title: Post-order Graph Traversal?
body: <p>Given the directed graph below, how did we achieve the <strong>post-order</strong> traversal?</p>
  
  <p>DFS</p>
  
  <p>Visiting order in Pre-order traversal:  1 2 5 4 6 3</p>
  
  <p>Visiting order in Post-order traversal: 4 6 5 2 1 3</p>
  
  <p><a href="https://i.stack.imgur.com/ZhEIt.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/ZhEIt.jpg" alt="enter image description here"></a></p>