by Ciro Santilli (@cirosantilli, 36)
This is a bit harder than iterative pre-order: now we have to check if there is a left or right element or not:
  • (START) push current
  • if there is left:
    • move left
  • else:
    • (ELSE) pop
    • visit
    • if there is right
      • move right
      • GOTO START
    • else:
      • GOTO ELSE
The control flow can be slightly simplified if we allow NULLs: www.geeksforgeeks.org/inorder-tree-traversal-without-recursion/

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  1. In-order depth-first search
  2. Depth-first search
  3. Tree traversal
  4. Tree (data structure)
  5. Type of graph
  6. Graph (discrete mathematics)
  7. Discrete mathematics
  8. Area of mathematics
  9. Mathematics
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