Go: #include <bits/stdc++.h>
using namespace std;
static const int WHITE = 0;
static const int GRAY  = 1;
static const int BLACK = 2;
static const int N     = 100;

int n, tt;
vector<vector<int>> M(N, vector<int>(N));
vector<int> color(N), d(N), f(N);

void dfs_visit(int u) {
  color[u] = GRAY;
  d[u]     = ++tt;
  for (int v = 0; v < n; v++) {
    if (M[u][v] == 0) continue;
    if (color[v] == WHITE) { dfs_visit(v); }
  }
  color[u] = BLACK;
  f[u]     = ++tt;
}

void dfs() {
  tt = 0;

  for (int u = 0; u < n; u++) {
    if (color[u] == WHITE) dfs_visit(u);
  }
  for (int u = 0; u < n; u++) {
    printf("%d %d %d\n", u + 1, d[u], f[u]);
  }
}

int main() {
  int u, v, k;
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> u >> k;
    u--;
    for (int j = 0; j < k; j++) {
      cin >> v;
      v--;
      M[u][v] = 1;
    }
  }

  dfs();
}

Python: NOT_FOUND = 0
FOUND = 1
FINISHED = 2


class Stack(object):
    def __init__(self):
        self._stack = []

    def push(self, val):
        self._stack.append(val)

    def pop(self):
        val = self._stack[-1]
        del self._stack[-1]
        return val

    def top(self):
        if len(self._stack) > 0:
            return self._stack[-1]
        else:
            return None

    def is_stacked(self, val):
        if len(self._stack) > 0:
            return val in self._stack
        else:
            return None

    def get_len(self):
        return len(self._stack)


def parse_line(line):
    vals = [int(v) for v in line.split(' ')]
    node, n_node, nodes = vals[0], vals[1], vals[2:]
    # convert zero origin
    nodes = [n - 1 for n in nodes]
    return node, n_node, nodes


def main():
    # get input
    n = int(input().strip())
    graph = []
    for _ in range(n):
        line = input().strip()
        _, _, nodes = parse_line(line)
        graph.append(nodes)

    # initialize
    stack = Stack()
    stats = [NOT_FOUND for _ in range(n)]
    found_times = [None for _ in range(n)]
    finished_times = [None for _ in range(n)]
    counter = 0

    # dfs
    while sum(stats) < n * FINISHED:
        counter += 1
        init_node = None
        for node in range(n):
            if stats[node] == NOT_FOUND:
                init_node = node
                break
        assert init_node is not None
        stack.push(init_node)
        stats[init_node] = FOUND
        found_times[init_node] = counter

        while stack.get_len() > 0:
            counter += 1
            crr_node = stack.top()
            adj_nodes = graph[crr_node]
            for adj_node in adj_nodes:
                # exist not stacked node
                if stats[adj_node] == NOT_FOUND:
                    found_times[adj_node] = counter
                    stats[adj_node] = FOUND
                    stack.push(adj_node)
                    crr_node = adj_node
                    break
            else:
                # not exist not stacked node
                finished_times[crr_node] = counter
                stats[crr_node] = FINISHED
                stack.pop()
                crr_node = stack.top()

    for i in range(n):
        print('{} {} {}'.format(i + 1, found_times[i], finished_times[i]))


if __name__ == '__main__':
    main()

Python: import sys
input = sys.stdin.readline
from collections import deque

n = int(input())
graph = {i: deque() for i in range(1, 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)
        #graph[i].append(u)

seen = [0]*(n+1)
stack = []
time = 0
seentime = [0]*(n+1)
donetime = [0]*(n+1)

def dfs(j):
    global time
    seen[j] = 1
    time += 1
    seentime[j] = time
    stack.append(j)
    while stack:
        s = stack[-1]
        if not graph[s]:
            stack.pop()
            time += 1
            donetime[s] = time
            continue
        g_NO  = graph[s].popleft()
        if seen[g_NO]:
            continue
        seen[g_NO] = 1
        stack.append(g_NO)
        time += 1
        seentime[g_NO] = time

for j in range(1, n+1):
    if seen[j]:
        continue
    dfs(j)

for k, a, b in zip(range(1, n+1), seentime[1:], donetime[1:]):
    print(k, a, b)

Python: n = int(input())
g = []
for i in range(n):
    a = list(map(int,input().split()))
    g.append(a[2:])
d = [0]*n
f = [0]*n
global t
t = 0

def find(x):
    global t
    if len(g[x-1]) == 0:
        t += 1
        f[x-1] = t
    else:
        for i in g[x-1]:
            if d[i-1] == 0:
                t += 1
                d[i-1] = t
                find(i)
        t += 1
        f[x-1] = t

for i in range(n):
    if d[i] == 0:
        t += 1
        d[i] = t
        find(i+1)
for i in range(n):
    print(i+1, d[i], f[i])

Python: n=0
t=1
def adjacent_matrix():
    global n
    n=int(input())
    v=[]
    array=[]
    for i in range(n):
        zero=[0 for i in range(n)]
        a=list(map(int,input().split()))
        a=a[2:]
        for j in a:
            zero[j-1]=1
        array.append(zero)
    return array
def dfs(array,i,d,f):
    global t
    if i == n:
        return
    else:
        if(d[i] == 0):
            d[i] = t
            t += 1
            for (j,x) in enumerate(array[i]):
                if x == 1:
                    dfs(array,j,d,f)
            f[i] = t
            t += 1
    return 


def main():
    array=adjacent_matrix()
    print()
    d=[0 for i in range(n)]
    f=[0 for i in range(n)]
    for i in range(n):
        dfs(array,i,d,f)
    for i in range(n):
        print("{} {} {} ".format(i+1,d[i],f[i]))

if __name__ == "__main__":
    main()

Python: n=int(input())

l=[[0 for i in range(n)] for j in range(n)]##静的確保 隣接行列
d=[0 for i in range(n)]##発見
f=[0 for i in range(n)]##完了
stack=[]##スタック
check=[]

for i in range(n):
    p=[int(x) for x in input().split()]
    
    for j in range(n):
        if j+1 in p[2:]:
            l[i][j]=1
##print("---隣接行列---")
##print(l)

time=1


while len(check)<n:
    for i in range(n):
        if i+1 not in check:
            stack+=[i+1]
            d[i]=time
            break
        else: pass

    while len(stack)!=0:
        ##print("----------while---------")
        for i in range(n):
            if l[stack[-1]-1][i]==1 and not i+1 in check and stack[-1]-1!=i:
                time+=1
                d[i]=time
                stack+=[i+1]

               ## print("stack:",stack)
               ## print("check:",check)
               ## print("d[",i,"]:",d[i])
                break
            elif i==n-1:
##最深    
                check+=[stack[-1]]
                time+=1
                f[stack.pop()-1]=time

               ## print("f[",i,"]:",f[i])
               ## print("check:",check)
    time+=1

Python: #!/usr/bin/python3

def find(A, id, V, time):
    i = id - 1
    A[i][0] = True
    A[i][1] = time
    time += 1
    for v in V[i]:
        if A[v - 1][0] == False:
            time = find(A, v, V, time)
    A[i][2] = time
    time += 1
    return time

n = int(input())
# [isFind, d, f]
A = [[False, 0, 0] for i in range(n)]
U = []
V = []
for i in range(n):
    l = list(map(int, input().split()))
    U.append(l[0])
    V.append(l[2:])

find(A, 1, V, 1)
for u in U:
    l = [u]
    l.extend(A[u - 1][1:])
    print(' '.join(map(str, l)))