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I was interviewed in Feb 2022.
Round duration - 90 Minutes
Round difficulty - Easy
In this round, there are a total of 16 questions and the time given was 90 mins.
3 Coding questions – Easy, Medium, and Hard.
13 MCQs based on outputs, Computer fundamentals, Aptitude.
You are provided with an integer 'N'. For an 'N' x 'N' chessboard, determine how to position 'N' queens such that no queen can attack another queen on the chessboard.
The N Queens problem involves placing N queens on an N x N chessboard so that no two queens can attack each other.
Use backtracking to explore all possible configurations of queen placements.
Keep track of rows, columns, and diagonals to ensure no two queens are attacking each other.
Print all valid configurations of queen placements.
Given an integer array ARR
of size N
and an integer S
, your goal is to return a list of all pairs of elements such that the sum of elements of each pair equals S
.
Return pairs of elements in an array whose sum equals a given integer.
Iterate through the array and store elements in a hashmap.
For each element, check if the complement (S - current element) exists in the hashmap.
Return pairs that satisfy the condition, sorted as per the given rules.
You are given the arrival and departure times of N trains at a railway station for a particular day. Your task is to determine the minimum number of pl...
Determine the minimum number of platforms needed at a railway station based on arrival and departure times of trains.
Sort the arrival and departure times in ascending order.
Use two pointers to keep track of overlapping schedules.
Increment platform count when a new train arrives before the previous one departs.
Round duration - 120 minutes
Round difficulty - Easy
This round is an interesting experience to brainstorm, problem-solve and pair alongside a ThoughtWorks Developer that allows you to demonstrate hands-on coding, design, OOP, and solution skills on the code which you have submitted.The problem statement will be shared with you 20 minutes before the start time of the interview
Tip 1 : Prepare system design
Tip 2 : Practice coding questions
Tip 3 : Prepare and search previous interviews
Tip 1 : Have atleast 3 great project
Tip 2 : Write only what you know and prepare well
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I was interviewed before May 2021.
Round duration - 30 minutes
Round difficulty - Medium
Given a string S, your task is to recursively remove all consecutive duplicate characters from the string.
String S
Output string
Recursively remove consecutive duplicate characters from a string.
Use recursion to check if the current character is the same as the next character, if so, skip the next character
Base case: if the string is empty or has only one character, return the string
Recursive case: if the current character is the same as the next character, call the function recursively with the string excluding the next character
Round duration - 90 minutes
Round difficulty - Easy
You are provided with a string S
and an array of integers A
of size M
. Your task is to perform M
operations on the string as specified by the indices in array A
...
Perform a series of reverse string operations on a given string based on specified indices.
Iterate through the array of indices and reverse the substring of the string based on the given indices.
Ensure to reverse the substring from the starting index to len(S) - starting index - 1.
Continue the operations in the sequence specified by the array of indices to get the final string.
Round duration - 50 minutes
Round difficulty - Medium
Tip 1 : Prepare well for resume & confidence for basic part of CS.
Tip 2 : Good knowledge of skills set which mentioned in CV.
Tip 3 : Explain about projects which you have worked earlier & your roles and responsibilities.
Tip 1 : Mentioned all the skills & certificate till date update your resume every 3 month's.
Tip 2 : Proper skills set with project explanation and duration of project which you have worked on
I was interviewed in Sep 2020.
Round duration - 180 minutes
Round difficulty - Hard
Timing: 8 a.m. to 11a.m.
Environment was optimum.
No significant activity.
Given two strings S
and T
with lengths N
and M
respectively, your task is to find the "Edit Distance" between these strings.
The Edit Distance is defined as the minimum nu...
The task is to find the minimum number of operations required to convert one string into another using delete, replace, and insert operations.
Use dynamic programming to solve the problem efficiently.
Create a 2D array to store the minimum edit distance for substrings of the two input strings.
Iterate through the strings and update the array based on the operations needed for each character.
Return the value in the bottom ...
Round duration - 30 minutes
Round difficulty - Medium
Timing: 12:00 p.m. to 12:30 p.m.
The environment was quite good.
No significant activity.
Interviewers were very friendly. They were behaving like friends.
Round duration - 15 minutes
Round difficulty - Easy
Timing: 3:00 p.m. to 3:20 p.m.
Environment was very good.
No significant activity was monitored.
HR was very good and friendly.
Tip 1 : Do minimum 3 projects
Tip 2 : Prepare every topic of DSA for interview
Tip 3 : Hands on experience in performing MySql commands
Tip 1 : Be precise and don't bluff
Tip 2 : Learn atleast 2 programming languages
Tip 3 : Do projects on latest technologies like Artificial Intelligence and Machine Learning
I was interviewed in Aug 2021.
Round duration - 45 minutes
Round difficulty - Medium
Technical Interview round that lasted for about 45 minutes. Questions were based on Java, Java design Patterns and OOPS Concepts.
Static methods in interfaces are methods that can be called without creating an instance of the interface implementation.
Static methods in interfaces were introduced in Java 8.
They are used for providing utility methods that are related to the interface but do not require an instance of the implementing class.
Static methods in interfaces cannot be overridden by implementing classes.
Example: interface MyInterface { stat...
Java 8 was needed to introduce new features like lambda expressions, streams, and default methods.
Introduction of lambda expressions for functional programming
Streams API for processing collections in a functional style
Default methods in interfaces for backward compatibility
Improved performance with the introduction of the Nashorn JavaScript engine
Date and Time API for better handling of date and time operations
There are multiple ways to create a singleton pattern in Java, including using static initialization, lazy initialization, and enum.
Using static initialization: Create a private static instance of the class and a public static method to return that instance.
Lazy initialization: Create a private static instance of the class and a public static method to check if the instance is null before creating it.
Using enum: Create...
Round duration - 60 minutes
Round difficulty - Medium
Technical Interview round that lasted for about 45 minutes. Questions were based on Spring boot and Microservices Concepts.
Bridge Pattern decouples abstraction from implementation, while Adapter Pattern adapts an interface to another.
Bridge Pattern separates abstraction and implementation using composition, while Adapter Pattern adapts an interface to another without changing its original structure.
Bridge Pattern allows for changes in both abstraction and implementation independently, while Adapter Pattern allows incompatible interfaces to...
Difference between @RestController and @Controller in Spring Boot
1. @Controller is used to create web MVC controllers while @RestController is used to create RESTful web services.
2. @Controller returns the view to be rendered while @RestController returns the object and data is written directly to the HTTP response as JSON or XML.
3. @RestController is a specialized version of @Controller that includes @Controller and @...
Spring is a framework for building Java applications, while Spring Boot is an extension that simplifies the setup and configuration.
Spring is a comprehensive framework for building Java applications, providing features like dependency injection, aspect-oriented programming, and more.
Spring Boot is an extension of the Spring framework that aims to simplify the setup and configuration of Spring applications.
Spring Boot i...
Monolithic architecture is a single-tiered software application where all components are tightly coupled, while microservices architecture is a distributed approach where the application is broken down into smaller, loosely coupled services.
Monolithic architecture has a single codebase and database, while microservices have multiple smaller services with their own codebase and database.
Monolithic applications are harde...
Round duration - 30 minutes
Round difficulty - Easy
This was a typical HR round with some standard Behavioral questions
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
I was interviewed before Sep 2020.
Round duration - 360 minutes
Round difficulty - Hard
Timing- Any 6 hours of my choice in the 24 hour window. (10:00 p.m. to 4:00 a.m. I selected)
Environment was very friendly and easy to use.
No significant activity.
This was the only coding round.
You are given two integers DAY_HOURS
and PARTS
. The integer 'DAY_HOURS' represents the number of hours in a day, and the day can be divided into 'PARTS' equal parts. You...
Find total instances of equivalent prime groups in a day divided into equal parts.
Iterate through each part of the day and check for prime pairs in different parts
Use a helper function to check if a number is prime
Ensure the day is evenly divided by parts and each prime group has hours from different parts
Round duration - 10-15 minutes
Round difficulty - Easy
Timing- 12:15 p.m.
Environment was very good .
Not any significant activity.
The interviewer was very friendly and talked like friends.
Round duration - 20 minutes
Round difficulty - Medium
Timing- 12:30 p.m. to 12:45 p.m
Environment was very comfortable.
No other significant activity.
Interviewer was very good and talking very politely & friendly.
Tip 1 : Make sure what you have learnt in DSA you can do it practically by writing codes.
Tip 2 : Must have a hands-on experience in writing SQL commands.
Tip 3 : Do atleast 3-4 projects so that you have an option to explain any one of them if the interviewer asks.
Tip 1 : Write only true data in resume. Don't bluff as you may get caught which will be very embarrassing.
Tip 2 : Have some latest technology related projects in your resume.
I was interviewed in Dec 2020.
Round duration - 30 minutes
Round difficulty - Medium
It was in the morning about 10:00AM-10:40AM. The platform used for this round was hackerrank. There are 15 MCQ's which cover portions of Aptitude, Data Structures, DBMS, SQL
You are given an array 'ARR'
of size 'N'
consisting of positive integers. Your task is to determine the minimum number of operations required to make all elements in t...
Minimum number of operations to make all elements in the array equal by performing addition, subtraction, multiplication, or division.
Iterate through the array to find the maximum and minimum values.
Calculate the difference between the maximum and minimum values.
The minimum number of operations needed is the difference between the maximum and minimum values.
Round duration - 15 minutes
Round difficulty - Easy
It was in the night around 7:00PM-7:20PM. Platform used for this round was skype. Interviewer was very serious while taking my interview.
Tip 1 : Practice as much as you can
Tip 2 : Try to get a good hold in Data Structures
Tip 3 : Do atleast 2 projects
Tip 1 : It should not be too long or too short.
Tip 2 : Each skill should be mentioned properly.
I was interviewed before Sep 2020.
Round duration - 140 minutes
Round difficulty - Medium
Test timing was at 2:00 pm , it was conducted in a college and the environment was good for the test. Camera was a primary part of test, so no suspicious activity.
Given two numbers in the form of two arrays where each element of the array represents a digit, calculate the sum of these two numbers and return this sum as an ar...
Given two numbers represented as arrays, calculate their sum and return the result as an array.
Iterate through the arrays from right to left, adding digits and carrying over if necessary
Handle cases where one array is longer than the other by considering the remaining digits
Ensure the final sum array does not have any leading zeros
Round duration - 20 minutes
Round difficulty - Easy
The round was conducted at around 12 p.m. I was called at the college location and then it was conducted. The interviewer was quite polite and frank.
Round duration - 8 minutes
Round difficulty - Easy
This round was conducted right after finishing and clearing the technical round at the same place and on the same day.
Tip 1 : Practice atleast 2-3 Coding problems daily so your logic building becomes stronger.
Tip 2 : Exercise problems based on OOPS concepts and others too.
Tip 3 : If you can have your own project built, then it's the major point and will act as a plus point.
Tip 1 : Your resume should be in standard form, short and simple will be more effective.
Tip 2 : Whatever you have learned, you need to mention it in your resume as that will be your primary source of selection and having project on your resume is important.
I applied via Naukri.com and was interviewed in Jul 2020. There were 4 interview rounds.
I applied via Walk-in and was interviewed before May 2020. There was 1 interview round.
I applied via Campus Placement and was interviewed before Feb 2020. There were 4 interview rounds.
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