[interviewDojo] #4: Check if a tree is a Binary Search Tree

Hi,

Today's problem is a fundamental algorithm to practice traversing tree data structures.

Problem

Given a binary tree, write an efficient algorithm to validate that the tree is a Binary Search Tree (BST). A tree is a BST if for every node in the tree the left child is smaller than the current node and the right child is bigger than the current node.

Solution
Try to solve the problem by yourself and then go over our discussion and solution to learn more.


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Older messages

[interviewDojo] #3: Binary Trees Boot Camp

Friday, April 10, 2020

Hi, Binary Trees are extremely common in interview questions. Today we review the basics and implement the two most important traversal algorithms: DFS (Depth First Search) and BFS (Breadth First

[interviewDojo] #1: Sorting Boot camp

Thursday, April 9, 2020

Hi! Today we discuss why sorting is important for algorithmic problem solving and we review the most important sorting algorithms. In the following days we will learn how to apply these techniques to

[interviewDojo] #2: Merge K sorted array, size N each

Thursday, April 9, 2020

Hi, Today we solve a classic sorting problem that is full of great patterns and ideas (super useful to solve interview problems). Problem Given K sorted arrays, write an algorithm that merges these

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