Zoom Technologies Software Engineer Interview Questions and Answers

Round duration - 40 minutes
Round difficulty - Easy

Technical round with questions based on DSA.

Q1. 
Reverse a Number Problem Statement
Create a program to reverse a given integer N. The output should be the reversed integer.
Note:
If a number has trailing zeros, their reversed version should not inclu...read more
Ans. 
Reverse a given integer while excluding trailing zeros.
• Create a program to reverse the given integer by converting it to a string and then reversing it.

• Remove any trailing zeros from the reversed string before converting it back to an integer.

• Handle the constraints of the input integer being between 0 and 10^8.

• Example: For input 1230, the output should be 321.
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Q2. 
Reverse a Linked List Problem Statement
You are given a Singly Linked List of integers. Your task is to reverse the Linked List by changing the links between nodes.
Input:
The first line of input contai...read more
Ans. 
Reverse a given singly linked list by changing the links between nodes.
• Iterate through the linked list and reverse the links between nodes.

• Use three pointers to keep track of the current, previous, and next nodes.

• Update the links while traversing the list to reverse it.

• Return the head of the reversed linked list.
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Q3. What is the difference in C++ between 'new int[5]' and 'malloc(5 * sizeof(int))'?
Ans. 
new int[5] is C++ specific and initializes the array with default values, while malloc(5 * sizeof(int)) is a C function and does not initialize the array.
• new int[5] is C++ specific and calls constructors for each element in the array.

• malloc(5 * sizeof(int)) is a C function and does not call constructors, leaving the array uninitialized.

• new int[5] returns a pointer to the first element of the array, while malloc(5 * siz...read more
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Q1. Questions around software design
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Question from Strings and Question from Linked Lists

Q1. What are double pointers ?
Ans. 
Double pointers are pointers that store the memory address of another pointer.
• Double pointers are used in C and C++ to store the address of a pointer variable.

• They are commonly used in functions to modify the value of a pointer passed as an argument.

• Example: int **ptr; // declares a double pointer to an integer pointer.
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Q2. Discuss OOPS in Programming.
Ans. 
OOPS stands for Object-Oriented Programming, a programming paradigm based on the concept of objects.
• OOPS focuses on creating objects that contain both data and methods to manipulate that data.

• Encapsulation, inheritance, and polymorphism are key principles of OOPS.

• Example: Inheritance allows a class to inherit properties and methods from another class, promoting code reusability.
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Q1. Some program snippets were given in C language and told to debug it
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Q2. Running median in stream
Ans. 
Calculate the running median of a stream of numbers.
• Use two heaps - a max heap for the smaller half of the numbers and a min heap for the larger half.

• Keep the heaps balanced by ensuring the size difference is at most 1.

• If the heaps are balanced, the median is the average of the top elements of the two heaps. Otherwise, it is the top element of the larger heap.
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Q1. Why we use trie and its advantages and dis-advantages
Ans. 
Trie is a tree data structure used for efficient retrieval of key-value pairs, commonly used in autocomplete and spell check applications.
• Advantages: efficient prefix search, space optimization for storing keys with common prefixes, easy to implement autocomplete and spell check functionalities

• Disadvantages: can be memory intensive for large datasets, complex to implement compared to other data structures like hash tab...read more
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Q2. Networking related questions
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Q1. You Have a Data Stream and integers are coming at each second you have to identify the erroneous values.
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Q1. Tell me about your previous company role ?
Ans. 
I was a software engineer responsible for developing and maintaining web applications for a financial services company.
• Developed and maintained web applications using technologies such as Java, Spring, and Angular

• Collaborated with cross-functional teams to gather requirements and deliver solutions

• Participated in code reviews and testing to ensure high quality software

• Implemented new features and enhancements to improve
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Q2. Willing to join Arista ?
Ans. 
Yes, I am willing to join Arista as a Software Engineer.
• I am excited about the opportunity to work at Arista and contribute to their innovative projects.

• I have researched the company and believe that my skills align well with their values and goals.

• I am confident that I can make a positive impact on the team and help drive success at Arista.
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One Hr interview with 3-4 coding questions on strings,array and linked list

Q1. Javascript / UI related
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SYSTEM Design

3 coding questions; 1 was of Trie, 1 was greedy and another was related to OOPs, and high level data structures

Q1. Based on resume, technical skills.
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Q1. Again Technical skills and CS subjects knowledge
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