ZoomInfo Interview Questions

Note: ensure you read the disclaimer on the previous page reading the accuracy and sourcing of these problems.

Validate Palindrome

Given a string str , can you write a method that will return True if is a palindrome and False if it is not? If you'll recall, a palindrome is defined as "a word, phrase, or sequence that reads the same backward as forward". For now, assume that we will not have input strings that contain spec...

Difficulty: 3/10

Detect Loop in Linked List

What is the best way to find out if a linked list contains a loop? You're given the following data structure as the definition of a linked list node: js class LinkedListNode constructor val this.val val this.next null A loop or a cycle in graph less...

Difficulty: 7/10

Text Justification

Can you justify input text represented by an array of words so it looks pretty when printed and the whitespaces are balanced? For example, in the above image, we have an input array of "wow", "so", "cool", "is", "algodaily!" . This is a list of words we need to properly arrange, with the ideal ...

Difficulty: 9/10

Levenshtein Edit Distance

An edit distance is a way to quantify how different two strings are. This is calculated using **the minimum number of transformations to turn one string to another**. The transformations include insertion , deletion , and substitution . So when comparing two identical strings, say cat and ca...

Difficulty: 7/10

Balanced Brackets

As a software engineer, you'll often be asked to optimize programs. One of the easiest ways to do so is by the introduction of an additional data structure. Here's another classic problem along the same vein. We're provided a string like the following: " " that is inclusive of the following ...

Difficulty: 5/10

Implement a Stack With Minimum

Recall that a stack is an abstract data type modeling a collection of elements. Its primary operations are push which adds an element to the top of the stack and pop which removes the most newest element . Traditionally, a stack can easily be implemented in many dynamic languages using an a...

Difficulty: 6/10

Counting Univalued Subtrees

Question Can you count all the univalued subtrees in a binary tree, as shown in the figure below? The Problem We are given a binary tree. The challenge is to count all the univalued subtrees in the tree. Just to recall, a subtree is any node along with its descendants. The root...

Difficulty: 6/10

Implement a Graph

Since a graph lessons simple reference to graphs is one of the more difficult data structures to conceptualize in a programmatic 2D manner, let's go ahead and implement it! We'll go with an adjacency list version. Note that there's also the adjacency matrix method which we will cover later....

Difficulty: 4/10

Sum Digits Until One

We're provided a positive integer num . Can you write a method to repeatedly add all of its digits until the result has only one digit? Here's an example: if the input was 49 , we'd go through the following steps: start with 49 4 9 13 since the previous addition was 13, move ont...

Difficulty: 4/10

Solving Problems with Fenwick Tree

**Introduction to Fenwick Trees** Fenwick Trees, also known as Binary Indexed Trees BIT , are a specialized data structure used to efficiently update and query prefix sums of an array. Imagine you have an array of elements and you need to perform two types of operations: 1. Update: Change the v...

Difficulty: 5/10

Functions in C++

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Difficulty: 5/10

Edit Distance

Introduction to Edit Distance Edit distance is a concept in string manipulation that measures the similarity between two strings. It calculates the minimum number of operations required to transform one string into another. These operations include: **Insertion**: Adding a character to a str...

Difficulty: 5/10

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People at ZoomInfo Say

This information was sourced from reviews originally posted on Glassdoor.

The benefits are very solid, there's room for upward mobility, and opportunities for professional development.

We have been at the forefront of our industry which has allowed me to gain exponential growth and experience over the years. Engineering is constantly pushing to learn new technologies and solve tough problems. Office perks has been getting better and better too.

Awesome team members to work with. Flexible PTO.

ZoomInfo is a great company for software development. ZoomInfo offers challenging work using up to date and interesting technologies. It is a great place to develop new skills and gain experience in some of the "hot" industry technologies. There are a lot of great employees here that are more than willing to share their own knowledge, encourage employee growth, and have fun in the process. ZoomInfo is attempting to tackle some very difficult problems that will push you as a software developer. Additionally, the work/life balance is fantastic and management is very easy to work. A number of the managers at Zoom were previously developers at Zoom, so they have a great understanding of the challenges presented in the work here.