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Count the number of unival subtrees in a binary tree

7/10/2021

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Below question content has been taken from :
crazycoderzz.wordpress.com/count-the-number-of-unival-subtrees-in-a-binary-tree/

​ Though below question is tagged as Easy one, but it is not that easy also.
 It can be easy for Googlers, but not for me.
Picture
Picture
 Below I have used bottom-up approach, even the same is also suggested on above website.
 Below I am giving Java code as per my current understanding, & below code may be wrong 
 as I tested it for above given examples only.
 It will really helpful if one can provide the correct code, in case of any concern, so that others 
 can also learn. The problem asked around this concept on LeetCode, I can say easy & you   can see its solution here, 965. Univalued Binary Tree
 On above website C++ code is given which one can refer.
Picture
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