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Carwale Interview Questions and Answers
65 Interview questions
When we visit a URL, the browser sends a request to the server hosting the website, which then responds with the requested web page.
Browser sends a request to the server hosting the website
Server processes the request and responds with the requested web page
Web page is displayed in the browser for the user to interact with
I have always been a dedicated student, excelling in academics and extracurricular activities.
Consistently achieved top grades in all subjects
Participated in various school competitions and won awards
Served as a class representative and organized events
Took part in sports teams and cultural activities
Use binary search to find the target element in a rotated sorted array.
Perform binary search to find the pivot element where the array is rotated.
Based on the pivot element, determine which half of the array to search for the target element.
Continue binary search in the appropriate half of the array to find the target element.
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.
Remove duplicates from array of strings in place
Use a HashSet to keep track of unique elements
Iterate through the array and remove duplicates by checking if element is already in the HashSet
Update the array in place by shifting elements to fill in the removed duplicates
Design a NoSQL document schema for storing bike model data efficiently.
Use a document structure to represent each bike model.
Include fields like 'modelName', 'brand', 'year', 'specifications', and 'price'.
Specifications can be an embedded document with attributes like 'weight', 'frameMaterial', and 'gearCount'.
Utilize arrays for features, such as 'colorsAvailable' and 'accessoriesIncluded'.
Example document: { mode...
Design a database for a college
Create tables for students, courses, professors, departments, and grades
Establish relationships between tables using foreign keys
Include attributes such as student ID, course ID, professor ID, department ID, and grade
Consider normalization to reduce redundancy and improve data integrity
Pseudo code to validate password
Create a function that takes a password as input
Check if the password meets the required criteria (e.g. length, special characters)
Return true if the password is valid, false otherwise
Find subarray in an array with sum 0
Iterate through the array and keep track of the running sum
Store the running sum in a hashmap and check if the same sum has been seen before
If the sum is 0 or if the running sum is already in the hashmap, a subarray with sum 0 exists
Database design for a blogging website
Create tables for users, blog posts, comments, and categories
Use primary and foreign keys to establish relationships between tables
Include fields such as title, content, author, date, and tags
Implement indexing for faster retrieval of data
Consider implementing a caching mechanism for improved performance
Carwale Interview Experiences
43 interviews found
SDE (Software Development Engineer) Interview Questions & Answers
Prasun Goyal
posted on 30 Sep 2015
Interview Questionnaire
14 Questions
- Q1. Make 24 using 8, 8, 3, 3 using + = / * ( ) .
- Q2. Find all permutations of a given string. (Not in lexicographic order)
- Ans.
Find all permutations of a given string.
Use recursion to swap each character with every other character in the string.
Repeat the process for each substring.
Add the permutation to an array.
- Q3. Given an array of size 98 and it has natural numbers from 1-100 but 2 numbers are missing. find them
- Ans.
Given an array of size 98 with natural numbers from 1-100 but 2 numbers are missing, find them.
Calculate the sum of all numbers from 1-100 using the formula n(n+1)/2
Calculate the sum of all numbers in the array
Subtract the sum of array from the sum of all numbers to get the sum of missing numbers
Find the missing numbers by iterating through the array and checking which numbers are not present
- Q4. Fnd if a binary tree is bst or not
- Ans.
Check if a binary tree is a binary search tree or not.
Traverse the tree in-order and check if the elements are in sorted order.
Check if the left child is less than the parent and the right child is greater than the parent.
Use recursion to check if all the subtrees are BSTs.
Maintain a range for each node and check if the node value is within that range.
- Q5. Detect and remove cycle in a linked list
- Ans.
Detect and remove cycle in a linked list
Use two pointers, one slow and one fast, to detect a cycle
Once a cycle is detected, move one pointer to the head and iterate both pointers until they meet again
Set the next node of the last node in the cycle to null to remove the cycle
- Q6. A string is given consisting of lowercase alphabets. Write a function which returns yes if the string has all the lowercase letters appearing in it at least once. O(N) time and without using extra space
- Q7. Convert a given number to its hexadecimal form
- Ans.
Convert a number to its hexadecimal form
Use the built-in function to convert the number to hexadecimal
Alternatively, use the algorithm to convert the number to hexadecimal manually
Ensure to handle negative numbers appropriately
- Q8. Asked me how I rate myself in various subjects (CN , DBMS , OOPS ,OS). I told him that I am comfortable with OS and OOPS. Then he asked : Why multiple inheritance is not supported in JAVA. I told him tha...
- Q9. Explain priority scheduling (preemptive , non-preemptive). Explain a case when a low priority process will preempt a high priority process
- Ans.
Priority scheduling is a scheduling algorithm where processes are assigned priorities and executed based on their priority level.
Preemptive priority scheduling allows a higher priority process to interrupt a lower priority process that is currently running.
Non-preemptive priority scheduling allows a higher priority process to wait until the lower priority process finishes executing.
A low priority process can preempt a ...
- Q10. Brief discussion over one of my project
- Q11. Explain singleton class and write code for it.
- Ans.
Singleton class is a class that can only have one instance at a time.
Singleton pattern is used when we need to ensure that only one instance of a class is created and that instance can be accessed globally.
The constructor of a singleton class is always private to prevent direct instantiation.
A static method is used to access the singleton instance.
Example: public class Singleton { private static Singleton instance = ne...
- Q12. Develop tic-tac-toe game and write code using concepts of OOPS in CPP. (Initially told me to include artificial intelligence also but was later satisfied without it
- Ans.
Develop tic-tac-toe game using OOPS concepts in CPP.
Create a class for the game board
Create a class for the players
Create a class for the game logic
Use inheritance and polymorphism for game objects
Implement functions for checking win/lose/draw conditions
- Q13. Normal HR questions
- Q14. Long discussion over my projects
Interview Preparation Tips
Experience: Attempt at least 2 questions
Duration: 90 minutes
Total Questions: 4
Round: Technical Interview
Experience: The interviewer asked to write the full code for a couple of questions only.
Tips: Prepare puzzles.
Think loudly.
Ask for a hint if stuck.
Round: Technical Interview
Tips: Be honest with your interviewer. ;)
Skill Tips: Must be capable to solve puzzles as well as coding questions with good speed and accuracy.
Skills: Puzzle Solving Capability, Implementation of code using OOPS., Algorithm, Data Structures, Operating System Basics, Object Oriented Programming (OOP) Basics
College Name: NIT Bhopal
Motivation: Carwale currently has around 100-125 employees. So it's a good platform to learn new technology. The salary is also good.
Skills evaluated in this interview
Selected
I applied via Campus Placement and was interviewed in Aug 2024. There were 3 interview rounds.
Array , String, stack , queue - Basic Easy to medium level
(2 Questions)
- Q1. What happen when we visit Url
- Ans.
When we visit a URL, the browser sends a request to the server hosting the website, which then responds with the requested web page.
Browser sends a request to the server hosting the website
Server processes the request and responds with the requested web page
Web page is displayed in the browser for the user to interact with
- Q2. Difference B/w Http and https
- Ans.
HTTP is a protocol used for transferring data over the internet, while HTTPS is a secure version of HTTP that encrypts data.
HTTP stands for Hypertext Transfer Protocol, used for transmitting data over the internet.
HTTPS stands for Hypertext Transfer Protocol Secure, which adds a layer of security by encrypting data.
HTTP operates on port 80, while HTTPS operates on port 443.
HTTPS uses SSL/TLS certificates to establish a...
(2 Questions)
- Q1. Journey through school life till now
- Ans.
I have always been a dedicated student, excelling in academics and extracurricular activities.
Consistently achieved top grades in all subjects
Participated in various school competitions and won awards
Served as a class representative and organized events
Took part in sports teams and cultural activities
- Q2. Tell everything and also mention achievement you received
Interview Preparation Tips
Skills evaluated in this interview
Selected
I applied via Campus Placement and was interviewed in Jul 2024. There were 4 interview rounds.
4 questions on codebyte platform
1 easy combination sum
2. medium spiral traversal
3. medium question based on backtracking
4. medium to hard question based on anagrams
(1 Question)
- Q1. Find element in rotated sorted array
- Ans.
Use binary search to find the target element in a rotated sorted array.
Perform binary search to find the pivot element where the array is rotated.
Based on the pivot element, determine which half of the array to search for the target element.
Continue binary search in the appropriate half of the array to find the target element.
(1 Question)
- Q1. In depth questions on core concepts, system design questions, resume deep dive
(1 Question)
- Q1. Tech+HR questions
Interview Preparation Tips
Skills evaluated in this interview
I applied via Campus Placement
90 mins, easy, Data structures and algorithm basics
(1 Question)
- Q1. Given an array, remove all duplicates in place
- Ans.
Remove duplicates from array of strings in place
Use a HashSet to keep track of unique elements
Iterate through the array and remove duplicates by checking if element is already in the HashSet
Update the array in place by shifting elements to fill in the removed duplicates
(1 Question)
- Q1. Caching and its uses
- Ans.
Caching is the process of storing data in a temporary location to reduce access time and improve performance.
Caching helps reduce the load on servers by serving frequently accessed data quickly
It can improve performance by reducing the time needed to retrieve data from the original source
Examples include browser caching, CDN caching, and database caching
(1 Question)
- Q1. Personality grading
Skills evaluated in this interview
I appeared for an interview in Dec 2024, where I was asked the following questions.
- Q1. Regarding the API structure and difference between post and put? ?client id secret key working for authentication.
- Q2. Difference between streams and for loop, Java coding optimization
- Ans.
Streams provide a functional approach to processing collections, while for loops offer imperative control over iteration.
Streams support functional programming, allowing operations like map, filter, and reduce.
For loops provide more control over iteration, including index manipulation.
Example of stream: List<String> names = Arrays.asList('Alice', 'Bob'); names.stream().filter(n -> n.startsWith('A')).forEach(Sy...
2 hours coding round, only 1 person out of 90 cleared
(1 Question)
- Q1. Asked loads of dsa, super technical questions
Selected
I applied via Referral and was interviewed in Apr 2024. There was 1 interview round.
(2 Questions)
- Q1. Experience and field Knowledge
- Q2. Roles and responsibilities
Interview Preparation Tips
4 dsa questions were asked in online coding round.
DSA question asked in the coding test.
I appeared for an interview in Nov 2024, where I was asked the following questions.
- Q1. 1 Cultural fit round.
- Q2. System Design Quesitons.
Selected
I applied via Campus Placement and was interviewed in Jul 2023. There were 4 interview rounds.
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.
(3 Questions)
- Q1. This round was supposed to be based on DSA. What is Time Complexity? Give examples.
- Ans.
Time complexity measures the amount of time an algorithm takes to complete as a function of the input size.
Time complexity is expressed using Big O notation (e.g., O(n), O(log n)).
O(1) - Constant time: Example - Accessing an element in an array by index.
O(n) - Linear time: Example - Finding an element in an unsorted array.
O(n^2) - Quadratic time: Example - Bubble sort algorithm.
O(log n) - Logarithmic time: Example - Bi...
- 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...
- 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...
- Q3. Given an array of numbers, find the smallest Prime Number. I had to write down the whole code.
- Ans.
Find the smallest prime number in a given array of numbers.
A prime number is greater than 1 and has no divisors other than 1 and itself.
Example: In the array [4, 6, 8, 3, 5], the smallest prime is 3.
To find the smallest prime, iterate through the array and check each number for primality.
Use a helper function to determine if a number is prime.
(4 Questions)
- 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 ...
- 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?
- 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...
- 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 ...
(7 Questions)
- Q1. Tell me about yourself.
- Q2. Technical Qualities. Professional Qualities.
- Q3. Some negative points about it
- Ans.
Full Stack Web Development has its challenges, including complexity, skill breadth, and project management issues.
Complexity: Managing both front-end and back-end can be overwhelming, leading to potential burnout.
Skill Breadth: Requires knowledge of multiple technologies (e.g., React, Node.js), making it hard to master any single one.
Project Management: Balancing tasks across the stack can lead to miscommunication and ...
- Q4. Personal and Family Background.
- Q5. Academic history. Achievements and Lows during Primary and Secondary school.
- 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.
- 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.
Interview Preparation Tips
For Technical 1, DSA is a must, know your basics. While optimizing a particular problem, try to use Hashmap.
For Technical 2, Know your project very well, If you have not contributed to your project, and if you are not eager to learn about it, then you are doomed for rejection. So learn about it.
And you always know that there is a certain part of the project which you could have designed well, So study about it, because they will ask you to optimize it.
For HR, be true and honest about yourself.
Skills evaluated in this interview
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based on 170 reviews
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