






def _UpperCAmelCase   (	a						:	Optional[int] ):
							if not head:
														return True
							# split the list to two parts
							snake_case__  , snake_case__	  =       head.next, head
							while fast and fast.next:
														snake_case__	  =       fast.next.next
														snake_case__	  =       slow.next
							snake_case__	  =       slow.next
							snake_case__	  =       None  # Don't forget here! But forget still works!
							# reverse the second part
							snake_case__	  =       None
							while second:
														snake_case__	  =       second.next
														snake_case__	  =       node
														snake_case__	  =       second
														snake_case__	  =       nxt
							# compare two parts
							# second part has the same or one less node
							while node:
														if node.val != head.val:
																					return False
														snake_case__	  =       node.next
														snake_case__	  =       head.next
							return True

def _UpperCAmelCase   (	a						:	Optional[int] ):
							if not head or not head.next:
														return True

							# 1. Get the midpoint (slow)
							snake_case__	  =       snake_case__	  =       snake_case__	  =       head
							while fast and fast.next:
														snake_case__  , snake_case__	  =       fast.next.next, slow.next

							# 2. Push the second half into the stack
							snake_case__	  =       [slow.val]
							while slow.next:
														snake_case__	  =       slow.next
														stack.append(slow.val )

							# 3. Comparison
							while stack:
														if stack.pop() != cur.val:
																					return False
														snake_case__	  =       cur.next

							return True



def _UpperCAmelCase   (	a						:	Dict ):
							if not head or not head.next:
														return True
							snake_case__	  =       {}
							snake_case__	  =       0
							while head:
														if head.val in d:
																					d[head.val].append(a )
														else:
																					snake_case__	  =       [pos]
														snake_case__	  =       head.next
														pos += 1
							snake_case__	  =       pos - 1
							snake_case__	  =       0
							for v in d.values():
														if len(a ) % 2 != 0:
																					middle += 1
														else:
																					snake_case__	  =       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








from typing import TYPE_CHECKING

# rely on isort to merge the imports
from ...utils import OptionalDependencyNotAvailable, _LazyModule, is_torch_available


a__       =     {
    """configuration_autoformer""": [
        """AUTOFORMER_PRETRAINED_CONFIG_ARCHIVE_MAP""",
        """AutoformerConfig""",
    ],
}

try:
	if not is_torch_available():
		raise OptionalDependencyNotAvailable()
except OptionalDependencyNotAvailable:
	pass
else:
	a__       =     [
	    """AUTOFORMER_PRETRAINED_MODEL_ARCHIVE_LIST""",
	    """AutoformerForPrediction""",
	    """AutoformerModel""",
	    """AutoformerPreTrainedModel""",
	]


if TYPE_CHECKING:
	from .configuration_autoformer import (
	    AUTOFORMER_PRETRAINED_CONFIG_ARCHIVE_MAP,
	    AutoformerConfig,
	)

	try:
		if not is_torch_available():
			raise OptionalDependencyNotAvailable()
	except OptionalDependencyNotAvailable:
		pass
	else:
		from .modeling_autoformer import (
		    AUTOFORMER_PRETRAINED_MODEL_ARCHIVE_LIST,
		    AutoformerForPrediction,
		    AutoformerModel,
		    AutoformerPreTrainedModel,
		)

else:
	import sys

	a__       =     _LazyModule(__name__, globals()["""__file__"""], _import_structure, module_spec=__spec__)
