Question: Implement a function to check if a binary tree is a binary search tree.

From: Cracking the Coding Interview [McDowell]

Subject: Trees and Graphs

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Select a Subject Algorithm Analysis Arrays and Strings Bit Manipulation C and Cpp Code Quality Combinatorial Search Concurrency Data Structures Databases Design Patterns Dynamic Programming General Graph Theory Hard Java Knowledge Based Linked Lists Math and Logic Puzzles Moderate Object-Oriented Design Recursion Recursion and Dynamic Programming Soft Skills Sorting and Searching Stacks and Queues System Design and Scalability Testing Threads and Locks Trees and Graphs