Wayfair Software Developer Interview Questions and Answers

Permutations and combinations, time and work

Baesd on leetcode question varies from easy to difficult

Coding test based on Binary trees, String Manipulation

Q1. We have considered to directly send your profile to companies. How much CTC do you expect?
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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. 
Approach 1 (Using Hashing) :

1) Initialize an empty set hs.
2) Iterate through the first array and put every element of the first array in the set S.
3) For every element x of the second array, do the following :
Search x in the set hs. If x is present, then print it.


TC : O(N+M) under the assumption that hash table search and insert operations take O(1) time, here N=size of array
1 and M=size of array 2.
SC : O(min(N,M))



Appr...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. 
This was a very standard DP problem and I had already solved it on platforms like LeetCode and CodeStudio so I
was able to come up with the logic and code it preety fast.


Steps :

1) Create a two-dimensional array, ‘dp’, where ‘dp[i][j]’ will denote the total number of ways to make j value by using i
coins.

2) Run 2 loops ,1st one from 1 to value and second one throught the array denominations.

3) Fill dp array by the recurre...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. 
Approach : I solved it using 2-pointers and keeping a track of the frequency of the elements encountered in a freq
array of size 26.

Steps :

1) Initiliase a freq array of size 26 where a=0, b=1 ...,z=25 .
2) Let s be our string and n = s.size()
3) Do , freq[s[0]]++;
4) Keep 2 pointers start and end where initially start=0 and end=1 also maintain a answer variable ans where initially
ans=0
5) Now run a loop till end=1 and start...read more
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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. 
Approach :

1) Recursively traverse the entire linked list to get the last node as a rightmost node.

2) When we return from the last recursion stack. We will be at the last node of the Linked List. Then the last node
value is compared with the first node value of Linked List.

3) In order to access the first node of Linked List, we create a global left pointer that points to the head of Linked List
initially that will be avai...read more
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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. 
This was a preety standard Binary Search Question and I had solved this question before on platforms like LeetCode
and CodeStudio . I was asked this question to test my implementation skills and how well do I handle Edge Cases .

Approach :

1) The idea is to find the pivot point, divide the array in two sub-arrays and perform binary search.

2) The main idea for finding pivot is – for a sorted (in increasing order) and pivot...read more
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Q3. What is a static variable in C?
Ans. 
1) Static variables are initialized only once.
2) The compiler persists with the variable till the end of the program.
3) Static variables can be defined inside or outside the function.
4) They are local to the block.
5) The default value of static variables is zero.
6) The static variables are alive till the execution of the program.

Here is the syntax of static variables in C language,

static datatype variable_name = value;

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Q4. What is the difference between abstraction and inheritance?
Ans. 
The main difference between abstraction and inheritance is that abstraction allows hiding the internal details and displaying only the functionality to the users, while inheritance allows using properties and methods of an already existing class.
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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 a method of event propagation in the HTML DOM API when an event is in an element inside another element, and both elements have registered a handle to that event. It is a process that starts with the element that triggered the event and then bubbles up to the containing elements in the hierarchy. In event bubbling, the event is first captured and handled by the innermost element and then propagated to...read more
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Q2. How can you optimize the loading of website assets?
Ans. 
To optimize website load time we need to optimize its asset loading and for that:

1) CDN hosting - A CDN or content delivery network is geographically distributed servers to help reduce latency.

2) File compression - This is a method that helps to reduce the size of an asset to reduce the data transfer

3) File concatenation - This reduces the number of HTTP calls

4) Minify scripts - This reduces the overall file size of js...read more
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Q3. In how many ways can you display HTML elements?
Ans. 
1) inline: Using this we can display any block-level element as an inline element. The height and width attribute values of the element will not affect.

2) block: using this, we can display any inline element as a block-level element. 

3) inline-block: This property is similar to inline, except by using the display as inline-block, we can actually format the element using height and width values.

4) flex: It displays...read more
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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. 
Approach 1(Using Sorting) : 
1) Sort both strings
2) Compare the sorted strings

TC : O(N*log(N)), where N = length of the string
SC : O(1)


Approach 2(Counting characters) : 

1) Create count arrays of size 256 for both strings. Initialize all values in count arrays as 0.
2) Iterate through every character of both strings and increment the count of character in the corresponding count arrays.
3) Compare count arrays. I...read more
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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?
Ans. 
If you get this question, it's an opportunity to choose the most compelling information to share that is not obvious from your resume.

Example :

Strength -> I believe that my greatest strength is the ability to solve problems quickly and efficiently, which makes me unique from others.

Ability to handle Pressure -> I enjoy working under pressure because I believe it helps me grow and become more efficient.

Tip : Empha...read more
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Q2. Why should we hire you?
Ans. 
Tip 1 : The cross questioning can go intense some time, think before you speak.

Tip 2 : Be open minded and answer whatever you are thinking, in these rounds I feel it is important to have opinion.

Tip 3 : Context of questions can be switched, pay attention to the details. It is okay to ask questions in these round, like what are the projects currently the company is investing, which team you are mentoring. How all is the...read more
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