Wayfair Data Analyst Intern Interview Questions and Answers

Q1. Program for a palindrome Number.
Ans. 
Program to check if a number is a palindrome.
• Convert the number to a string to easily check for palindrome

• Reverse the string and compare it with the original string

• If they are the same, the number is a palindrome
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Q2. React Lifecycle methods
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Q3. Hooks in react?
Ans. 
Hooks are a feature in React that allow you to use state and other React features in functional components.
• Hooks were introduced in React 16.8.

• They allow you to use state and other React features without writing a class.

• Commonly used hooks include useState, useEffect, useContext, and useReducer.

• Hooks must be used at the top level of your functional component.

• Example: const [count, setCount] = useState(0);
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Q1. Create a High-level design
Ans. 
Design a high-level architecture for a software system
• Identify the main components of the system

• Define the interactions between the components

• Consider scalability, security, and performance

• Choose appropriate technologies and frameworks

• Create a diagram to visualize the architecture
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Q2. Questions on the design you created
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Q1. Delete nth node from end in linked list
Ans. 
To delete the nth node from the end in a linked list, we can use a two-pointer approach.
• Use two pointers, one to traverse the list and another to keep track of the nth node from the end.

• Move the second pointer n steps ahead of the first pointer.

• When the second pointer reaches the end of the list, the first pointer will be at the nth node from the end.

• Adjust the pointers to delete the nth node.
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Q2. Project discussion
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Q1. What is your family background?
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Q2. What are your salary expectations?
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Q3. Tell me about yourself.
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4 questions , 3 DSA questions medium level and 1 DB design round

Q1. Questions on OOPs, Networking, OS app development, projects and DSA questions
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Q1. DB related questions (joins,query) and Linked list medium DSA question.
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The coding test was divided in 4 sections:
1> Java and SpringBoot multiple choice questions
The question topics included, multihreading, springboot context, security

2> Leetcode style program question 1 - Easy

3> Leetcode style program question 2 - Medium
Length of longest consecutive ones by at most one swap.

4> Sql query question

Round duration - 90 minutes
Round difficulty - Medium

This round had 3 coding questions of Medium to Hard level of difficulty.

Q1. 
Intersection of Two Unsorted Arrays Problem Statement
Given two integer arrays ARR1 and ARR2 of sizes 'N' and 'M' respectively, find the intersection of these arrays. The intersection is defined as the se...read more
Ans. 
Find the intersection of two unsorted arrays while maintaining the order of elements from the first array.
• Iterate through the elements of the first array and check if they exist in the second array.

• Use a hash set to keep track of elements already seen in the second array for efficient lookup.

• Maintain the order of elements from the first array while finding the intersection.

• Handle duplicate elements in both arrays appro...read more
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Q2. 
Ways To Make Coin Change
Given an infinite supply of coins of varying denominations, determine the total number of ways to make change for a specified value using these coins. If it's not possible to make...read more
Ans. 
The task is to determine the total number of ways to make change for a specified value using given denominations.
• Create a function that takes in the number of denominations, the denominations array, and the value to make change for as input

• Use dynamic programming to iterate through all possible combinations of coins to make the specified value

• Keep track of the number of ways to make change for each value from 0 to the ...read more
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Q3. 
Longest Substring Without Repeating Characters Problem Statement
Given a string S of length L, determine the length of the longest substring that contains no repeating characters.
Example:
Input:
"abac...read more
Ans. 
Find the length of the longest substring without repeating characters in a given string.
• Use a sliding window approach to keep track of the longest substring without repeating characters.

• Use a hashmap to store the index of each character in the string.

• Update the start index of the window when a repeating character is encountered.

• Calculate the maximum length of the substring as you iterate through the string.
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Round duration - 60 minutes
Round difficulty - Medium

This round started with 2 coding questions and then moved on to some more questions from OOPS.

Q1. 
Palindrome Linked List Problem Statement
You are provided with a singly linked list of integers. Your task is to determine whether the given singly linked list is a palindrome. Return true if it is a pali...read more
Ans. 
Check if a given singly linked list is a palindrome or not.
• Traverse the linked list to find the middle element using slow and fast pointers.

• Reverse the second half of the linked list.

• Compare the first half with the reversed second half to determine if it's a palindrome.
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Q2. 
Search Element in a Rotated Sorted Array
Given a sorted array that has been rotated, the task is to find the index of a specific element. The array is initially sorted in ascending order and then rotated ...read more
Ans. 
Search for an element in a rotated sorted array efficiently in O(logN) time complexity.
• Implement binary search to find the pivot point where rotation occurs.

• Divide the array into two subarrays and perform binary search on the appropriate subarray.

• Handle cases where the element may be in the left or right subarray after rotation.

• Return the index of the element if found, else return -1.
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Q3. What is a static variable in C?
Ans. 
A static variable in C is a variable that retains its value between function calls.
• Declared using the 'static' keyword

• Retains its value throughout the program's execution

• Useful for maintaining state across function calls
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Q4. What is the difference between abstraction and inheritance?
Ans. 
Abstraction is hiding the implementation details while inheritance is a mechanism for creating new classes using existing classes.
• Abstraction focuses on hiding the internal implementation details of a class, allowing the user to only interact with the necessary information.

• Inheritance allows a class to inherit properties and behavior from another class, promoting code reusability and creating a hierarchy of classes.

• Abs...read more
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Round duration - 60 minutes
Round difficulty - Medium

This round had questions mainly from HTML,CSS and JavaScript as I had mentioned some Frontend Projects in my resume so the interviewer wanted to check my skills on those. He also asked me some SQL queries and a simple coding question towards the end of the interview.

Q1. What is event bubbling in JavaScript?
Ans. 
Event bubbling is the process where an event triggered on a child element is propagated up through its parent elements.
• In event bubbling, when an event occurs on a child element, it first runs the event handlers on the child element, then on its parent, then all the way up to the top level of the DOM.

• Event bubbling allows for delegation of event handling to a parent element, reducing the number of event listeners neede...read more
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Q2. How can you optimize the loading of website assets?
Ans. 
Optimizing website asset loading involves minimizing file sizes, reducing HTTP requests, utilizing caching, and prioritizing critical resources.
• Minimize file sizes by compressing images, scripts, and stylesheets.

• Reduce HTTP requests by combining files, using sprites, and lazy loading non-essential resources.

• Utilize browser caching to store static assets locally for faster subsequent page loads.

• Prioritize critical resou...read more
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Q3. In how many ways can you display HTML elements?
Ans. 
There are multiple ways to display HTML elements, including inline, block, inline-block, and flex.
• HTML elements can be displayed as inline, which allows them to flow with surrounding content.

• Block elements take up the full width available and start on a new line.

• Inline-block elements are displayed as blocks, but flow like inline elements.

• Flexbox allows for more advanced layout options, such as aligning items and distri
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Q4. 
Check if Two Strings are Anagrams
Anagrams are words or names that can be formed by rearranging the letters of another word. For instance, 'spar' can be rearranged to form 'rasp', making them anagrams.
E...read more
Ans. 
Check if two strings are anagrams by rearranging their letters.
• Create a frequency map of characters for both strings

• Compare the frequency maps to check if they are equal

• Return True if the frequency maps are equal, else False
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Round duration - 30 minutes
Round difficulty - Easy

This is a cultural fitment testing round. HR was very frank and asked standard questions. Then we discussed about my role.

Q1. What is something about you that is not included in your resume?
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Q2. Why should we hire you?
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