
"""simple docstring"""





from __future__ import annotations

from collections.abc import Iterator
from typing import Generic, TypeVar

UpperCamelCase_					:						str				= TypeVar('''T''')






class __lowerCAmelCase				(					Generic[T]      ):




			"""simple docstring"""







			def __init__(				self						:					List[Any]       ,   _snake_case						:					Dict	)      -> Optional[Any]:







								"""simple docstring"""
								A_				 =						data
								A_				 =						None






			def __str__(				self						:					int	)      -> str:







								"""simple docstring"""
								return F'{self.data}'






class __lowerCAmelCase				(					Generic[T]      ):




			"""simple docstring"""







			def __init__(				self						:					List[Any]	)      -> None:







								"""simple docstring"""
								A_				 =						None




			def __iter__(				self						:					Optional[Any]	)      -> Iterator[T]:







								"""simple docstring"""
								A_				 =						self.top
								while node:
													yield node.data
													A_				 =						node.next




			def __str__(				self						:					Dict	)      -> str:







								"""simple docstring"""
								return "->".join([str(__a	) for item in self]	)




			def __len__(				self						:					Tuple	)      -> int:







								"""simple docstring"""
								return len(tuple(iter(self	)	)	)




			def      lowerCamelCase__     (				self						:					Any	)      -> bool:







								"""simple docstring"""
								return self.top is None




			def      lowerCamelCase__     (				self						:					Dict       ,   _snake_case						:					Optional[int]	)      -> None:







								"""simple docstring"""
								A_				 =						Node(__a	)
								if not self.is_empty():
													A_				 =						self.top
								A_				 =						node




			def      lowerCamelCase__     (				self						:					Optional[int]	)      -> T:







								"""simple docstring"""
								if self.is_empty():
													raise IndexError("pop from empty stack"	)
								assert isinstance(self.top       ,   __a	)
								A_				 =						self.top
								A_				 =						self.top.next
								return pop_node.data




			def      lowerCamelCase__     (				self						:					Optional[int]	)      -> T:







								"""simple docstring"""
								if self.is_empty():
													raise IndexError("peek from empty stack"	)

								assert self.top is not None
								return self.top.data






			def      lowerCamelCase__     (				self						:					str	)      -> None:







								"""simple docstring"""
								A_				 =						None


if __name__ == "__main__":
		from doctest import testmod

		testmod()






"""simple docstring"""





def 							A_     (__a				,   __a				,   __a				):

					'''simple docstring'''





					A_				 =						len(__a				)
					A_				 =						[[0] * n for i in range(__a				)]
					for i in range(__a				):
										A_				 =						y_points[i]

					for i in range(2				,   __a				):
										for j in range(__a				,   __a				):
															A_				 =						(
															    (xa - x_points[j - i + 1]) * q[j][i - 1]
															    - (xa - x_points[j]) * q[j - 1][i - 1]
															) / (x_points[j] - x_points[j - i + 1])

					return [q[n - 1][n - 1], q]


if __name__ == "__main__":
		import doctest

		doctest.testmod()




