Calculate size of a tree
Calculating the size of a tree means determining the total number of nodes in the tree. In simple terms, a tree is a data structure made up of nodes, where each node has a value and can have zero or more child nodes. The size of a tree refers to the total number of nodes present in the entire tree, including the root node, all its children, and their children, and so on. Counting the nodes of a tree is a common operation in computer science, and it can be useful in various applications such as analyzing algorithms, evaluating the complexity of a problem, or optimizing memory usage.
Number of node in tree is called size of tree. Here given best solution of this problem which is solve by recursion.

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