title: How to get all child nodes of a specific node in non-binary tree in C++
body: <p>I'm being stuck because I don't know how to get all child nodes of a specific node in non-binary tree.</p>
  
  <p>For example, the root node is A. </p>
  
  <p>A = {B, C}</p>
  
  <p>B = {D, E, F}</p>
  
  <p>E = {G}</p>
  
  <p>I want to get all child nodes of B = {D, E, F, G}</p>
  
  <p>How can I do? Thank you very much.</p>