


"""simple docstring"""







import importlib.metadata
import operator
import re
import sys
from typing import Optional

from packaging import version


a__				:							str						=     {
    '''<''': operator.lt,
    '''<=''': operator.le,
    '''==''': operator.eq,
    '''!=''': operator.ne,
    '''>=''': operator.ge,
    '''>''': operator.gt,
}




def    UpperCAmelCase__       (lowerCAmelCase_  ,						lowerCAmelCase_  ,						lowerCAmelCase_  ,						lowerCAmelCase_  ,						lowerCAmelCase_  ,						lowerCAmelCase_   ):




					'''simple docstring'''


					if got_ver is None or want_ver is None:
										raise ValueError(
										    f"""Unable to compare versions for {requirement}: need={want_ver} found={got_ver}. This is unusual. Consider"""
										    f""" reinstalling {pkg}."""   )
					if not ops[op](version.parse(lowerCAmelCase_   )  ,						version.parse(lowerCAmelCase_   )   ):
										raise ImportError(
										    f"""{requirement} is required for a normal functioning of this module, but found {pkg}=={got_ver}.{hint}"""   )




def    UpperCAmelCase__       (lowerCAmelCase_  ,						lowerCAmelCase_ = None   ):




					'''simple docstring'''


					__SCREAMING_SNAKE_CASE						   =				f"""\n{hint}""" if hint is not None else ""

					# non-versioned check
					if re.match(R"^[\w_\-\d]+$"  ,						lowerCAmelCase_   ):
										__SCREAMING_SNAKE_CASE   ,  __SCREAMING_SNAKE_CASE   ,  __SCREAMING_SNAKE_CASE						   =				requirement, None, None
					else:
										__SCREAMING_SNAKE_CASE						   =				re.findall(R"^([^!=<>\s]+)([\s!=<>]{1,2}.+)"  ,						lowerCAmelCase_   )
										if not match:
															raise ValueError(
															    "requirement needs to be in the pip package format, .e.g., package_a==1.23, or package_b>=1.23, but"
															    f""" got {requirement}"""   )
										__SCREAMING_SNAKE_CASE   ,  __SCREAMING_SNAKE_CASE						   =				match[0]
										__SCREAMING_SNAKE_CASE						   =				want_full.split(","   )  # there could be multiple requirements
										__SCREAMING_SNAKE_CASE						   =				{}
										for w in want_range:
															__SCREAMING_SNAKE_CASE						   =				re.findall(R"^([\s!=<>]{1,2})(.+)"  ,						lowerCAmelCase_   )
															if not match:
																				raise ValueError(
																				    "requirement needs to be in the pip package format, .e.g., package_a==1.23, or package_b>=1.23,"
																				    f""" but got {requirement}"""   )
															__SCREAMING_SNAKE_CASE   ,  __SCREAMING_SNAKE_CASE						   =				match[0]
															__SCREAMING_SNAKE_CASE						   =				want_ver
															if op not in ops:
																				raise ValueError(f"""{requirement}: need one of {list(ops.keys()   )}, but got {op}"""   )

    # special case
					if pkg == "python":
										__SCREAMING_SNAKE_CASE						   =				".".join([str(lowerCAmelCase_   ) for x in sys.version_info[:3]]   )
										for op, want_ver in wanted.items():
															_compare_versions(lowerCAmelCase_  ,						lowerCAmelCase_  ,						lowerCAmelCase_  ,						lowerCAmelCase_  ,						lowerCAmelCase_  ,						lowerCAmelCase_   )
										return

					# check if any version is installed
					try:
										__SCREAMING_SNAKE_CASE						   =				importlib.metadata.version(lowerCAmelCase_   )
					except importlib.metadata.PackageNotFoundError:
										raise importlib.metadata.PackageNotFoundError(
										    f"""The '{requirement}' distribution was not found and is required by this application. {hint}"""   )

					# check that the right version is installed if version number or a range was provided
					if want_ver is not None:
										for op, want_ver in wanted.items():
															_compare_versions(lowerCAmelCase_  ,						lowerCAmelCase_  ,						lowerCAmelCase_  ,						lowerCAmelCase_  ,						lowerCAmelCase_  ,						lowerCAmelCase_   )




def    UpperCAmelCase__       (lowerCAmelCase_   ):




					'''simple docstring'''


					__SCREAMING_SNAKE_CASE						   =				"Try: pip install transformers -U or pip install -e '.[dev]' if you're working with git main"
					return require_version(lowerCAmelCase_  ,						lowerCAmelCase_   )


"""simple docstring"""





class     _UpperCAmelCase:



		def __init__(					self)       ->       Optional[Any]:






							'''simple docstring'''
							_UpperCamelCase							 =  {}



		def 						UpperCAmelCase							(					self)       ->       None:






							'''simple docstring'''
							print(self.vertex)
							for i in self.vertex:
												print(__a				,		''' -> '''				,		''' -> '''.join([str(__a) for j in self.vertex[i]]))



		def 						UpperCAmelCase							(					self				,		__a				,		__a)       ->       None:






							'''simple docstring'''
							# check if vertex is already present,
							if from_vertex in self.vertex:
												self.vertex[from_vertex].append(__a)
							else:
												# else make a new vertex
												_UpperCamelCase							 =  [to_vertex]



		def 						UpperCAmelCase							(					self)       ->       None:






							'''simple docstring'''
							# visited array for storing already visited nodes
							_UpperCamelCase							 =  [False] * len(self.vertex)

							# call the recursive helper function
							for i in range(len(self.vertex)):
												if not visited[i]:
																	self.dfs_recursive(__a				,		__a)




		def 						UpperCAmelCase							(					self				,		__a				,		__a)       ->       None:






							'''simple docstring'''
							# mark start vertex as visited
							_UpperCamelCase							 =  True

							print(__a				,		end=''' ''')

							# Recur for all the vertices that are adjacent to this node
							for i in self.vertex:
												if not visited[i]:
																	self.dfs_recursive(__a				,		__a)


if __name__ == "__main__":
				_a														=		Graph()
				g.add_edge(0, 1)
				g.add_edge(0, 2)
				g.add_edge(1, 2)
				g.add_edge(2, 0)
				g.add_edge(2, 3)
				g.add_edge(3, 3)

				g.print_graph()
				print("""DFS:""")
				g.dfs()

				# OUTPUT:
				# 0  ->  1 -> 2
				# 1  ->  2
				# 2  ->  0 -> 3
				# 3  ->  3
				# DFS:
				#  0 1 2 3






