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I appeared for an interview before Dec 2020.
Round duration - 60 Minutes
Round difficulty - Medium
This round was purely based on Data Structures and Algorithms . One has to be fairly comfortable in solving Algorithmic problems to pass this round . Both the questions asked were quite common and luckily I had already prepared them from CodeStudio and LeetCode.
Given a Binary Tree with 'N' nodes, where each node holds an integer value, your task is to compute the In-Order, Pre-Order, and Post-Order traversals of the binar...
Compute the In-Order, Pre-Order, and Post-Order traversals of a Binary Tree given in level-order format.
Implement functions to perform In-Order, Pre-Order, and Post-Order traversals of a Binary Tree.
Use level-order input to construct the Binary Tree.
Traverse the Binary Tree recursively to generate the required traversals.
Ensure proper handling of null nodes represented by -1 in the input.
Return the three traversals as
Given a Singly Linked List of integers, your task is to reverse the Linked List by altering the links between the nodes.
The first line of input is an intege...
Reverse a singly linked list by altering the links between nodes.
Iterate through the linked list and reverse the links between nodes
Use three pointers to keep track of the current, previous, and next nodes
Update the links between nodes to reverse the list
Return the head of the reversed linked list
Round duration - 45 Minutes
Round difficulty - Medium
This round basically tested some concepts from Data Structures and File Manipulation .
Given two arrays A
and B
with sizes N
and M
respectively, both sorted in non-decreasing order, determine their intersection.
The intersection of two arrays in...
The problem involves finding the intersection of two sorted arrays efficiently.
Use two pointers to iterate through both arrays simultaneously.
Compare elements at the pointers and move the pointers accordingly.
Handle cases where elements are equal and update the intersection array.
Return the intersection array as the result.
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 applied via Campus Placement
Regex for email validation
Start with a string of characters followed by @ symbol
Followed by a string of characters and a period
End with a string of characters with a length of 2-6 characters
Allow for optional subdomains separated by periods
Disallow special characters except for . and _ in username
Print prime numbers in a given range and optimize the solution.
Use Sieve of Eratosthenes algorithm to generate prime numbers efficiently
Start with a boolean array of size n+1, mark all as true
Loop through the array and mark all multiples of each prime as false
Print all the indexes that are still marked as true
Find angle between hour and minute hand in a clock given the time.
Calculate the angle made by the hour hand with respect to 12 o'clock position
Calculate the angle made by the minute hand with respect to 12 o'clock position
Find the difference between the two angles and take the absolute value
If the angle is greater than 180 degrees, subtract it from 360 degrees to get the smaller angle
To un-hash a string, use a reverse algorithm to convert the hash back to the original string.
Create a reverse algorithm that takes the hash as input and outputs the original string
Use the same logic as the hash function but in reverse order
If the hash function used a specific algorithm, use the inverse of that algorithm to un-hash the string
Multithreading is the ability of a program to perform multiple tasks concurrently.
Multithreading allows for better utilization of CPU resources
It can improve program performance and responsiveness
Examples include running multiple downloads simultaneously or updating a GUI while performing a background task
Synchronization is important to prevent race conditions and ensure thread safety
Multithreading in Java allows concurrent execution of multiple threads.
Java provides built-in support for multithreading through the java.lang.Thread class.
Threads can be created by extending the Thread class or implementing the Runnable interface.
The start() method is used to start a new thread, which calls the run() method.
Synchronization mechanisms like synchronized blocks and locks can be used to control access to ...
No, Java does not support multiple inheritance. However, interfaces can inherit multiple interfaces.
Java does not allow a class to inherit from multiple classes.
This is because multiple inheritance can lead to ambiguity and conflicts.
However, a class can implement multiple interfaces in Java.
An interface can extend multiple interfaces, allowing for inheritance of multiple interfaces.
This is known as interface inheritan
DO-WHILE loop executes the code block at least once, while WHILE loop executes only if the condition is true.
DO-WHILE loop checks the condition at the end of the loop
WHILE loop checks the condition at the beginning of the loop
DO-WHILE loop executes the code block at least once
WHILE loop may not execute the code block at all if the condition is false
I would rate myself as an 8 on a scale of 1-10.
I have a strong understanding of software development principles and practices.
I have experience working with multiple programming languages and frameworks.
I am skilled in problem-solving and debugging.
I have successfully delivered complex software projects in the past.
I continuously strive to learn and improve my skills.
Display data of two tables by joining them using a common column.
Use SQL JOIN statement to combine data from two tables based on a common column.
Choose the appropriate type of JOIN based on the relationship between the tables.
Specify the columns to be displayed in the SELECT statement.
Use aliases to differentiate between columns with the same name in both tables.
Apply any necessary filters or sorting to the result set.
Networking refers to the process of connecting devices and systems to share information and resources.
Networking involves the use of hardware and software to connect devices and systems.
It allows for the sharing of information and resources such as files, printers, and internet access.
Networking can be done through wired or wireless connections.
Examples of networking technologies include Ethernet, Wi-Fi, and Bluetooth.
...
A router is a networking device that forwards data packets between computer networks.
A router operates at the network layer of the OSI model.
It uses routing tables to determine the best path for data packets to reach their destination.
Routers can connect multiple networks together, such as LANs and WANs.
They provide network address translation (NAT) to allow multiple devices to share a single public IP address.
Routers ...
Subnetting is the process of dividing a network into smaller subnetworks, called subnets, to improve network efficiency and security.
Subnetting allows for better utilization of IP addresses by dividing a network into smaller segments.
It helps in improving network performance by reducing network congestion.
Subnetting enhances network security by isolating different departments or devices within a network.
It enables effi...
Protocols are a set of rules and guidelines that govern the communication between devices or systems.
Protocols define the format and order of messages exchanged between devices.
They ensure reliable and efficient communication by specifying error detection and correction mechanisms.
Examples of protocols include TCP/IP, HTTP, SMTP, and FTP.
Protocols can operate at different layers of the network stack, such as the applic
Static protocols are fixed and do not change, while dynamic protocols can adapt to changing network conditions.
Static protocols are typically used in simple networks with predictable traffic patterns.
Dynamic protocols are used in complex networks with varying traffic patterns.
Examples of static protocols include ARP and RARP.
Examples of dynamic protocols include OSPF and BGP.
TCS is a leading global IT services company with a strong reputation and diverse opportunities for growth.
TCS has a strong reputation in the IT industry for delivering high-quality services and solutions.
TCS offers diverse opportunities for growth and career development.
TCS has a global presence, providing exposure to different cultures and working environments.
TCS values innovation and encourages employees to think cr...
I expect to receive proper training and support to transition into the IT field successfully.
I expect to be provided with relevant training and resources to learn the necessary skills for the role.
I hope for guidance and mentorship from experienced IT professionals within the company.
I am eager to contribute my non-IT skills and knowledge to the team, bringing a fresh perspective.
I am committed to putting in the effort...
Multithreading is the ability of a program to perform multiple tasks concurrently.
Multithreading allows for better utilization of CPU resources
It can improve program performance and responsiveness
Examples include running multiple downloads simultaneously or updating a GUI while performing a background task
Synchronization is important to prevent race conditions and ensure thread safety
Java supports multithreading through the java.lang.Thread class and java.util.concurrent package.
Java threads are created by extending the Thread class or implementing the Runnable interface.
Threads can be started using the start() method.
Synchronization can be achieved using synchronized keyword or locks.
Java provides several classes and interfaces to support concurrent programming such as Executor, ExecutorService, F...
Java does not support multiple inheritance, but interfaces can inherit multiple interfaces.
Java does not allow a class to inherit from multiple classes, but it can implement multiple interfaces.
Interfaces can inherit from multiple interfaces using the 'extends' keyword.
For example, interface C can extend interfaces A and B: 'interface C extends A, B {}'
Do-While loop executes the code block once before checking the condition, while loop checks the condition first.
Do-While loop is used when the code block needs to be executed at least once.
While loop is used when the code block may not need to be executed at all.
Do-While loop is less efficient than While loop as it always executes the code block at least once.
Example of Do-While loop: do { //code block } while (conditi...
Join the tables on a common column and display the combined data.
Identify the common column in both tables
Use JOIN statement to combine the tables
Select the columns to display
Apply any necessary filters or sorting
Display the data in a table or list format
Primary key uniquely identifies a record in a table, while unique key ensures uniqueness of a column.
Primary key cannot have null values, while unique key can have one null value.
A table can have only one primary key, but multiple unique keys.
Primary key is used as a foreign key in other tables, while unique key is not.
Example: Employee ID can be a primary key, while email address can be a unique key.
I have a strong background in software development, excellent problem-solving skills, and a passion for learning new technologies.
Extensive experience in programming languages such as Java, Python, and C++
Proven track record of delivering high-quality software solutions on time and within budget
Strong analytical and problem-solving skills, with the ability to quickly adapt to new technologies and frameworks
Excellent co...
My hobbies include coding, reading, and playing video games. My strengths are problem-solving, attention to detail, and teamwork. My weaknesses are impatience and a tendency to overthink.
Hobbies: Coding, reading, playing video games
Strengths: Problem-solving, attention to detail, teamwork
Weaknesses: Impatience, tendency to overthink
I am a software developer with experience in Java and Python.
Graduated with a degree in Computer Science
Worked on multiple projects using Java and Python
Familiar with Agile methodology
Strong problem-solving skills
Constantly learning and improving
Multithreading is the ability of a CPU to execute multiple threads concurrently.
Multithreading improves performance by utilizing idle CPU time.
Threads share the same memory space, allowing for efficient communication.
Examples include web servers handling multiple requests and video games rendering graphics while processing user input.
The question is asking about how a specific implementation is done in Java.
Explain the implementation details of the specific feature or functionality in Java
Provide code examples if applicable
Discuss any relevant libraries or frameworks used in the implementation
While loop executes only if the condition is true, do-while loop executes at least once before checking the condition.
While loop checks the condition first, then executes the code block
Do-while loop executes the code block first, then checks the condition
While loop may not execute at all if the condition is false initially
Do-while loop always executes at least once before checking the condition
No, Java does not support multiple inheritance. However, interfaces can inherit multiple interfaces.
Java does not allow a class to inherit from multiple classes, which is known as multiple inheritance.
However, a class can implement multiple interfaces, which is known as multiple interface inheritance.
By implementing multiple interfaces, a class can inherit the abstract methods defined in those interfaces.
For example, c...
To display data of two tables, we can use JOIN operation in SQL.
Identify the common column(s) between the two tables.
Use JOIN operation to combine the data from both tables based on the common column(s).
Choose the appropriate type of JOIN operation (INNER, LEFT, RIGHT, FULL) based on the requirement.
Use SELECT statement to display the required columns from the combined table.
Example: SELECT t1.column1, t2.column2 FROM ...
Primary key uniquely identifies a record in a table, while unique key ensures uniqueness of a column.
Primary key is a column or set of columns that uniquely identifies each record in a table
Primary key cannot have null values
A table can have only one primary key
Unique key ensures that a column or set of columns have unique values
Unique key can have null values
A table can have multiple unique keys
I would rate myself as an 8 on a scale of 1-10.
I have a strong understanding of software development principles and practices.
I have experience working with multiple programming languages and frameworks.
I am skilled in problem-solving and debugging.
I have successfully delivered complex software projects in the past.
I continuously strive to learn and improve my skills.
based on 5 interviews
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