




from __future__ import annotations

_lowerCamelCase     :		Optional[int]								=       {
    "A": ["B", "C", "E"],
    "B": ["A", "D", "E"],
    "C": ["A", "F", "G"],
    "D": ["B"],
    "E": ["A", "B", "D"],
    "F": ["C"],
    "G": ["C"],
}


class     UpperCamelCase_   :

    '''simple docstring'''






    def __init__(      self				:     List[str] ,			UpperCAmelCase__				:     Any ,			UpperCAmelCase__				:     List[str])						->Union[str, Any]:





           '''simple docstring'''

           A__							=   graph
           # mapping node to its parent in resulting breadth first tree
           A__							=   {}
           A__							=   source_vertex


    def 	SCREAMING_SNAKE_CASE							(      self				:     int)						->List[Any]:





           '''simple docstring'''

           A__							=   {self.source_vertex}
           A__							=   None
           A__							=   [self.source_vertex]  # first in first out queue

           while queue:
                  A__							=   queue.pop(0)
                  for adjacent_vertex in self.graph[vertex]:
                         if adjacent_vertex not in visited:
                                visited.add(_a)
                                A__							=   vertex
                                queue.append(_a)





    def 	SCREAMING_SNAKE_CASE							(      self				:     int ,			UpperCAmelCase__				:     Dict)						->List[Any]:





           '''simple docstring'''

           if target_vertex == self.source_vertex:
                  return self.source_vertex

           A__							=   self.parent.get(_a)
           if target_vertex_parent is None:
                  A__							=   (
                      f"""No path from vertex: {self.source_vertex} to vertex: {target_vertex}"""
                  )
                  raise ValueError(_a)

           return self.shortest_path(_a) + f"""->{target_vertex}"""


if __name__ == "__main__":
  _lowerCamelCase     :		int								=       Graph(graph, """G""")
  g.breath_first_search()
  print(g.shortest_path("""D"""))
  print(g.shortest_path("""G"""))
  print(g.shortest_path("""Foo"""))








class     UpperCamelCase_   :

    '''simple docstring'''






    def __init__(      self				:     List[str] ,			UpperCAmelCase__				:     int)						->Union[str, Any]:





           '''simple docstring'''

           A__							=   n
           A__							=   [None] * self.n
           A__							=   0  # index of the first element
           A__							=   0
           A__							=   0


    def __len__(      self				:     List[Any])						->int:





           '''simple docstring'''

           return self.size


    def 	SCREAMING_SNAKE_CASE							(      self				:     List[Any])						->bool:





           '''simple docstring'''

           return self.size == 0


    def 	SCREAMING_SNAKE_CASE							(      self				:     str)						->List[Any]:





           '''simple docstring'''

           return False if self.is_empty() else self.array[self.front]


    def 	SCREAMING_SNAKE_CASE							(      self				:     List[str] ,			UpperCAmelCase__				:     str)						->Any:





           '''simple docstring'''

           if self.size >= self.n:
                  raise Exception('''QUEUE IS FULL''')

           A__							=   data
           A__							=   (self.rear + 1) % self.n
           self.size += 1
           return self





    def 	SCREAMING_SNAKE_CASE							(      self				:     Union[str, Any])						->Any:





           '''simple docstring'''

           if self.size == 0:
                  raise Exception('''UNDERFLOW''')

           A__							=   self.array[self.front]
           A__							=   None
           A__							=   (self.front + 1) % self.n
           self.size -= 1
           return temp


