title: Dijsktra algorithm - precedessors
body: <p>I am trying to find out what are the predecessors to each vertex in this graph:
  <a href="https://i.stack.imgur.com/ujqD8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ujqD8.png" alt="enter image description here"></a></p>
  
  <p>Is the predecessor to the vertex B vertex A or vertex E? The starting vertex is A. </p>