






'''simple docstring'''





from collections import deque

def _UpperCAmelCase   (	a						:	int ):
							snake_case__	  =       len(a )
							snake_case__	  =       deque()
							snake_case__	  =       [False for _ in range(a )]
							snake_case__	  =       [-1 for _ in range(a )]
							snake_case__	  =       index_of[:]

							def strong_connect(a						:	Tuple  ,					a						:	List[Any]  ,					a						:	int ):
														snake_case__	  =       index  # the number when this node is seen
														snake_case__	  =       index  # lowest rank node reachable from here
														index += 1
														stack.append(a )
														snake_case__	  =       True

														for w in g[v]:
																					if index_of[w] == -1:
																												snake_case__	  =       strong_connect(a  ,					a  ,					a )
																												snake_case__	  =       (
																												    lowlink_of[w] if lowlink_of[w] < lowlink_of[v] else lowlink_of[v]
																												)
																					elif on_stack[w]:
																												snake_case__	  =       (
																												    lowlink_of[w] if lowlink_of[w] < lowlink_of[v] else lowlink_of[v]
																												)

														if lowlink_of[v] == index_of[v]:
																					snake_case__	  =       []
																					snake_case__	  =       stack.pop()
																					snake_case__	  =       False
																					component.append(a )
																					while w != v:
																												snake_case__	  =       stack.pop()
																												snake_case__	  =       False
																												component.append(a )
																					components.append(a )
														return index

							snake_case__	  =       []
							for v in range(a ):
														if index_of[v] == -1:
																					strong_connect(a  ,					0  ,					a )

							return components

def _UpperCAmelCase   (	a						:	Optional[Any]  ,					a						:	str ):
							snake_case__	  =       [[] for _ in range(a )]
							for u, v in edges:
														g[u].append(a )
							return g


if __name__ == "__main__":
	# Test
	a__       =     7
	a__       =     [0, 0, 1, 2, 3, 3, 4, 4, 6]
	a__       =     [1, 3, 2, 0, 1, 4, 5, 6, 5]
	a__       =     [(u, v) for u, v in zip(source, target)]
	a__       =     create_graph(n_vertices, edges)

	assert [[5], [6], [4], [3, 2, 1, 0]] == tarjan(g)








import os
import time

import pytest

from datasets.utils.filelock import FileLock, Timeout

def _UpperCAmelCase   (	a						:	List[Any] ):
							snake_case__	  =       FileLock(str(tmpdir / """foo.lock""" ) )
							snake_case__	  =       FileLock(str(tmpdir / """foo.lock""" ) )
							snake_case__	  =       0.01
							with locka.acquire():
														with pytest.raises(a ):
																					snake_case__	  =       time.time()
																					locka.acquire(a )
																					assert time.time() - _start > timeout



def _UpperCAmelCase   (	a						:	str ):
							snake_case__	  =       """a""" * 1000 + """.lock"""
							snake_case__	  =       FileLock(str(tmpdir / filename ) )
							assert locka._lock_file.endswith(""".lock""" )
							assert not locka._lock_file.endswith(a )
							assert len(os.path.basename(locka._lock_file ) ) <= 255
							snake_case__	  =       FileLock(tmpdir / filename )
							with locka.acquire():
														with pytest.raises(a ):
																					locka.acquire(0 )
