



'''simple docstring'''
from dataclasses import dataclass
from typing import Callable, Optional

import datasets



@dataclass
class _A  (    datasets.BuilderConfig    ):
		_SCREAMING_SNAKE_CASE					:    Optional[Callable]						      =			None
		_SCREAMING_SNAKE_CASE					:    Optional[dict]						      =			None
		_SCREAMING_SNAKE_CASE					:    Optional[datasets.Features]						      =			None





		def 							__A       (     self				)       ->     Any:

					'''simple docstring'''
					assert self.generator is not None, "generator must be specified"

					if self.gen_kwargs is None:
								__UpperCAmelCase   :      Tuple										=     {}



class _A  (    datasets.GeneratorBasedBuilder    ):
		_SCREAMING_SNAKE_CASE					:    List[str]						      =			GeneratorConfig





		def 							__A       (     self				)       ->     Any:

					'''simple docstring'''
					return datasets.DatasetInfo(features=self.config.features				)





		def 							__A       (     self ,       __UpperCAmelCase				)       ->     Optional[Any]:

					'''simple docstring'''
					return [datasets.SplitGenerator(name=datasets.Split.TRAIN ,       gen_kwargs=self.config.gen_kwargs				)]





		def 							__A       (     self ,       **__UpperCAmelCase				)       ->     List[str]:

					'''simple docstring'''
					for idx, ex in enumerate(self.config.generator(**__UpperCAmelCase				)				):
								yield idx, ex









'''simple docstring'''
from __future__ import annotations

from typing import Any



class _A  :





		def __init__(     self ,       __UpperCAmelCase ,       __UpperCAmelCase				)       ->     None:  # noqa: A002

					'''simple docstring'''
					__UpperCAmelCase   :      Tuple										=     item
					__UpperCAmelCase   :      str										=     next



class _A  :





		def __init__(     self				)       ->     None:

					'''simple docstring'''
					__UpperCAmelCase   :      Node | None										=     None
					__UpperCAmelCase   :      Optional[int]										=     0





		def 							__A       (     self ,       __UpperCAmelCase				)       ->     None:

					'''simple docstring'''
					__UpperCAmelCase   :      Optional[Any]										=     Node(__UpperCAmelCase ,       self.head				)
					self.size += 1





		def 							__A       (     self				)       ->     Any:

					'''simple docstring'''
					# Switched 'self.is_empty()' to 'self.head is None'
					# because mypy was considering the possibility that 'self.head'
					# can be None in below else part and giving error
					if self.head is None:
								return None
					else:
								__UpperCAmelCase   :      str										=     self.head.item
								__UpperCAmelCase   :      Tuple										=     self.head.next
								self.size -= 1
								return item





		def 							__A       (     self				)       ->     bool:

					'''simple docstring'''
					return self.head is None





		def __str__(     self				)       ->     str:

					'''simple docstring'''
					if self.is_empty():
								return ""
					else:
								__UpperCAmelCase   :      Union[str, Any]										=     self.head
								__UpperCAmelCase   :      List[Any]										=     """"""
								__UpperCAmelCase   :      list[str]										=     []
								while iterate:
											item_list.append(str(iterate.item				)				)
											__UpperCAmelCase   :      Any										=     iterate.next

								__UpperCAmelCase   :      Dict										=     """ --> """.join(__UpperCAmelCase				)

								return item_str





		def __len__(     self				)       ->     int:

					'''simple docstring'''
					return self.size




