'''simple docstring'''


from __future__ import annotations

from collections.abc import Iterator
from typing import Any






class 	__SCREAMING_SNAKE_CASE		:







  '''simple docstring'''






  def __init__(					self ,						snake_case_		):




       '''simple docstring'''

       UpperCAmelCase_				:  Any  = data
       UpperCAmelCase_				:  Node | None  = None






  def __str__(					self		):




       '''simple docstring'''

       return F'''{self.data}'''







class 	__SCREAMING_SNAKE_CASE		:







  '''simple docstring'''






  def __init__(					self		):




       '''simple docstring'''

       UpperCAmelCase_				:  Node | None  = None
       UpperCAmelCase_				:  Node | None  = None


  def __iter__(					self		):




       '''simple docstring'''

       UpperCAmelCase_				:  List[Any]  = self.front
       while node:
            yield node.data
            UpperCAmelCase_				:  Union[str, Any]  = node.next


  def __len__(					self		):




       '''simple docstring'''

       return len(tuple(iter(self		)		)		)


  def __str__(					self		):




       '''simple docstring'''

       return " <- ".join(str(snake_case_		) for item in self		)


  def _UpperCamelCase	(					self		):




       '''simple docstring'''

       return len(self		) == 0


  def _UpperCamelCase	(					self ,						snake_case_		):




       '''simple docstring'''

       UpperCAmelCase_				:  Union[str, Any]  = Node(snake_case_		)
       if self.is_empty():
            UpperCAmelCase_				:  Optional[int]  = node
       else:
            assert isinstance(self.rear ,						snake_case_		)
            UpperCAmelCase_				:  Union[str, Any]  = node
            UpperCAmelCase_				:  Any  = node


  def _UpperCamelCase	(					self		):




       '''simple docstring'''

       if self.is_empty():
            raise IndexError('dequeue from empty queue'		)
       assert isinstance(self.front ,						snake_case_		)
       UpperCAmelCase_				:  Dict  = self.front
       UpperCAmelCase_				:  List[Any]  = self.front.next
       if self.front is None:
            UpperCAmelCase_				:  Any  = None
       return node.data






  def _UpperCamelCase	(					self		):




       '''simple docstring'''

       UpperCAmelCase_				:  str  = None


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

 testmod()












from .stack import Stack


def   A		(__A  :       str			)  -> bool:







     """simple docstring"""


     UpperCAmelCase_		=				Stack()
     UpperCAmelCase_		=				{'''(''': ''')''', '''[''': ''']''', '''{''': '''}'''}
     for bracket in parentheses:
          if bracket in bracket_pairs:
               stack.push(__A			)
          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()

    snake_case_					:					Dict       						=			["((()))", "((())", "(()))"]
    print("Balanced parentheses demonstration:\n")
    for example in examples:
        snake_case_					:					Optional[int]       						=			"" if balanced_parentheses(example) else "not "
        print(f"{example} is {not_str}balanced")






