Count unival subtrees in Binary Tree
Count the number of unival subtrees (subtrees where all nodes under it have the same value) in a Binary Tree
Problem from: Daily Coding Problem (dailycodingproblem.com)
FYI, this problem was asked by Google.
Algorithms used: Recursion
Time Complexity (TC): O(2^(depth of Binary Tree))
Space Complexity (SC): O(number of nodes)
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