

def   __UpperCAmelCase					(      __a :     Union[str, Any]      )     ->	int:

					"""simple docstring"""

					if not head:
										return True
					# split the list to two parts
					_a ,   _a      :       Optional[Any]   =						head.next, head
					while fast and fast.next:
										_a      :       List[Any]   =						fast.next.next
										_a      :       List[str]   =						slow.next
					_a      :       Any   =						slow.next
					_a      :       Optional[Any]   =						None  # Don't forget here! But forget still works!
					# reverse the second part
					_a      :       Union[str, Any]   =						None
					while second:
										_a      :       Union[str, Any]   =						second.next
										_a      :       List[str]   =						node
										_a      :       Optional[Any]   =						second
										_a      :       List[str]   =						nxt
					# compare two parts
					# second part has the same or one less node
					while node:
										if node.val != head.val:
															return False
										_a      :       Tuple   =						node.next
										_a      :       Any   =						head.next
					return True



def   __UpperCAmelCase					(      __a :     Tuple      )     ->	List[Any]:

					"""simple docstring"""

					if not head or not head.next:
										return True

					# 1. Get the midpoint (slow)
					_a      :       Dict   =						head
					while fast and fast.next:
										_a ,   _a      :       List[Any]   =						fast.next.next, slow.next

					# 2. Push the second half into the stack
					_a      :       Optional[int]   =						[slow.val]
					while slow.next:
										_a      :       Union[str, Any]   =						slow.next
										stack.append(slow.val      )

					# 3. Comparison
					while stack:
										if stack.pop() != cur.val:
															return False
										_a      :       List[Any]   =						cur.next

					return True







def   __UpperCAmelCase					(      __a :     str      )     ->	Optional[int]:

					"""simple docstring"""

					if not head or not head.next:
										return True
					_a      :       Tuple   =						{}
					_a      :       List[Any]   =						0
					while head:
										if head.val in d:
															d[head.val].append(__a      )
										else:
															_a      :       Dict   =						[pos]
										_a      :       Dict   =						head.next
										pos += 1
					_a      :       Any   =						pos - 1
					_a      :       List[str]   =						0
					for v in d.values():
										if len(__a      ) % 2 != 0:
															middle += 1
										else:
															_a      :       Tuple   =						0
															for i in range(0						,len(__a      )      ):
																				if v[i] + v[len(__a      ) - 1 - step] != checksum:
																									return False
																				step += 1
										if middle > 1:
															return False
					return True






import json
import os
import unittest

from transformers import MgpstrTokenizer
from transformers.models.mgp_str.tokenization_mgp_str import VOCAB_FILES_NAMES
from transformers.testing_utils import require_tokenizers

from ...test_tokenization_common import TokenizerTesterMixin

@require_tokenizers
class 							UpperCAmelCase_						(     __lowercase							,			unittest.TestCase  ):
							"""simple docstring"""







							UpperCAmelCase__			:		List[Any]             =       MgpstrTokenizer
							UpperCAmelCase__			:		int             =       False
							UpperCAmelCase__			:		Union[str, Any]             =       {}
							UpperCAmelCase__			:		List[Any]             =       False


							def 							__lowercase							(     self			)       ->       Any:
												super().setUp()

												# fmt: off
												_a      :       Tuple   =						['''[GO]''', '''[s]''', '''0''', '''1''', '''2''', '''3''', '''4''', '''5''', '''6''', '''7''', '''8''', '''9''', '''a''', '''b''', '''c''', '''d''', '''e''', '''f''', '''g''', '''h''', '''i''', '''j''', '''k''', '''l''', '''m''', '''n''', '''o''', '''p''', '''q''', '''r''', '''s''', '''t''', '''u''', '''v''', '''w''', '''x''', '''y''', '''z''']
												# fmt: on
												_a      :       Optional[int]   =						dict(zip(_a			,				range(len(_a			)			)			)			)

												_a      :       Any   =						os.path.join(self.tmpdirname			,				VOCAB_FILES_NAMES['''vocab_file''']			)
												with open(self.vocab_file			,				'''w'''			,				encoding='''utf-8'''			) as fp:
																	fp.write(json.dumps(_a			) + '''\n'''			)


							def 							__lowercase							(     self			,				**_a			)       ->       Dict:
												return MgpstrTokenizer.from_pretrained(self.tmpdirname			,				**_a			)


							def 							__lowercase							(     self			,				_a			)       ->       Tuple:
												_a      :       List[str]   =						'''tester'''
												_a      :       Optional[Any]   =						'''tester'''
												return input_text, output_text


							@unittest.skip('''MGP-STR always lower cases letters.'''			)
							def 							__lowercase							(     self			)       ->       Any:
												pass


							def 							__lowercase							(     self			)       ->       Any:
												_a      :       Union[str, Any]   =						self.get_tokenizers(do_lower_case=_a			)
												for tokenizer in tokenizers:
																	with self.subTest(F"""{tokenizer.__class__.__name__}"""			):
																						_a      :       int   =						'''[SPECIAL_TOKEN]'''

																						tokenizer.add_special_tokens({'''cls_token''': special_token}			)
																						_a      :       Tuple   =						tokenizer.encode([special_token]			,				add_special_tokens=_a			)
																						self.assertEqual(len(_a			)			,				1			)

																						_a      :       Tuple   =						tokenizer.decode(_a			,				skip_special_tokens=_a			)
																						self.assertTrue(special_token not in decoded			)


							def 							__lowercase							(     self			)       ->       Tuple:
												_a      :       List[Any]   =						self.get_tokenizers()
												for tokenizer in tokenizers:
																	with self.subTest(F"""{tokenizer.__class__.__name__}"""			):
																						_a ,   _a      :       int   =						self.get_input_output_texts(_a			)

																						_a      :       List[str]   =						tokenizer.tokenize(_a			)
																						_a      :       Optional[int]   =						tokenizer.convert_tokens_to_ids(_a			)
																						_a      :       Tuple   =						tokenizer.encode(_a			,				add_special_tokens=_a			)
																						self.assertListEqual(_a			,				_a			)

																						_a      :       Optional[int]   =						tokenizer.convert_ids_to_tokens(_a			)
																						self.assertNotEqual(len(_a			)			,				0			)
																						_a      :       int   =						tokenizer.decode(_a			)
																						self.assertIsInstance(_a			,				_a			)

																						self.assertEqual(text_a.replace(''' '''			,				''''''			)			,				_a			)


							@unittest.skip('''MGP-STR tokenizer only handles one sequence.'''			)
							def 							__lowercase							(     self			)       ->       List[str]:
												pass




							@unittest.skip('''inputs cannot be pretokenized in MgpstrTokenizer'''			)
							def 							__lowercase							(     self			)       ->       Optional[Any]:
												pass



