



"""simple docstring"""
from __future__ import annotations





def    __magic_name__ (							lowercase							,	lowercase       ):
   SCREAMING_SNAKE_CASE_:       Optional[Any]   	=position
   SCREAMING_SNAKE_CASE_:       List[str]   	=[
       (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),
   ]
   SCREAMING_SNAKE_CASE_:       List[str]   	=[]

   for position in positions:
      SCREAMING_SNAKE_CASE_:       Tuple   	=position
      if 0 <= y_test < n and 0 <= x_test < n:
         permissible_positions.append(__lowerCamelCase       )

   return permissible_positions





def    __magic_name__ (							lowercase       ):
   return not any(elem == 0 for row in board for elem in row       )





def    __magic_name__ (							lowercase							,	lowercase							,	lowercase       ):

   if is_complete(__lowerCamelCase       ):
      return True

   for position in get_valid_pos(__lowerCamelCase							,	len(__lowerCamelCase       )       ):
      SCREAMING_SNAKE_CASE_:       Union[str, Any]   	=position

      if board[y][x] == 0:
         SCREAMING_SNAKE_CASE_:       str   	=curr + 1
         if open_knight_tour_helper(__lowerCamelCase							,	__lowerCamelCase							,	curr + 1       ):
            return True
         SCREAMING_SNAKE_CASE_:       Any   	=0

   return False





def    __magic_name__ (							lowercase       ):
   SCREAMING_SNAKE_CASE_:       Tuple   	=[[0 for i in range(__lowerCamelCase       )] for j in range(__lowerCamelCase       )]

   for i in range(__lowerCamelCase       ):
      for j in range(__lowerCamelCase       ):
         SCREAMING_SNAKE_CASE_:       Union[str, Any]   	=1
         if open_knight_tour_helper(__lowerCamelCase							,	(i, j)							,	1       ):
            return board
         SCREAMING_SNAKE_CASE_:       str   	=0

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


if __name__ == "__main__":
   import doctest

   doctest.testmod()








"""simple docstring"""






from __future__ import annotations

_lowercase : Dict      						=						1.6_021E-19  # units = C






def      snake_case__   (		__lowerCamelCase				:    float							,		__lowerCamelCase				:    float							,		__lowerCamelCase				:    float							,		):
			"""simple docstring"""
			if (conductivity, electron_conc, mobility).count(0	) != 1:
						raise ValueError('''You cannot supply more or less than 2 values'''	)
			elif conductivity < 0:
						raise ValueError('''Conductivity cannot be negative'''	)
			elif electron_conc < 0:
						raise ValueError('''Electron concentration cannot be negative'''	)
			elif mobility < 0:
						raise ValueError('''mobility cannot be negative'''	)
			elif conductivity == 0:
						return (
						    "conductivity",
						    mobility * electron_conc * ELECTRON_CHARGE,
						)
			elif electron_conc == 0:
						return (
						    "electron_conc",
						    conductivity / (mobility * ELECTRON_CHARGE),
						)
			else:
						return (
						    "mobility",
						    conductivity / (electron_conc * ELECTRON_CHARGE),
						)


if __name__ == "__main__":
		import doctest

		doctest.testmod()




