Find the Size of the Binary Tree

Objective: Given a Binary tree, Find the size of the tree.

Note : Size of the tree is number of nodes in the tree

Input: A Binary Tree.

Output: Size of the tree.

Example :


Approach :

  • Very Simple solution
  • Start from the root.
  • Size = 1 (for the root) + Size Of left Sub-Tree + Size Of right Sub-Tree
  • solve the left sub-tree and right sub-tree recursively.

Time Complexity : O(n)



Size of the Tree is : 7

4 Responses

  1. XIANG ZUO says:

    1+3+3=8, nice try

  2. lipsa patel says:

    Both of the images represent wrong size 8 instead of 7

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