Diameter of the tree (optimized approach)

#1

sir here why do we return the height if we just need the diameter?
why do not we just return the diameter if we just want to calculate the diameter?!!

#2

This is self understood , i think you want to something else
suppose if tree is like this

       1
     /   \
    2     3
   /    
  4

then diameter of the tree is not this, this is width

       1
     /   \
    2     3
   /    
  4     
|____________|

diameter is this

       1
    //  \\
    2    3
  //    
  4

The diameter of a tree (sometimes called the width) is the number of nodes on the longest path between two end nodes.

#3

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