 1
while len(Q) > 0 or 0 in D[1:]:
    v = Q[-1]
    remains = False
    for i in V[v]:
        if D[i] == 0:
            D[i] = time+1
            Q.append(i)
            remains = True
            break
    if not remains:
        F[v] = time+1
        Q.pop()
        
    time += 1
    if len(Q) == 0:
        if 0 in D:
            time += 1
            nxt = D.index(0)
            Q.append(nxt)
            D[nxt] = time
        else:
            pass
        

for i in range(1,n+1):
    print(i,D[i],F[i])