
"""simple docstring"""
class    _lowerCAmelCase						:



							def __init__(      self ,						a_   )							->							str:
								_UpperCAmelCase =						data
								_UpperCAmelCase =						None
								_UpperCAmelCase =						None



							def __str__(      self   )							->							str:
								return f"{self.data}"





class    _lowerCAmelCase						:



							def __init__(      self   )							->							int:
								_UpperCAmelCase =						None
								_UpperCAmelCase =						None



							def __iter__(      self   )							->							Dict:
								_UpperCAmelCase =						self.head
								while node:
									yield node.data
									_UpperCAmelCase =						node.next



							def __str__(      self   )							->							Dict:
								return "->".join([str(a_   ) for item in self]   )



							def __len__(      self   )							->							Optional[Any]:
								return sum(1 for _ in self   )



							def       _a   (      self ,						a_   )							->							int:
								self.insert_at_nth(0 ,						a_   )



							def       _a   (      self ,						a_   )							->							Union[str, Any]:
								self.insert_at_nth(len(self   ) ,						a_   )



							def       _a   (      self ,						a_ ,						a_   )							->							str:
								_UpperCAmelCase =						len(self   )

								if not 0 <= index <= length:
									raise IndexError("list index out of range"   )
								_UpperCAmelCase =						Node(a_   )
								if self.head is None:
									_UpperCAmelCase =						_UpperCAmelCase =						new_node
								elif index == 0:
									_UpperCAmelCase =						new_node
									_UpperCAmelCase =						self.head
									_UpperCAmelCase =						new_node
								elif index == length:
									_UpperCAmelCase =						new_node
									_UpperCAmelCase =						self.tail
									_UpperCAmelCase =						new_node
								else:
									_UpperCAmelCase =						self.head
									for _ in range(0 ,						a_   ):
										_UpperCAmelCase =						temp.next
									_UpperCAmelCase =						new_node
									_UpperCAmelCase =						temp.previous
									_UpperCAmelCase =						temp
									_UpperCAmelCase =						new_node



							def       _a   (      self   )							->							str:
								return self.delete_at_nth(0   )



							def       _a   (      self   )							->							List[str]:
								return self.delete_at_nth(len(self   ) - 1   )



							def       _a   (      self ,						a_   )							->							Tuple:
								_UpperCAmelCase =						len(self   )

								if not 0 <= index <= length - 1:
									raise IndexError("list index out of range"   )
								_UpperCAmelCase =						self.head  # default first node
								if length == 1:
									_UpperCAmelCase =						_UpperCAmelCase =						None
								elif index == 0:
									_UpperCAmelCase =						self.head.next
									_UpperCAmelCase =						None
								elif index == length - 1:
									_UpperCAmelCase =						self.tail
									_UpperCAmelCase =						self.tail.previous
									_UpperCAmelCase =						None
								else:
									_UpperCAmelCase =						self.head
									for _ in range(0 ,						a_   ):
										_UpperCAmelCase =						temp.next
									_UpperCAmelCase =						temp
									_UpperCAmelCase =						temp.previous
									_UpperCAmelCase =						temp.next
								return delete_node.data



							def       _a   (      self ,						a_   )							->							str:
								_UpperCAmelCase =						self.head

								while current.data != data:  # Find the position to delete
									if current.next:
										_UpperCAmelCase =						current.next
									else:  # We have reached the end an no value matches
										raise ValueError("No data matching given value"   )

								if current == self.head:
									self.delete_head()

								elif current == self.tail:
									self.delete_tail()

								else:  # Before: 1 <--> 2(current) <--> 3
									_UpperCAmelCase =						current.next  # 1 --> 3
									_UpperCAmelCase =						current.previous  # 1 <--> 3
								return data



							def       _a   (      self   )							->							Optional[int]:
								return len(self   ) == 0





def     __lowerCamelCase  (		):


	"""simple docstring"""






	_UpperCAmelCase =						DoublyLinkedList()
	assert linked_list.is_empty() is True
	assert str(UpperCamelCase__      ) == ""

	try:
		linked_list.delete_head()
		raise AssertionError  # This should not happen.
	except IndexError:
		assert True  # This should happen.

	try:
		linked_list.delete_tail()
		raise AssertionError  # This should not happen.
	except IndexError:
		assert True  # This should happen.

	for i in range(10      ):
		assert len(UpperCamelCase__      ) == i
		linked_list.insert_at_nth(UpperCamelCase__				,     i + 1      )
	assert str(UpperCamelCase__      ) == "->".join(str(UpperCamelCase__      ) for i in range(1				,     11      )      )

	linked_list.insert_at_head(0      )
	linked_list.insert_at_tail(11      )
	assert str(UpperCamelCase__      ) == "->".join(str(UpperCamelCase__      ) for i in range(0				,     12      )      )

	assert linked_list.delete_head() == 0
	assert linked_list.delete_at_nth(9      ) == 10
	assert linked_list.delete_tail() == 11
	assert len(UpperCamelCase__      ) == 9
	assert str(UpperCamelCase__      ) == "->".join(str(UpperCamelCase__      ) for i in range(1				,     10      )      )


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

			testmod()






"""simple docstring"""
from .stack import Stack




def     __lowerCamelCase  (		UpperCamelCase__      ):


	"""simple docstring"""






	_UpperCAmelCase =						Stack()
	_UpperCAmelCase =						{"(": ")", "[": "]", "{": "}"}
	for bracket in parentheses:
		if bracket in bracket_pairs:
			stack.push(UpperCamelCase__      )
		elif bracket in (")", "]", "}"):
			if stack.is_empty() or bracket_pairs[stack.pop()] != bracket:
				return False
	return stack.is_empty()


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

			testmod()

			__magic_name__		       =				['''((()))''', '''((())''', '''(()))''']
			print('''Balanced parentheses demonstration:\n''')
			for example in examples:
						__magic_name__		       =				'''''' if balanced_parentheses(example) else '''not '''
						print(f'''{example} is {not_str}balanced''')




