






def 						A__			(				__lowerCAmelCase		:			str						):






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






						if not head or not head.next:
												return True

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

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

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

						return True





def 						A__			(				__lowerCAmelCase		:			Optional[Any]						):






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









'''simple docstring'''







from __future__ import annotations

import string
from itertools import cycle, product
from pathlib import Path

UpperCamelCase    :      str  			=		(
    string.ascii_letters + string.digits + string.punctuation + string.whitespace
)
UpperCamelCase    :      list[int]  			=		[ord(letter) for letter in string.ascii_lowercase]
UpperCamelCase    :      set[int]  			=		{ord(char) for char in VALID_CHARS}

UpperCamelCase    :      list[str]  			=		["the", "be", "to", "of", "and", "in", "that", "have"]
def 						A__			(				__lowerCAmelCase		:			list[int]   ,    __lowerCAmelCase		:			tuple[int, ...]						):
						lowerCamelCase__         =  ""
						lowerCamelCase__         =  42
						lowerCamelCase__         =  42
						lowerCamelCase__         =  42

						for keychar, cipherchar in zip(cycle(__lowerCAmelCase						)   ,    __lowerCAmelCase						):
												lowerCamelCase__         =  cipherchar ^ keychar
												if decodedchar not in VALID_INTS:
																		return None
												decoded += chr(__lowerCAmelCase						)

						return decoded
def 						A__			(				__lowerCAmelCase		:			list[int]						):
						lowerCamelCase__         =  []
						for key in product(__lowerCAmelCase   ,    repeat=3						):
												lowerCamelCase__         =  try_key(__lowerCAmelCase   ,    __lowerCAmelCase						)
												if encoded is not None:
																		possibles.append(__lowerCAmelCase						)
						return possibles
def 						A__			(				__lowerCAmelCase		:			list[str]   ,    __lowerCAmelCase		:			str						):
						return [possible for possible in possibles if common_word in possible.lower()]
def 						A__			(				__lowerCAmelCase		:			str = "p059_cipher.txt"						):
						lowerCamelCase__         =  42
						lowerCamelCase__         =  42
						lowerCamelCase__         =  42
						lowerCamelCase__         =  42
						lowerCamelCase__         =  Path(__lowerCAmelCase						).parent.joinpath(__lowerCAmelCase						).read_text(encoding="""utf-8"""						)

						lowerCamelCase__         =  [int(__lowerCAmelCase						) for number in data.strip().split(""","""						)]

						lowerCamelCase__         =  filter_valid_chars(__lowerCAmelCase						)
						for common_word in COMMON_WORDS:
												lowerCamelCase__         =  filter_common_word(__lowerCAmelCase   ,    __lowerCAmelCase						)
												if len(__lowerCAmelCase						) == 1:
																		break

						lowerCamelCase__         =  possibles[0]
						return sum(ord(__lowerCAmelCase						) for char in decoded_text						)


if __name__ == "__main__":
							print(F'{solution() = }')

