



"""simple docstring"""






import logging
import os
import threading
import time


try:
		import warnings
except ImportError:
		_lowercase			:			Tuple										=						None

try:
		import msvcrt
except ImportError:
		_lowercase			:			List[str]										=						None

try:
		import fcntl
except ImportError:
		_lowercase			:			Tuple										=						None


# Backward compatibility
# ------------------------------------------------
try:
		TimeoutError
except NameError:
		_lowercase			:			List[str]										=						OSError


# Data
# ------------------------------------------------
_lowercase			:			List[Any]										=						[
    """Timeout""",
    """BaseFileLock""",
    """WindowsFileLock""",
    """UnixFileLock""",
    """SoftFileLock""",
    """FileLock""",
]

_lowercase			:			List[Any]										=						"""3.0.12"""


_lowercase			:			int										=						None






def 					snake_case__       (		):
			"""simple docstring"""
			global _logger
			lowerCamelCase__		:		Union[str, Any]		     =_logger or logging.getLogger(__name__     )
			return _logger

class 	__SCREAMING_SNAKE_CASE     (				__snake_case       ):



					def __init__(	self							:  Optional[Any],  lowerCamelCase							:  List[str]					)-> Any:
								lowerCamelCase__		:		Optional[int]		     =lock_file
								return None




					def __str__(	self							:  Optional[Any]					)-> str:
								lowerCamelCase__		:		Tuple		     =F'''The file lock \'{self.lock_file}\' could not be acquired.'''
								return temp





class 	__SCREAMING_SNAKE_CASE     :



					def __init__(	self							:  str,  lowerCamelCase							:  Dict					)-> Any:
								lowerCamelCase__		:		Optional[Any]		     =lock
								return None



					def __enter__(	self							:  Tuple					)-> List[Any]:
								return self.lock




					def __exit__(	self							:  Optional[int],  lowerCamelCase							:  int,  lowerCamelCase							:  Dict,  lowerCamelCase							:  Tuple					)-> Optional[Any]:
								self.lock.release()
								return None





class 	__SCREAMING_SNAKE_CASE     :



					def __init__(	self							:  Union[str, Any],  lowerCamelCase							:  List[str],  lowerCamelCase							:  Dict=-1,  lowerCamelCase							:  Any=None					)-> int:
								lowerCamelCase__		:		List[Any]		     =max_filename_length if max_filename_length is not None else 255
								# Hash the filename if it's too long
								lowerCamelCase__		:		Dict		     =self.hash_filename_if_too_long(a_,  a_					)
								# The path to the lock file.
								lowerCamelCase__		:		str		     =lock_file

								# The file descriptor for the *_lock_file* as it is returned by the
								# os.open() function.
								# This file lock is only NOT None, if the object currently holds the
								# lock.
								lowerCamelCase__		:		Dict		     =None

								# The default timeout value.
								lowerCamelCase__		:		List[Any]		     =timeout

								# We use this lock primarily for the lock counter.
								lowerCamelCase__		:		Tuple		     =threading.Lock()

								# The lock counter is used for implementing the nested locking
								# mechanism. Whenever the lock is acquired, the counter is increased and
								# the lock is only released, when this value is 0 again.
								lowerCamelCase__		:		Optional[Any]		     =0
								return None



					@property
					def 		snake_case	(	self							:  int					)-> Optional[Any]:
								return self._lock_file



					@property
					def 		snake_case	(	self							:  Tuple					)-> Optional[Any]:
								return self._timeout



					@timeout.setter
					def 		snake_case	(	self							:  int,  lowerCamelCase							:  Any					)-> Any:
								lowerCamelCase__		:		Dict		     =float(a_					)
								return None



					def 		snake_case	(	self							:  int					)-> int:
								raise NotImplementedError()



					def 		snake_case	(	self							:  Optional[Any]					)-> Any:
								raise NotImplementedError()



					@property
					def 		snake_case	(	self							:  Tuple					)-> List[str]:
								return self._lock_file_fd is not None



					def 		snake_case	(	self							:  Tuple,  lowerCamelCase							:  Dict=None,  lowerCamelCase							:  Optional[Any]=0.05					)-> List[str]:

								if timeout is None:
											lowerCamelCase__		:		List[str]		     =self.timeout

								# Increment the number right at the beginning.
								# We can still undo it, if something fails.
								with self._thread_lock:
											self._lock_counter += 1

								lowerCamelCase__		:		Optional[int]		     =id(self					)
								lowerCamelCase__		:		str		     =self._lock_file
								lowerCamelCase__		:		Optional[int]		     =time.time()
								try:
											while True:
														with self._thread_lock:
																	if not self.is_locked:
																				logger().debug(F'''Attempting to acquire lock {lock_id} on {lock_filename}'''					)
																				self._acquire()

														if self.is_locked:
																	logger().debug(F'''Lock {lock_id} acquired on {lock_filename}'''					)
																	break
														elif timeout >= 0 and time.time() - start_time > timeout:
																	logger().debug(F'''Timeout on acquiring lock {lock_id} on {lock_filename}'''					)
																	raise Timeout(self._lock_file					)
														else:
																	logger().debug(
																	    F'''Lock {lock_id} not acquired on {lock_filename}, waiting {poll_intervall} seconds ...'''					)
																	time.sleep(a_					)
								except:  # noqa
											# Something did go wrong, so decrement the counter.
											with self._thread_lock:
														lowerCamelCase__		:		Optional[int]		     =max(0,  self._lock_counter - 1					)

											raise
								return _Acquire_ReturnProxy(lock=self					)



					def 		snake_case	(	self							:  Optional[Any],  lowerCamelCase							:  Optional[int]=False					)-> Tuple:

								with self._thread_lock:
											if self.is_locked:
														self._lock_counter -= 1

														if self._lock_counter == 0 or force:
																	lowerCamelCase__		:		Tuple		     =id(self					)
																	lowerCamelCase__		:		str		     =self._lock_file

																	logger().debug(F'''Attempting to release lock {lock_id} on {lock_filename}'''					)
																	self._release()
																	lowerCamelCase__		:		Dict		     =0
																	logger().debug(F'''Lock {lock_id} released on {lock_filename}'''					)

								return None



					def __enter__(	self							:  Optional[Any]					)-> Any:
								self.acquire()
								return self



					def __exit__(	self							:  List[str],  lowerCamelCase							:  Tuple,  lowerCamelCase							:  int,  lowerCamelCase							:  Optional[int]					)-> List[str]:
								self.release()
								return None



					def __del__(	self							:  List[Any]					)-> Optional[int]:
								self.release(force=a_					)
								return None




					def 		snake_case	(	self							:  str,  lowerCamelCase							:  Optional[int],  lowerCamelCase							:  Dict					)-> Tuple:
								lowerCamelCase__		:		Any		     =os.path.basename(a_					)
								if len(a_					) > max_length and max_length > 0:
											lowerCamelCase__		:		List[Any]		     =os.path.dirname(a_					)
											lowerCamelCase__		:		Any		     =str(hash(a_					)					)
											lowerCamelCase__		:		List[Any]		     =filename[: max_length - len(a_					) - 8] + '''...''' + hashed_filename + '''.lock'''
											return os.path.join(a_,  a_					)
								else:
											return path





class 	__SCREAMING_SNAKE_CASE     (				__snake_case       ):



					def __init__(	self							:  Union[str, Any],  lowerCamelCase							:  Optional[int],  lowerCamelCase							:  Any=-1,  lowerCamelCase							:  Optional[int]=None					)-> Dict:
								from .file_utils import relative_to_absolute_path

								super().__init__(a_,  timeout=a_,  max_filename_length=a_					)
								lowerCamelCase__		:		List[str]		     ='''\\\\?\\''' + relative_to_absolute_path(self.lock_file					)



					def 		snake_case	(	self							:  str					)-> int:
								lowerCamelCase__		:		Optional[Any]		     =os.O_RDWR | os.O_CREAT | os.O_TRUNC

								try:
											lowerCamelCase__		:		Any		     =os.open(self._lock_file,  a_					)
								except OSError:
											pass
								else:
											try:
														msvcrt.locking(a_,  msvcrt.LK_NBLCK,  1					)
											except OSError:
														os.close(a_					)
											else:
														lowerCamelCase__		:		Dict		     =fd
								return None




					def 		snake_case	(	self							:  Optional[Any]					)-> Union[str, Any]:
								lowerCamelCase__		:		Dict		     =self._lock_file_fd
								lowerCamelCase__		:		Dict		     =None
								msvcrt.locking(a_,  msvcrt.LK_UNLCK,  1					)
								os.close(a_					)

								try:
											os.remove(self._lock_file					)
								# Probably another instance of the application
								# that acquired the file lock.
								except OSError:
											pass
								return None





class 	__SCREAMING_SNAKE_CASE     (				__snake_case       ):



					def __init__(	self							:  Tuple,  lowerCamelCase							:  str,  lowerCamelCase							:  str=-1,  lowerCamelCase							:  Tuple=None					)-> Dict:
								lowerCamelCase__		:		Optional[Any]		     =os.statvfs(os.path.dirname(a_					)					).f_namemax
								super().__init__(a_,  timeout=a_,  max_filename_length=a_					)



					def 		snake_case	(	self							:  Tuple					)-> Any:
								lowerCamelCase__		:		Optional[Any]		     =os.O_RDWR | os.O_CREAT | os.O_TRUNC
								lowerCamelCase__		:		List[str]		     =os.open(self._lock_file,  a_					)

								try:
											fcntl.flock(a_,  fcntl.LOCK_EX | fcntl.LOCK_NB					)
								except OSError:
											os.close(a_					)
								else:
											lowerCamelCase__		:		Optional[int]		     =fd
								return None




					def 		snake_case	(	self							:  int					)-> List[str]:
								lowerCamelCase__		:		Dict		     =self._lock_file_fd
								lowerCamelCase__		:		Tuple		     =None
								fcntl.flock(a_,  fcntl.LOCK_UN					)
								os.close(a_					)
								return None





class 	__SCREAMING_SNAKE_CASE     (				__snake_case       ):



					def 		snake_case	(	self							:  List[str]					)-> int:
								lowerCamelCase__		:		Union[str, Any]		     =os.O_WRONLY | os.O_CREAT | os.O_EXCL | os.O_TRUNC
								try:
											lowerCamelCase__		:		Tuple		     =os.open(self._lock_file,  a_					)
								except OSError:
											pass
								else:
											lowerCamelCase__		:		List[Any]		     =fd
								return None




					def 		snake_case	(	self							:  Optional[int]					)-> Tuple:
								os.close(self._lock_file_fd					)
								lowerCamelCase__		:		int		     =None

								try:
											os.remove(self._lock_file					)
								# The file is already deleted and that's what we want.
								except OSError:
											pass
								return None





_lowercase			:			Dict										=						None

if msvcrt:
		_lowercase			:			List[Any]										=						WindowsFileLock
elif fcntl:
		_lowercase			:			List[str]										=						UnixFileLock
else:
		_lowercase			:			str										=						SoftFileLock

		if warnings is not None:
				warnings.warn("only soft file lock is available")









"""simple docstring"""






def 					snake_case__       (		__lowerCamelCase    :   int     ):
			"""simple docstring"""
			lowerCamelCase__		:		List[Any]		     =[0] * len(__lowerCamelCase     )
			lowerCamelCase__		:		List[Any]		     =[]
			lowerCamelCase__		:		List[Any]		     =[1] * len(__lowerCamelCase     )

			for values in graph.values():
						for i in values:
									indegree[i] += 1

			for i in range(len(__lowerCamelCase     )     ):
						if indegree[i] == 0:
									queue.append(__lowerCamelCase     )

			while queue:
						lowerCamelCase__		:		Tuple		     =queue.pop(0     )
						for x in graph[vertex]:
									indegree[x] -= 1

									if long_dist[vertex] + 1 > long_dist[x]:
												lowerCamelCase__		:		Optional[Any]		     =long_dist[vertex] + 1

									if indegree[x] == 0:
												queue.append(__lowerCamelCase     )

			print(max(__lowerCamelCase     )     )


# Adjacency list of Graph
_lowercase			:			Optional[Any]										=						{0: [2, 3, 4], 1: [2, 7], 2: [5], 3: [5, 7], 4: [7], 5: [6], 6: [7], 7: []}

longest_distance(graph)




