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142. Locate the Farthest Left Node on the Bottom Level

Objective: - Given a binary tree, Find the deepest left node in it.


  • This approach is similar to "Find the Deepest Node in a Binary Tree" with little modification.
  • Take two global variables as deepestlevel and deepLeftNode.
  • starting with level=0, Do the inorder traversal and whenever you go down one level ( root.left OR root.right), increase the level by 1.
  • Keep checking if the current node is the left child and deepestlevel < level, if yes then update the deepestlevel and deepLeftNode.
  • At the end return " deepLeftNode ", which will be the deepest node value.
  • See the code for a better explanation.


Deepest Left child is: 4

Approach: - Without using global variables

We will keep track of the deepest left node and pass it along during recursion. Will take the Result object ( with data and level). See the code below for more understanding.



Deepest Left child is: 18