



__snake_case     :Optional[Any]			       ={
    'A': ['B', 'C', 'E'],
    'B': ['A', 'D', 'E'],
    'C': ['A', 'F', 'G'],
    'D': ['B'],
    'E': ['A', 'B', 'D'],
    'F': ['C'],
    'G': ['C'],
}






def  lowerCamelCase_	(      lowerCAmelCase__	:	dict			,	lowerCAmelCase__	:	Optional[int]			,	lowerCAmelCase__	:	Any				)       ->							list[str]:

							'''simple docstring'''






							A      						=    set()
							# keep track of all the paths to be checked
							A      						=    [[start]]

							# return path if start is goal
							if start == goal:
														return [start]

							# keeps looping until all possible paths have been checked
							while queue:
														# pop the first path from the queue
														A      						=    queue.pop(0				)
														# get the last node from the path
														A      						=    path[-1]
														if node not in explored:
																					A      						=    graph[node]
																					# go through all neighbour nodes, construct a new path and
																					# push it into the queue
																					for neighbour in neighbours:
																												A      						=    list(lowerCAmelCase__				)
																												new_path.append(lowerCAmelCase__				)
																												queue.append(lowerCAmelCase__				)
																												# return path if neighbour is goal
																												if neighbour == goal:
																																			return new_path

            # mark node as explored
																					explored.add(lowerCAmelCase__				)

    # in case there's no path between the 2 nodes
							return []






def  lowerCamelCase_	(      lowerCAmelCase__	:	dict			,	lowerCAmelCase__	:	Dict			,	lowerCAmelCase__	:	Tuple				)       ->							int:

							'''simple docstring'''






							if not graph or start not in graph or target not in graph:
														return -1
							if start == target:
														return 0
							A      						=    [start]
							A      						=    set(lowerCAmelCase__				)
							# Keep tab on distances from `start` node.
							A      						=    {start: 0, target: -1}
							while queue:
														A      						=    queue.pop(0				)
														if node == target:
																					A      						=    (
																					    dist[node] if dist[target] == -1 else min(dist[target]			,	dist[node]				)
																					)
														for adjacent in graph[node]:
																					if adjacent not in visited:
																												visited.add(lowerCAmelCase__				)
																												queue.append(lowerCAmelCase__				)
																												A      						=    dist[node] + 1
							return dist[target]


if __name__ == "__main__":
				print(bfs_shortest_path(demo_graph, 'G', 'D'))  # returns ['G', 'C', 'A', 'B', 'D']
				print(bfs_shortest_path_distance(demo_graph, 'G', 'D'))  # returns 4







from collections.abc import Iterable
from typing import Generic, TypeVar

UpperCamelCase    							=      TypeVar('_T')







class 		_A						( Generic[_T] ):

  def __init__(    self						:	int   ,				lowerCamelCase__						:	Iterable[_T] | None = None			):
     """simple docstring"""

     __UpperCamelCase	:			list[_T]					=					list(iterable or []			)
     __UpperCamelCase	:			list[_T]					=					[]

  def __len__(    self						:	str			):
     """simple docstring"""

     return len(self._stacka			) + len(self._stacka			)

  def __repr__(    self						:	Dict			):
     """simple docstring"""

     return f'Queue({tuple(self._stacka[::-1] + self._stacka			)})'

  def    a					(    self						:	Union[str, Any]   ,				lowerCamelCase__						:	_T			):
     """simple docstring"""

     self._stacka.append(lowerCamelCase__			)

  def    a					(    self						:	Union[str, Any]			):
     """simple docstring"""

     __UpperCamelCase	:			Any					=					self._stacka.pop
     __UpperCamelCase	:			int					=					self._stacka.append

     if not self._stacka:
        while self._stacka:
           stacka_append(stacka_pop()			)

     if not self._stacka:
        raise IndexError("""Queue is empty"""			)
     return self._stacka.pop()


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

       testmod()



