Question: Implement a function that given a binary search tree, returns the sum of values in tree nodes along the search path. ( k is the

Implement a function that given a binary search tree, returns the sum of values in tree nodes along the search path. (k is the key to search for, r is the root of the binary search tree). You can assume that k always exists in the binary search tree r. Assume the tree_node is defined as follows:
Implement a function that given a binary search

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