Question

A student believes that Binary Search Trees possess the following property.

 (a) A student believes that Binary Search Trees possess the following property. Suppose we search for a key and the matching node is a leaf node. Let L be the set of all nodes to the left of the search path, P the set of all nodes on the search path, and R be the set of all nodes to the right of the search path. The student claims that any three keys I ∈ L, p ∈ P, and r ∈ R must satisfy I ≤ p ≤ r. Give a simple counter-example to prove that it is not the case. 

 (b) Is the remove/delete operation for Binary Search Trees commutative? That is, does deleting nodes X then Y result in the same tree as deleting nodes Y then X? Argue why it is true or else give a counter-example.  


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