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

from typing import Generic, TypeVar

A__ :		int					=TypeVar('T')







class 			__A					(			Generic[T]      ):
 def __init__( self      :     Any					, lowerCamelCase      :     T							):



   """simple docstring"""





   __A		:  Any       				=		data  # Assign data
   __A		:  Node[T] | None       				=		None  # Initialize next as null
   __A		:  Node[T] | None       				=		None  # Initialize prev as null







class 			__A					(			Generic[T]      ):
 def __init__( self      :     Any							):



   """simple docstring"""





   __A		:  Node[T] | None       				=		None
 def 		lowercase_( self      :     int					, lowerCamelCase      :     T							):



   """simple docstring"""





   if self.head is None:
     __A		:  Dict       				=		Node(lowerCamelCase							)
   else:
     __A		:  Dict       				=		Node(lowerCamelCase							)
     __A		:  List[Any]       				=		new_node
     __A		:  List[Any]       				=		self.head
     __A		:  Any       				=		None
     __A		:  List[Any]       				=		new_node
 def 		lowercase_( self      :     Dict							):



   """simple docstring"""





   if self.head is None:
     return None
   else:
     assert self.head is not None
     __A		:  Optional[Any]       				=		self.head.data
     __A		:  Optional[int]       				=		self.head.next
     if self.head is not None:
       __A		:  List[str]       				=		None
     return temp
 def 		lowercase_( self      :     Any							):



   """simple docstring"""





   return self.head.data if self.head is not None else None
 def __len__( self      :     Optional[int]							):



   """simple docstring"""





   __A		:  Dict       				=		self.head
   __A		:  Union[str, Any]       				=		0
   while temp is not None:
     count += 1
     __A		:  Tuple       				=		temp.next
   return count
 def 		lowercase_( self      :     List[Any]							):



   """simple docstring"""





   return self.head is None






 def 		lowercase_( self      :     List[str]							):



   """simple docstring"""





   print("""stack elements are:"""							)
   __A		:  List[Any]       				=		self.head
   while temp is not None:
     print(temp.data					, end="""->"""							)
     __A		:  Tuple       				=		temp.next


# Code execution starts here
if __name__ == "__main__":
     # Start with the empty stack
     A__ :		Stack[int]					=Stack()

     # Insert 4 at the beginning. So stack becomes 4->None
     print('Stack operations using Doubly LinkedList')
     stack.push(4)

     # Insert 5 at the beginning. So stack becomes 4->5->None
     stack.push(5)

     # Insert 6 at the beginning. So stack becomes 4->5->6->None
     stack.push(6)

     # Insert 7 at the beginning. So stack becomes 4->5->6->7->None
     stack.push(7)

     # Print the stack
     stack.print_stack()

     # Print the top element
     print('\nTop element is ', stack.top())

     # Print the stack size
     print('Size of the stack is ', len(stack))

     # pop the top element
     stack.pop()

     # pop the top element
     stack.pop()

     # two elements have now been popped off
     stack.print_stack()

     # Print True if the stack is empty else False
     print('\nstack is empty:', stack.is_empty())





'''simple docstring'''
import heapq







def 							A_  (    __SCREAMING_SNAKE_CASE    :	List[str]      ,  __SCREAMING_SNAKE_CASE    :	List[Any]      ,  __SCREAMING_SNAKE_CASE    :	str			)					->							Any:





  """simple docstring"""

  __A		:  Dict       				=		[(0, start)]  # cost from start node,end node
  __A		:  Union[str, Any]       				=		set()
  while heap:
    ((__A)				,       (__A))		:  int       				=		heapq.heappop(__SCREAMING_SNAKE_CASE			)
    if u in visited:
      continue
    visited.add(__SCREAMING_SNAKE_CASE			)
    if u == end:
      return cost
    for v, c in graph[u]:
      if v in visited:
        continue
      __A		:  List[str]       				=		cost + c
      heapq.heappush(__SCREAMING_SNAKE_CASE      ,  (next_item, v)			)
  return -1


A__ :		Any					={
    'A': [['B', 2], ['C', 5]],
    'B': [['A', 2], ['D', 3], ['E', 1], ['F', 1]],
    'C': [['A', 5], ['F', 3]],
    'D': [['B', 3]],
    'E': [['B', 4], ['F', 3]],
    'F': [['C', 3], ['E', 3]],
}
A__ :		List[str]					={
    'B': [['C', 1]],
    'C': [['D', 1]],
    'D': [['F', 1]],
    'E': [['B', 1], ['F', 3]],
    'F': [],
}
A__ :		List[Any]					={
    'B': [['C', 1]],
    'C': [['D', 1]],
    'D': [['F', 1]],
    'E': [['B', 1], ['G', 2]],
    'F': [],
    'G': [['F', 1]],
}

A__ :		List[str]					=dijkstra(G, 'E', 'C')
print(short_distance)  # E -- 3 --> F -- 3 --> C == 6

A__ :		Optional[Any]					=dijkstra(Ga, 'E', 'F')
print(short_distance)  # E -- 3 --> F == 3

A__ :		Any					=dijkstra(Ga, 'E', 'F')
print(short_distance)  # E -- 2 --> G -- 1 --> F == 3

if __name__ == "__main__":
     import doctest

     doctest.testmod()



