



from collections.abc import Iterator, MutableMapping
from dataclasses import dataclass
from typing import Generic, TypeVar

_lowercase    	=		TypeVar("KEY")
_lowercase    	=		TypeVar("VAL")



@dataclass(frozen=A__      ,   slots=A__  )
class      _UpperCAmelCase      (							Generic[KEY, VAL]  ):
     UpperCamelCase__		     =					42
     UpperCamelCase__		     =					42







class      _UpperCAmelCase      (							_Item  ):




     def __init__(					self):
         super().__init__(a__			,    a__)




     def __bool__(					self):
         return False







_lowercase    	=		_DeletedItem()



class      _UpperCAmelCase      (							MutableMapping[KEY, VAL]  ):




     def __init__(					self			,    a__ = 8			,    a__ = 0.7_5):
         A__					=       initial_block_size
         A__					=       [None] * initial_block_size
         assert 0.0 < capacity_factor < 1.0
         A__					=       capacity_factor
         A__					=       0




     def 		snake_case_		(					self			,    a__):
         return hash(a__) % len(self._buckets)




     def 		snake_case_		(					self			,    a__):
         return (ind + 1) % len(self._buckets)




     def 		snake_case_		(					self			,    a__			,    a__			,    a__):
         A__					=       self._buckets[ind]
         if not stored:
             A__					=       _Item(a__			,    a__)
             self._len += 1
             return True
         elif stored.key == key:
             A__					=       _Item(a__			,    a__)
             return True
         else:
             return False




     def 		snake_case_		(					self):
         A__					=       len(self._buckets) * self._capacity_factor
         return len(self) >= int(a__)




     def 		snake_case_		(					self):
         if len(self._buckets) <= self._initial_block_size:
             return False
         A__					=       len(self._buckets) * self._capacity_factor / 2
         return len(self) < limit




     def 		snake_case_		(					self			,    a__):
         A__					=       self._buckets
         A__					=       [None] * new_size
         A__					=       0
         for item in old_buckets:
             if item:
                 self._add_item(item.key			,    item.val)




     def 		snake_case_		(					self):
         self._resize(len(self._buckets) * 2)




     def 		snake_case_		(					self):
         self._resize(len(self._buckets) // 2)




     def 		snake_case_		(					self			,    a__):
         A__					=       self._get_bucket_index(a__)
         for _ in range(len(self._buckets)):
             yield ind
             A__					=       self._get_next_ind(a__)




     def 		snake_case_		(					self			,    a__			,    a__):
         for ind in self._iterate_buckets(a__):
             if self._try_set(a__			,    a__			,    a__):
                 break




     def __setitem__(					self			,    a__			,    a__):
         if self._is_full():
             self._size_up()

         self._add_item(a__			,    a__)




     def __delitem__(					self			,    a__):
         for ind in self._iterate_buckets(a__):
             A__					=       self._buckets[ind]
             if item is None:
                 raise KeyError(a__)
             if item is _deleted:
                 continue
             if item.key == key:
                 A__					=       _deleted
                 self._len -= 1
                 break
         if self._is_sparse():
             self._size_down()




     def __getitem__(					self			,    a__):
         for ind in self._iterate_buckets(a__):
             A__					=       self._buckets[ind]
             if item is None:
                 break
             if item is _deleted:
                 continue
             if item.key == key:
                 return item.val
         raise KeyError(a__)




     def __len__(					self):
         return self._len




     def __iter__(					self):
         yield from (item.key for item in self._buckets if item)




     def __repr__(					self):
         A__					=       ''' ,'''.join(
             F"{item.key}: {item.val}" for item in self._buckets if item)
         return F"HashMap({val_string})"





from __future__ import annotations



def 		lowerCAmelCase__     (       UpperCamelCase_					:							dict			,							UpperCamelCase_					:							str						)->	set[str]:
    A__			,						A__					=       set(UpperCamelCase_						), [start]

    while stack:
        A__					=       stack.pop()
        explored.add(UpperCamelCase_						)
        # Differences from BFS:
        # 1) pop last element instead of first one
        # 2) add adjacent elements to stack without exploring them
        for adj in reversed(graph[v]						):
            if adj not in explored:
                stack.append(UpperCamelCase_						)
    return explored


_lowercase    	=		{
    "A": ["B", "C", "D"],
    "B": ["A", "D", "E"],
    "C": ["A", "F"],
    "D": ["B", "D"],
    "E": ["B", "F"],
    "F": ["C", "E", "G"],
    "G": ["F"],
}

if __name__ == "__main__":
   import doctest

   doctest.testmod()
   print(depth_first_search(G, "A"))
