Go: package main

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

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

	nVerts := scanInt(sc)
	graph := make([][]int, nVerts+1)

	for i := 0; i < nVerts; i++ {
		u := scanInt(sc)
		nDegrees := scanInt(sc)

		graph[u] = make([]int, nDegrees)
		for d := 0; d < nDegrees; d++ {
			graph[u][d] = scanInt(sc)
		}
	}

	starts := make([]int, nVerts+1)
	ends := make([]int, nVerts+1)
	time := 1

	var dfs func(u int)
	dfs = func(u int) {
		if starts[u] > 0 {
			return
		}

		starts[u] = time
		time += 1

		for _, v := range graph[u] {
			dfs(v)
		}

		ends[u] = time
		time += 1
	}

	for i := 1; i <= nVerts; i++ {
		dfs(i)
	}

	w := bufio.NewWriter(os.Stdout)
	for i := 1; i <= nVerts; i++ {
		fmt.Fprintf(w, "%d %d %d\n", i, starts[i], ends[i])
	}
	w.Flush()
}

func scanInt(sc *bufio.Scanner) int {
	sc.Scan()
	v, _ := strconv.Atoi(sc.Text())
	return v
}

Python: # coding: utf-8
# Your code here!

n = int(input())
M = []
for i in range(n):
    adj = list(map(int,input().split()))
    if adj[1] == 0:
        M += [[]]
    else:
        M += [adj[2:]]
time = 1
ans = [[j+1,0,0] for j in range(n)] # id d f

while True:
    for i in range(n):
        if ans[i][1] == 0:
            stack = [i]
            ans[i][1] = time
            time += 1
            break
        elif i == n-1:
            for k in range(n):
                print(*ans[k])
            exit()
    while stack != []:
        u = stack[-1]
        if M[u] != []:
            for i in range(len(M[u])):
                v = M[u][0]
                M[u].remove(v)
                if ans[v-1][1] == 0:
                    ans[v-1][1] = time
                    stack.append(v-1)
                    time += 1
                    break
        else:
            stack.pop()
            ans[u][2] = time
            time += 1

Python: n=int(input())
G=[]
for i in range(n):
    L=list(map(int,input().split()))
    G.append(L[2:])
    for j in range(len(G[-1])):
        G[-1][j]-=1

Forder=[-1]*n
Lorder=[-1]*n
ptr=1
def dfs(v):
    #print(v)
    #print(G[v])
    #print()
    global ptr

    Forder[v]=ptr
    ptr+=1

    for next in G[v]:
        if Forder[next]!=-1:
            continue
        dfs(next)
    
    Lorder[v]=ptr
    ptr+=1

#while True:
#    #print(Forder,Lorder)
#    for i in range(n):
#        if Forder[i]!=-1 and Lorder[i]!=-1:
#            pass
#        else:
#            dfs(i)
#            continue
#
#        if i==n-1:
#            break
#    else:
#        continue
#    break
#
#for i in range(n):
#    print(i+1,Forder[i],Lorder[i])

##########
for i in range(n):
    if Forder[i]==-1 or Lorder[i]==-1:
        dfs(i)

for i in range(n):
    print(i+1,Forder[i],Lorder[i])

Python: n = int(input())
Adj = [[0 for i in range(n)] for i in range(n)]
 
for i in range(n):
    u = list(map(int, input().split()))
    if u[1] > 0:
        for i in u[2: 2 + u[1]]:
            Adj[u[0] - 1][i - 1] = 1
 
color = [0] * n
d = [0] * n
f = [0] * n
time = 0
def dfs(u):
    global time
    color[u - 1] = 1
    time += 1
    d[u - 1] = time
    for i in range(1, n+1):
        if Adj[u - 1][i - 1] == 1 and color[i - 1] == 0:
            dfs(i)
    color[u - 1] = 2
    time += 1
    f[u - 1] = time

for i in range(1, n+1):
    if color[i-1] == 0:
        dfs(i)
for i in range(n):
    print("{} {} {}".format(i+1,d[i],f[i]))

Python: def dfs(u, colors, matrix, time, detect_time, finished_time):
    # ????????????????????¨??????????????????
    colors = colors
    detect_time = detect_time
    finished_time = finished_time
    time = time + 1
    stack = list()
    stack.append(u)
    colors[u] = 1
    detect_time[u] = time
    while len(stack):
        for i, val in enumerate(matrix[u]):
            if i == 2 and val == 1:
                print('tanaka')
            if val == 1 and colors[i] == 0:
                time += 1
                stack.append(i)
                colors[i] = 1
                detect_time[i] = time
                u = i
                break
        else:
            time += 1
            e = stack.pop()
            colors[e] = 2
            finished_time[e] = time
            if len(stack):
                u = stack[-1]
    return time


if __name__ == '__main__':
    N = int(input())
    matrix = [[0] * N for _ in range(N)]
    color = [0] * N
    for i in matrix:
        node_info = [int(i) for i in input().split()]
        node_i = node_info[0] - 1
        if not node_info[1] == 0:
            for i in node_info[2:]:
                matrix[node_i][i - 1] = 1
    colors = [0] * len(matrix)
    detect_time = [0] * len(matrix)
    finished_time = [0] * len(matrix)
    time = 0
    for i, val in enumerate(colors):
        if val == 0:
            time = dfs(i, colors, matrix, time, detect_time, finished_time)

    for i in range(len(matrix)):
        print('{} {} {}'.format(i + 1, detect_time[i], finished_time[i]))

Python: j = 1
def dfs(graph, start, result, visited=None):
    global j
    if visited == None:
        visited = []
    visited.append(start)
    result[start][1]  = j
    for next in graph[start][2:]:
        if next in visited:
            continue
        j += 1
        dfs(graph, next, result, visited)
    else:
        j += 1
        result[start][2] = j

n = int(input())
g = [[]]
r = [[i,0,0] for i in range(n + 1)]

for i in range(n):
    g.append(list(map(int, input().split())))
dfs(g,1,r)
for i in range(1,n+1):
    print(*r[i])

Python: def dfs(v, cnt):
    D[v] = cnt
    cnt += 1
    for c in edge[v]:
        if D[c] == -1:
            cnt = dfs(c, cnt)
    F[v] = cnt
    cnt += 1
    return cnt

V = int(input())
edge = [[] for _ in range(V)]
for _ in range(V):
    u, _, *v = map(lambda x: int(x)-1, input().split())
    edge[u] = sorted(v)
D, F = [-1] * V, [-1] * V
c = 1
for i in range(V):
    if D[i] == -1:
        c = dfs(i, c)
for i, (d, f) in enumerate(zip(D, F)):
    print(i+1, d, f)

Python: n = int(input())
Adj = [[0]]
for _ in range(n):
    Adj.append(list(map(int, input().split()))[2:])

visited = [False]*(n+1)
s = [0]*(n+1)
f = [0]*(n+1)
time = 0

def dfs(i):
    global time
    time += 1
    s[i] = time
    visited[i] = True
    for j in Adj[i]:
        if not visited[j]:
            dfs(j)
    time += 1
    f[i] = time

while not all(visited[1:]):
    i = visited[1:].index(False) + 1
    dfs(i)

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

Python: # -*- coding:utf-8 -*-

def solve():
    from collections import deque

    N = int(input())
    Us = [[] for _ in range(N)]

    for i in range(N):
        _in = list(map(int, input().split()))
        if len(_in) == 2:
            continue
        u, k, Vs = _in[0], _in[1], _in[2:]
        Vs.sort()
        for v in Vs:
            Us[u-1].append(v-1)
        Us[u-1] = deque(Us[u-1])

    find = [0 for _ in range(N)]  # 発見時刻
    terminated = [0 for _ in range(N)]  # 終了時刻
    tim = [0]  # 経過時間

    def dfs(now):
        while Us[now]:
            nxt = Us[now].popleft()

            if find[nxt] != 0:
                continue

            tim[0] += 1
            find[nxt] = tim[0]

            dfs(nxt)

        if terminated[now] == 0:
            tim[0] += 1
            terminated[now] = tim[0]

    for i in range(N):
        if find[i] == 0:
            tim[0] += 1
            find[i] = tim[0]
            dfs(i)

    for i in range(N):
        print(i+1, find[i], terminated[i])


if __name__ == "__main__":
    solve()