






'''simple docstring'''
from __future__ import annotations

from collections.abc import Iterator
from typing import Any






class      __SCREAMING_SNAKE_CASE      :




 def __init__(      self	:							List[str]					,      __lowercase	:							Any      )	->						Union[str, Any]:
       SCREAMING_SNAKE_CASE__     :				Any									=data
       SCREAMING_SNAKE_CASE__     :				Node | None									=None






class      __SCREAMING_SNAKE_CASE      :




 def __init__(      self	:							List[Any]      )	->						Optional[int]:
       SCREAMING_SNAKE_CASE__     :				List[str]									=None
       SCREAMING_SNAKE_CASE__     :				List[str]									=None




 def __iter__(      self	:							List[str]      )	->						Iterator[Any]:
       SCREAMING_SNAKE_CASE__     :				Tuple									=self.head
       while self.head:
             yield node.data
             SCREAMING_SNAKE_CASE__     :				List[Any]									=node.next
             if node == self.head:
                   break




 def __len__(      self	:							Tuple      )	->						int:
       return sum(1 for _ in self      )




 def __repr__(      self	:							List[str]      )	->						Tuple:
       return "->".join(str(__lowercase      ) for item in iter(self      )      )




 def      __magic_name__	(      self	:							Tuple					,      __lowercase	:							Any      )	->						None:
       self.insert_nth(len(self      )					,      __lowercase      )




 def      __magic_name__	(      self	:							Optional[int]					,      __lowercase	:							Any      )	->						None:
       self.insert_nth(0					,      __lowercase      )




 def      __magic_name__	(      self	:							Any					,      __lowercase	:							int					,      __lowercase	:							Any      )	->						None:
       if index < 0 or index > len(self      ):
             raise IndexError('''list index out of range.'''      )
       SCREAMING_SNAKE_CASE__     :				str									=Node(__lowercase      )
       if self.head is None:
             SCREAMING_SNAKE_CASE__     :				int									=new_node  # first node points itself
             SCREAMING_SNAKE_CASE__     :				str									=new_node
       elif index == 0:  # insert at head
             SCREAMING_SNAKE_CASE__     :				Any									=self.head
             SCREAMING_SNAKE_CASE__     :				str									=new_node
       else:
             SCREAMING_SNAKE_CASE__     :				Any									=self.head
             for _ in range(index - 1      ):
                   SCREAMING_SNAKE_CASE__     :				Optional[Any]									=temp.next
             SCREAMING_SNAKE_CASE__     :				int									=temp.next
             SCREAMING_SNAKE_CASE__     :				Optional[int]									=new_node
             if index == len(self      ) - 1:  # insert at tail
                   SCREAMING_SNAKE_CASE__     :				Dict									=new_node




 def      __magic_name__	(      self	:							List[str]      )	->						Optional[Any]:
       return self.delete_nth(0      )




 def      __magic_name__	(      self	:							List[Any]      )	->						Any:
       return self.delete_nth(len(self      ) - 1      )




 def      __magic_name__	(      self	:							Any					,      __lowercase	:							int = 0      )	->						Any:
       if not 0 <= index < len(self      ):
             raise IndexError('''list index out of range.'''      )
       SCREAMING_SNAKE_CASE__     :				Dict									=self.head
       if self.head == self.tail:  # just one node
             SCREAMING_SNAKE_CASE__     :				List[str]									=None
       elif index == 0:  # delete head node
             SCREAMING_SNAKE_CASE__     :				str									=self.tail.next.next
             SCREAMING_SNAKE_CASE__     :				Any									=self.head.next
       else:
             SCREAMING_SNAKE_CASE__     :				int									=self.head
             for _ in range(index - 1      ):
                   SCREAMING_SNAKE_CASE__     :				List[Any]									=temp.next
             SCREAMING_SNAKE_CASE__     :				Optional[Any]									=temp.next
             SCREAMING_SNAKE_CASE__     :				Union[str, Any]									=temp.next.next
             if index == len(self      ) - 1:  # delete at tail
                   SCREAMING_SNAKE_CASE__     :				Tuple									=temp
       return delete_node.data




 def      __magic_name__	(      self	:							Any      )	->						bool:
       return len(self      ) == 0





def  _a(  ):




      '''simple docstring'''






      SCREAMING_SNAKE_CASE__     :				Any									=CircularLinkedList()
      assert len(UpperCamelCase__							) == 0
      assert circular_linked_list.is_empty() is True
      assert str(UpperCamelCase__							) == ""

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

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

      try:
            circular_linked_list.delete_nth(-1							)
            raise AssertionError
      except IndexError:
            assert True

      try:
            circular_linked_list.delete_nth(0							)
            raise AssertionError
      except IndexError:
            assert True

      assert circular_linked_list.is_empty() is True
      for i in range(5							):
            assert len(UpperCamelCase__							) == i
            circular_linked_list.insert_nth(UpperCamelCase__,	i + 1							)
      assert str(UpperCamelCase__							) == "->".join(str(UpperCamelCase__							) for i in range(1,	6							)							)

      circular_linked_list.insert_tail(6							)
      assert str(UpperCamelCase__							) == "->".join(str(UpperCamelCase__							) for i in range(1,	7							)							)
      circular_linked_list.insert_head(0							)
      assert str(UpperCamelCase__							) == "->".join(str(UpperCamelCase__							) for i in range(0,	7							)							)

      assert circular_linked_list.delete_front() == 0
      assert circular_linked_list.delete_tail() == 6
      assert str(UpperCamelCase__							) == "->".join(str(UpperCamelCase__							) for i in range(1,	6							)							)
      assert circular_linked_list.delete_nth(2							) == 3

      circular_linked_list.insert_nth(2,	3							)
      assert str(UpperCamelCase__							) == "->".join(str(UpperCamelCase__							) for i in range(1,	6							)							)

      assert circular_linked_list.is_empty() is False


if __name__ == "__main__":
  import doctest

  doctest.testmod()







'''simple docstring'''
from __future__ import annotations

import sys
from collections import deque
from typing import Generic, TypeVar

a_					= TypeVar('T')






class      __SCREAMING_SNAKE_CASE      (			Generic[T]				):
 snake_case_  							=							42  # Cache store of keys
 snake_case_  							=							42  # References of the keys in cache
 snake_case_  							=							10  # Maximum capacity of cache




 def __init__(      self	:							Dict					,      __lowercase	:							int      )	->						None:
       SCREAMING_SNAKE_CASE__     :				Any									=deque()
       SCREAMING_SNAKE_CASE__     :				str									=set()
       if not n:
             SCREAMING_SNAKE_CASE__     :				Optional[Any]									=sys.maxsize
       elif n < 0:
             raise ValueError('''n should be an integer greater than 0.'''      )
       else:
             SCREAMING_SNAKE_CASE__     :				Optional[Any]									=n




 def      __magic_name__	(      self	:							List[str]					,      __lowercase	:							T      )	->						None:
       if x not in self.key_reference:
             if len(self.dq_store      ) == LRUCache._MAX_CAPACITY:
                   SCREAMING_SNAKE_CASE__     :				int									=self.dq_store.pop()
                   self.key_reference.remove(__lowercase      )
       else:
             self.dq_store.remove(__lowercase      )

       self.dq_store.appendleft(__lowercase      )
       self.key_reference.add(__lowercase      )




 def      __magic_name__	(      self	:							Union[str, Any]      )	->						None:
       for k in self.dq_store:
             print(__lowercase      )




 def __repr__(      self	:							List[Any]      )	->						str:
       return F"LRUCache({self._MAX_CAPACITY}) => {list(self.dq_store      )}"


if __name__ == "__main__":
  import doctest

  doctest.testmod()

  a_					= LRUCache(4)
  lru_cache.refer('A')
  lru_cache.refer(2)
  lru_cache.refer(3)
  lru_cache.refer('A')
  lru_cache.refer(4)
  lru_cache.refer(5)
  lru_cache.display()

  print(lru_cache)
  assert str(lru_cache) == "LRUCache(4) => [5, 4, 'A', 3]"