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Print Left View of a given binary tree

Objective: In a Binary Tree, print the left view of it

Input: A binary tree.

What is left View of a binary Tree?

When just looking at the tree from the left side, all the nodes you can see will be the left view of the tree.


Left View of a binary tree


Method 1:

  • Traverse the tree from left to right
  • Print the first node you encounter
  • Take two variables , currentLevel=0 and nextLevel=1
  • As soon as you change level, change the currentLevel = nextLevel
  • Print only when current level<nextLevel so this way you will print only the first element
  • For the rest of the nodes on the level currentLevel and nextLevel are equal so it won't print

Method 2:

Do the Level order traversal and print the first node value


5 10 20 45
METHOD 2 : Using Level Order, Left view
5 10 20 45

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