from __future__ import annotations

from typing import Any



class 				a							:







 """simple docstring"""






 def __init__(					self		,				lowerCAmelCase_ = 6							)  ->					None:
        _A        =  None
        _A        =  None
        self.create_linked_list(lowerCAmelCase_							)



 def      UpperCAmelCase							(					self		,				lowerCAmelCase_							)  ->					None:
        _A        =  Node()
        _A        =  current_node
        _A        =  current_node
        _A        =  current_node
        for _ in range(1		,				lowerCAmelCase_							):
               _A        =  Node()
               _A        =  current_node
               _A        =  previous_node
               _A        =  current_node
        _A        =  self.front
        _A        =  previous_node



 def      UpperCAmelCase							(					self							)  ->					bool:
        return (
            self.front == self.rear
            and self.front is not None
            and self.front.data is None
        )



 def      UpperCAmelCase							(					self							)  ->					Any | None:
        self.check_can_perform_operation()
        return self.front.data if self.front else None



 def      UpperCAmelCase							(					self		,				lowerCAmelCase_							)  ->					None:
        if self.rear is None:
               return

        self.check_is_full()
        if not self.is_empty():
               _A        =  self.rear.next
        if self.rear:
               _A        =  data



 def      UpperCAmelCase							(					self							)  ->					Any:
        self.check_can_perform_operation()
        if self.rear is None or self.front is None:
               return None
        if self.front == self.rear:
               _A        =  self.front.data
               _A        =  None
               return data

        _A        =  self.front
        _A        =  old_front.next
        _A        =  old_front.data
        _A        =  None
        return data



 def      UpperCAmelCase							(					self							)  ->					None:
        if self.is_empty():
               raise Exception("""Empty Queue"""							)



 def      UpperCAmelCase							(					self							)  ->					None:
        if self.rear and self.rear.next == self.front:
               raise Exception("""Full Queue"""							)



class 				a							:







 """simple docstring"""






 def __init__(					self							)  ->					None:
        _A        =  None
        _A        =  None
        _A        =  None


if __name__ == "__main__":
    import doctest

    doctest.testmod()





from __future__ import annotations

_SCREAMING_SNAKE_CASE										=						{
    'A': ['B', 'C', 'E'],
    'B': ['A', 'D', 'E'],
    'C': ['A', 'F', 'G'],
    'D': ['B'],
    'E': ['A', 'B', 'D'],
    'F': ['C'],
    'G': ['C'],
}



class 				a							:







 """simple docstring"""






 def __init__(					self		,				lowerCAmelCase_		,				lowerCAmelCase_							)  ->					None:
        _A        =  graph
        # mapping node to its parent in resulting breadth first tree
        _A        =  {}
        _A        =  source_vertex



 def      UpperCAmelCase							(					self							)  ->					None:
        _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(lowerCAmelCase_							)
                             _A        =  vertex
                             queue.append(lowerCAmelCase_							)



 def      UpperCAmelCase							(					self		,				lowerCAmelCase_							)  ->					str:
        if target_vertex == self.source_vertex:
               return self.source_vertex

        _A        =  self.parent.get(lowerCAmelCase_							)
        if target_vertex_parent is None:
               _A        =  (
                   F'''No path from vertex: {self.source_vertex} to vertex: {target_vertex}'''
               )
               raise ValueError(lowerCAmelCase_							)

        return self.shortest_path(lowerCAmelCase_							) + F'''->{target_vertex}'''


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




