Carwale Interview Questions, Process, and Tips

2 hours coding round, only 1 person out of 90 cleared

Q1. Asked loads of dsa, super technical questions
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4 dsa questions were asked in online coding round.

DSA question asked in the coding test.

There were 4 questions, CoderByte was the platform used.

1st: Hard: Array: Search GFG for "Maximum size rectangle binary sub-array with all 1s"

2nd: Medium: Search: Longest Palindrome Substring

3rd: Easy: String: Search LEET for "Largest Substring between two equal characters." There was one more condition - the substring should have unique characters.

4th: Easy: String: Given a string, of characters, If "M" is encountered, remove "M" and duplicate the last small case letter. If "N" is encountered, remove "N" and discard the next character.

Q1. This round was supposed to be based on DSA. What is Time Complexity? Give examples.
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Q2. What will be the time complexity to add an element to the Singly Linked List? Note* there are 2 types to add an element: 1st: to add at the end using Tail pointer so O(1) 2nd: to add anywhere in the middle...read more
Ans. 
Time complexity to add an element to a Singly Linked List is O(1) if added at the end using Tail pointer, and O(n) if added anywhere in the middle.
• Adding an element at the end of a Singly Linked List using the Tail pointer is a constant time operation, hence O(1).

• Adding an element anywhere in the middle of a Singly Linked List requires traversing the list to find the insertion point, resulting in a time complexity of O...read more
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Q3. Given an array of numbers, find the smallest Prime Number. I had to write down the whole code.
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Q1. This round was supposed to be System Designs. Asked me about my Web Projects. I Implemented roles. So, how did manage my DB side? How did I give access to certain roles? How to optimize my DB? If I were ...read more
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Q2. Database Designs. They asked me to draw some schema from my project, related to the above questions. Optimize it. They asked me what are Indexes. Query to be returned in O(n). So how will you do this?
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Q3. React What's the difference between using NextJs and ReactJs? Routing in NextJs. VDOM? Event Listeners. Some Hooks in NextJs.
Ans. 
NextJs is a framework built on top of ReactJs, providing server-side rendering and other features for easier development.
• NextJs is a framework built on top of ReactJs, providing server-side rendering, routing, and other features for easier development.

• ReactJs is a JavaScript library for building user interfaces, while NextJs is a framework that adds functionality like server-side rendering and routing to React applicat...read more
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Q4. JSON How to optimize JSON? Wrote a Py code to convert optimized JSON into normal JSON. An alternative method of storing JSON data in another DS
Ans. 
Optimizing JSON involves minimizing redundant data, using efficient data structures, and compressing data when necessary.
• Minimize redundant data by using references or IDs instead of repeating the same information multiple times.

• Use efficient data structures like arrays or dictionaries to store JSON data in a more organized and accessible way.

• Compress JSON data using techniques like gzip or deflate to reduce file size ...read more
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Q1. Tell me about yourself.
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Q2. Technical Qualities. Professional Qualities.
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Q3. Some negative points about it
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Q4. Personal and Family Background.
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Q5. Academic history. Achievements and Lows during Primary and Secondary school.
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Q6. Plan for Higher studies. I said Yes. It is generally said to tell NO even if you have plans. But considering my prior responses they selected me.
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Q7. Commuting to work by train?
Ans. 
Yes, I prefer commuting to work by train for its reliability and eco-friendliness.
• I find commuting by train to be more reliable than other modes of transportation, as it is not affected by traffic congestion.

• Taking the train is also more eco-friendly compared to driving a car, as it reduces carbon emissions.

• Commuting by train allows me to relax, read, or work during the journey, making it a productive use of time.
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4 coding questions. 1 easy, 2 medium, 1 hard.Try to solve 3 out of them.

Q1. DSA based interview round.
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Q2. Simple array and stack related questions were asked.
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Q1. Detailed questions based on your projects,
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Q2. Questions related to MERN as I have done a MERN project in past.
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4 questions :- 3 were string based and one DP
1. characters and it's frequency were given in key value format in a string, print the total frequency of each character in lexicographical order.
2. Minimum Jump to reach end of the array(search Jump game from leetcode)
3. Partion the given string into 2 parts such that both parts are present in list of words provided. Print all the ways of partitioning.

Q1. 1.Find next greater element for each element in the given array of integers
Ans. 
Use stack to find next greater element for each element in the array
• Create an empty stack to store indices of elements

• Iterate through the array and for each element, pop elements from stack until finding a greater element

• Store the next greater element in a result array
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Q2. 2.In an array, find triplets such that their sum is 0.
Ans. 
Use three pointers to find triplets with sum 0 in an array.
• Sort the array first to easily find triplets.

• Use three pointers - one fixed, one moving from left, one moving from right.

• Check if the sum of the three pointers is 0, if not adjust pointers accordingly.
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Q1. Questions regarding projects and system design questions.
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Q1. Family background, questions about project, work preferences etc
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Q1. Introduce yourself, tell me about your past experiences (if any), how many family members are there in your family?
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Q2. What is your preferred location?
Ans. 
I prefer working in a bustling city with easy access to transportation and amenities.
• Prefer urban locations

• Access to public transportation

• Close to amenities like restaurants and shops
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Q3. Do you own a bike? If you don't own one can you manage to own one?
Ans. 
Yes, I own a bike and I am an avid cyclist.
• Yes, I own a bike and use it for commuting and recreational purposes.

• I am familiar with bike maintenance and safety practices.

• I have participated in cycling events and races.
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Q4. What are your strengths and weaknesses?
Ans. 
My strengths include strong communication skills and ability to build relationships. My weaknesses include being overly detail-oriented at times.
• Strengths: strong communication skills

• Strengths: ability to build relationships

• Weaknesses: overly detail-oriented (provide an example of when this has been a weakness)
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