




from __future__ import annotations







def        lowerCAmelCase_			(  snake_case_,snake_case_  ):
   _A							:  Union[str, Any]    =		position
   _A							:  Dict    =		[
       (y + 1, x + 2),
       (y - 1, x + 2),
       (y + 1, x - 2),
       (y - 1, x - 2),
       (y + 2, x + 1),
       (y + 2, x - 1),
       (y - 2, x + 1),
       (y - 2, x - 1),
   ]
   _A							:  int    =		[]

   for position in positions:
      _A							:  Optional[int]    =		position
      if 0 <= y_test < n and 0 <= x_test < n:
         permissible_positions.append(snake_case_  )

   return permissible_positions







def        lowerCAmelCase_			(  snake_case_  ):
   return not any(elem == 0 for row in board for elem in row  )







def        lowerCAmelCase_			(  snake_case_,snake_case_,snake_case_  ):

   if is_complete(snake_case_  ):
      return True

   for position in get_valid_pos(snake_case_,len(snake_case_  )  ):
      _A							:  List[Any]    =		position

      if board[y][x] == 0:
         _A							:  Tuple    =		curr + 1
         if open_knight_tour_helper(snake_case_,snake_case_,curr + 1  ):
            return True
         _A							:  int    =		0

   return False







def        lowerCAmelCase_			(  snake_case_  ):
   _A							:  int    =		[[0 for i in range(snake_case_  )] for j in range(snake_case_  )]

   for i in range(snake_case_  ):
      for j in range(snake_case_  ):
         _A							:  int    =		1
         if open_knight_tour_helper(snake_case_,(i, j),1  ):
            return board
         _A							:  List[str]    =		0

   _A							:  List[str]    =		f'''Open Kight Tour cannot be performed on a board of size {n}'''
   raise ValueError(snake_case_  )


if __name__ == "__main__":
  import doctest

  doctest.testmod()







from __future__ import annotations







class 		lowercase							:

     def __init__(						self	,  _a = 0       )		->							str:
           _A							:  Any    =		key

     def       a__			(						self	,  _a	,  _a       )		->							list[str]:
           assert isinstance(_a	,  _a       ) and isinstance(_a	,  _a       )

           _A							:  Any    =		key or self.__key or 1

           # make sure key is an appropriate size
           key %= 255

           return [chr(ord(_a       ) ^ key       ) for ch in content]

     def       a__			(						self	,  _a	,  _a       )		->							list[str]:
           assert isinstance(_a	,  _a       ) and isinstance(_a	,  _a       )

           _A							:  List[Any]    =		key or self.__key or 1

           # make sure key is an appropriate size
           key %= 255

           return [chr(ord(_a       ) ^ key       ) for ch in content]

     def       a__			(						self	,  _a	,  _a = 0       )		->							str:
           assert isinstance(_a	,  _a       ) and isinstance(_a	,  _a       )

           _A							:  List[Any]    =		key or self.__key or 1

           # make sure key can be any size
           while key > 255:
                 key -= 255

           # This will be returned
           _A							:  List[str]    =		""""""

           for ch in content:
                 ans += chr(ord(_a       ) ^ key       )

           return ans

     def       a__			(						self	,  _a	,  _a = 0       )		->							str:
           assert isinstance(_a	,  _a       ) and isinstance(_a	,  _a       )

           _A							:  List[str]    =		key or self.__key or 1

           # make sure key can be any size
           while key > 255:
                 key -= 255

           # This will be returned
           _A							:  List[str]    =		""""""

           for ch in content:
                 ans += chr(ord(_a       ) ^ key       )

           return ans

     def       a__			(						self	,  _a	,  _a = 0       )		->							bool:
           assert isinstance(_a	,  _a       ) and isinstance(_a	,  _a       )

           try:
                 with open(_a       ) as fin, open("""encrypt.out"""	,  """w+"""       ) as fout:
                       # actual encrypt-process
                       for line in fin:
                             fout.write(self.encrypt_string(_a	,  _a       )       )

           except OSError:
                 return False

           return True



     def       a__			(						self	,  _a	,  _a       )		->							bool:
           assert isinstance(_a	,  _a       ) and isinstance(_a	,  _a       )

           try:
                 with open(_a       ) as fin, open("""decrypt.out"""	,  """w+"""       ) as fout:
                       # actual encrypt-process
                       for line in fin:
                             fout.write(self.decrypt_string(_a	,  _a       )       )

           except OSError:
                 return False

           return True


# Tests
# crypt = XORCipher()
# key = 67

# # test encrypt
# print(crypt.encrypt("hallo welt",key))
# # test decrypt
# print(crypt.decrypt(crypt.encrypt("hallo welt",key), key))

# # test encrypt_string
# print(crypt.encrypt_string("hallo welt",key))

# # test decrypt_string
# print(crypt.decrypt_string(crypt.encrypt_string("hallo welt",key),key))

# if (crypt.encrypt_file("test.txt",key)):
#       print("encrypt successful")
# else:
#       print("encrypt unsuccessful")

# if (crypt.decrypt_file("encrypt.out",key)):
#       print("decrypt successful")
# else:
#       print("decrypt unsuccessful")

