Ebizon Net Info Digital Marketing Trainee Interview Questions and Answers

Round duration - 90 minutes
Round difficulty - Medium

Questions on aptitude, English, logical reasoning, C/C++ and 5 coding ques. (only pseudo code).

Q1. 
Minimum Jumps Problem Statement
Bob and his wife are in the famous 'Arcade' mall in the city of Berland. This mall has a unique way of moving between shops using trampolines. Each shop is laid out in a st...read more
Ans. 
Find the minimum number of trampoline jumps Bob needs to make to reach the final shop, or return -1 if it's impossible.
• Use Breadth First Search (BFS) algorithm to find the minimum number of jumps required.

• Keep track of the visited shops to avoid revisiting them.

• If a shop has an Arr value of 0, it is impossible to reach the final shop.

• Return -1 if the final shop cannot be reached.
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Q2. 
Smallest Window Problem Statement
Given two strings, S and X, your task is to find the smallest substring in S that contains all the characters present in X.
Example:
Input:
S = "abdd", X = "bd"
Outpu...read more
Ans. 
Find the smallest substring in S that contains all characters in X.
• Use a sliding window approach to find the smallest window in S containing all characters of X.

• Maintain a hashmap to keep track of characters in X and their frequencies in the current window.

• Slide the window to the right, updating the hashmap and shrinking the window until all characters in X are present.

• Return the smallest window found.

• Example: S = 'abd
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Q3. 
Rat in a Maze Problem Statement
You need to determine all possible paths for a rat starting at position (0, 0) in a square maze to reach its destination at (N-1, N-1). The maze is represented as an N*N ma...read more
Ans. 
Find all possible paths for a rat in a maze from start to destination.
• Use backtracking to explore all possible paths in the maze.

• Keep track of visited cells to avoid revisiting them.

• Return paths in alphabetical order as a list of strings.
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Round duration - 60 minutes
Round difficulty - Easy

Questions based on OOPS were asked in this round.

Q1. What is a virtual function?
Ans. 
A virtual function is a function in a base class that is declared using the keyword 'virtual' and can be overridden by a function with the same signature in a derived class.
• Virtual functions allow for dynamic polymorphism in C++

• They are used in inheritance to achieve runtime polymorphism

• Virtual functions are declared in a base class and can be overridden in derived classes

• They are called based on the type of object bei...read more
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Q2. What are the types of polymorphism in Object-Oriented Programming?
Ans. 
Types of polymorphism in OOP include compile-time (method overloading) and runtime (method overriding) polymorphism.
• Compile-time polymorphism is achieved through method overloading, where multiple methods have the same name but different parameters.

• Runtime polymorphism is achieved through method overriding, where a subclass provides a specific implementation of a method that is already defined in its superclass.

• Polymor...read more
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Q3. What is the difference between deep copy and shallow copy?
Ans. 
Deep copy creates a new object and recursively copies all nested objects, while shallow copy creates a new object and copies only the references to nested objects.
• Deep copy creates a new object and copies all nested objects, while shallow copy creates a new object and copies only the references to nested objects.

• In deep copy, changes made to the original object do not affect the copied object, while in shallow copy, ch...read more
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Round duration - 30 minutes
Round difficulty - Easy

HR round with typical behavioral problems.

Round duration - 60 minutes
Round difficulty - Easy

This was a written coding test with 2 coding questions to be solved in 60 minutes.

Q1. 
Find Missing Number In String Problem Statement
You have a sequence of consecutive nonnegative integers. By appending all integers end-to-end, you formed a string S without any separators. During this pro...read more
Ans. 
Given a string of consecutive nonnegative integers with one missing number, find the missing integer.
• Iterate through the string to find the missing number by checking the consecutive integers.

• If there is more than one missing number, all integers are present, or the string is invalid, return -1.

• Handle cases where the missing number is at the beginning or end of the sequence.

• Consider edge cases such as single-digit numb
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Q2. 
First Non-Repeating Character Problem Statement
You are given a string consisting of English alphabet characters. Your task is to identify and return the first character in the string that does not repeat...read more
Ans. 
The task is to find the first non-repeating character in a string, or return the first character if all characters repeat.
• Iterate through the string to count the frequency of each character

• Find the first character with a frequency of 1, or return the first character if no such character exists

• Handle both uppercase and lowercase characters separately

• Use a hashmap to store character frequencies efficiently
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Round duration - 60 minutes
Round difficulty - Medium

Technical interview round with questions around PHP and DBMS.

Q1. What is connection pooling?
Ans. 
Connection pooling is a technique used to manage a pool of database connections to improve performance and efficiency.
• Connection pooling reduces the overhead of opening and closing database connections for each request.

• It allows multiple clients to reuse a pre-established set of connections to the database.

• Connection pooling helps in improving the scalability and performance of applications by efficiently managing data...read more
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Q2. How would you create a singleton design pattern in PHP 5?
Ans. 
To create a singleton design pattern in PHP 5, use a private static variable to store the instance and a static method to retrieve it.
• Create a private static variable to store the instance of the class.

• Create a private constructor to prevent outside instantiation of the class.

• Create a static method to check if an instance already exists and return it, or create a new instance if it doesn't.
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Q3. Can you write code to connect PHP to MySQL?
Ans. 
Yes, PHP can be used to connect to MySQL by using MySQLi or PDO extensions.
• Use MySQLi extension to connect PHP to MySQL

• Use PDO extension to connect PHP to MySQL

• Example using MySQLi: $conn = new mysqli($servername, $username, $password, $dbname);

• Example using PDO: $conn = new PDO('mysql:host=$servername;dbname=$dbname', $username, $password);
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Q4. What are the different types of errors in PHP?
Ans. 
Different types of errors in PHP include syntax errors, runtime errors, and logical errors.
• Syntax errors: Occur when there is a mistake in the code syntax, preventing the script from running.

• Runtime errors: Happen during script execution, such as division by zero or calling a function that does not exist.

• Logical errors: Difficult to detect as the code runs without errors, but produces incorrect results.

• Fatal errors: St...read more
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Q5. How does session management work in PHP?
Ans. 
Session management in PHP involves storing user data on the server to maintain state between multiple requests.
• Sessions are started using session_start() function in PHP.

• Session data is stored on the server and a unique session ID is sent to the client's browser.

• Session variables can be set, accessed, and unset using $_SESSION superglobal array.

• Sessions can be destroyed using session_destroy() function.
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Round duration - 60 minutes
Round difficulty - Easy

This was a coding test where we had to solve 2 coding questions in 60 minutes.

Q1. 
Buy and Sell Stock Problem Statement
Imagine you are Harshad Mehta's friend, and you have been given the stock prices of a particular company for the next 'N' days. You can perform up to two buy-and-sell ...read more
Ans. 
The task is to determine the maximum profit that can be achieved by performing up to two buy-and-sell transactions on a given set of stock prices.
• Iterate through the array of stock prices to find the maximum profit that can be achieved by buying and selling stocks.

• Keep track of the maximum profit that can be obtained by performing up to two transactions.

• Consider all possible combinations of buying and selling stocks to...read more
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Q2. 
Subsequences of String Problem Statement
You are provided with a string 'STR' that consists of lowercase English letters ranging from 'a' to 'z'. Your task is to determine all non-empty possible subsequen...read more
Ans. 
Generate all possible subsequences of a given string.
• Use recursion to generate all possible subsequences by including or excluding each character in the string.

• Maintain a current index to keep track of the characters being considered.

• Append the current character to each subsequence generated so far.

• Recursively call the function with the next index to include the next character in subsequences.
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Round duration - 60 minutes
Round difficulty - Easy

This was a technical round where the interviewer asked me questions related to OS and Java.

Q1. What is the critical section problem?
Ans. 
The critical section problem is a synchronization issue in concurrent programming where multiple processes access shared resources.
• Critical section is a code segment that accesses shared resources and must be executed by only one process at a time.

• The goal is to prevent race conditions and ensure mutual exclusion.

• Solutions include using locks, semaphores, and mutex to control access to critical sections.

• Example: Multip...read more
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Q2. How can we create a thread in Java?
Ans. 
A thread in Java can be created by extending the Thread class or implementing the Runnable interface.
• Extend the Thread class and override the run() method

• Implement the Runnable interface and provide the implementation for the run() method

• Start the thread using the start() method
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Round duration - 30 minutes
Round difficulty - Easy

Typical HR round with behavioral questions.

Round duration - 60 minutes
Round difficulty - Medium

Technical round where the interviewer asked me questions based on data structures , algorithms and load balancer and session management.

Q1. 
Pair Sum Problem Statement
You are given an integer array 'ARR' of size 'N' and an integer 'S'. Your task is to find and return a list of all pairs of elements where each sum of a pair equals 'S'.
Note:
...read more
Ans. 
Find pairs of elements in an array that sum up to a given value, sorted in a specific order.
• Iterate through the array and use a hashmap to store the difference between the target sum and each element.

• Check if the difference exists in the hashmap, if so, add the pair to the result list.

• Sort the result list based on the criteria mentioned in the problem statement.
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Q2. 
Next Smallest Palindrome Problem Statement
Find the next smallest palindrome strictly greater than a given number 'N' represented as a string 'S'.
Explanation:
You are given a number in string format, a...read more
Ans. 
Find the next smallest palindrome greater than a given number represented as a string.
• Convert the string number to an integer for comparison.

• Increment the number until a palindrome greater than the input is found.

• Handle cases where the input is already a palindrome or has leading zeros.

• Return the next greater palindrome as a string.
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Round duration - 60 minutes
Round difficulty - Medium

Technical round where the interviewer asked me questions based on data structures , design patterns and php.

Q1. 
Check If Linked List Is Palindrome
Given a singly linked list of integers, determine if the linked list is a palindrome.
Explanation:
A linked list is considered a palindrome if it reads the same forwar...read more
Ans. 
Check if a given singly linked list of integers is a palindrome.
• Create a function to reverse the linked list.

• Use slow and fast pointers to find the middle of the linked list.

• Compare the first half of the linked list with the reversed second half to determine if it's a palindrome.
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Q2. Can you explain the implementation of the Singleton Design pattern?
Ans. 
Singleton Design pattern ensures a class has only one instance and provides a global point of access to it.
• Ensure the class has a private static instance variable.

• Provide a public static method to access the instance.

• Make the constructor private to prevent instantiation from outside the class.

• Lazy initialization can be used to create the instance only when needed.

• Thread safety considerations may be necessary in a multi
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Round duration - 60 minutes
Round difficulty - Medium

Technical round where the interviewer asked me questions based on Javascript, dbms, oops concepts and php.

Q1. Write a stored procedure to join two tables.
Ans. 
A stored procedure to join two tables in a database.
• Use the JOIN keyword to combine rows from two or more tables based on a related column between them.

• Specify the columns to be selected from each table in the SELECT statement.

• Use the ON keyword to specify the join condition.

• Consider using INNER JOIN, LEFT JOIN, RIGHT JOIN, or FULL JOIN based on the desired result.

• Test the stored procedure with sample data to ensure it
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Q2. What is the difference between an abstract class and an interface in Object-Oriented Programming?
Ans. 
Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructors, fields, and methods, while interface cannot have any implementation.

• A class can only extend one abstract class, but can implement multiple interfaces.

• Abstract classes are used to define common characteristics among subclasses, while interfaces are used to define a contract...read more
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Q3. How can you extract the domain name from a URL using jQuery?
Ans. 
Use jQuery to extract domain name from a URL
• Use the 'a' element to create a temporary link with the URL

• Access the 'hostname' property of the link to get the domain name

• Use regular expressions to extract the domain name from the URL
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Q4. What are closures in JavaScript?
Ans. 
Closures in JavaScript are functions that have access to variables from their outer scope even after the outer function has finished executing.
• Closures allow functions to access variables from their parent function even after the parent function has finished executing.

• They are created whenever a function is defined within another function.

• Closures are commonly used to create private variables and functions in JavaScrip...read more
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Round duration - 65 minutes
Round difficulty - Easy

There were 2 sections – 
Aptitude and Logical Reasoning and MCQ based on Java question ,C++, coding for 20 min and 45 min respectively.
Section A- Not very difficult to clear this round although less time was a problem.
Section B- It contains 15 multiple choice question on c/c++,java and 4 simple coding questions

Q1. 
Cycle Detection in a Singly Linked List
Determine if a given singly linked list of integers forms a cycle or not.
A cycle in a linked list occurs when a node's next points back to a previous node in the ...read more
Ans. 
Detect if a singly linked list forms a cycle by checking if a node's next pointer points back to a previous node.
• Traverse the linked list using two pointers, one moving at double the speed of the other.

• If the two pointers meet at any point, there is a cycle in the linked list.

• Use Floyd's Cycle Detection Algorithm for O(N) time complexity and O(1) space complexity.
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Round duration - 75 minutes
Round difficulty - Medium

It was an online coding test in which 3 coding question were given.

Q1. 
Smallest Window Problem Statement
Given two strings, S and X, your task is to find the smallest substring in S that contains all the characters present in X.
Example:
Input:
S = "abdd", X = "bd"
Outpu...read more
Ans. 
Find the smallest substring in string S that contains all characters in string X.
• Iterate through string S and keep track of characters in X found in a window

• Use two pointers to maintain the window and slide it to find the smallest window

• Return the smallest window containing all characters in X
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Q2. 
Smallest Integer Not Representable as Subset Sum
Given a non-decreasing sorted array ARR of N positive numbers, determine the smallest positive integer that cannot be expressed as the sum of elements from...read more
Ans. 
Find the smallest positive integer that cannot be expressed as the sum of elements from any proper subset of a non-decreasing sorted array of positive numbers.
• Start with the smallest possible integer that cannot be represented, which is 1.

• Iterate through the array and update the smallest integer that cannot be represented.

• If the current element is greater than the smallest integer that cannot be represented, return tha...read more
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Q3. 
Minimum Steps for a Knight to Reach Target
Given a square chessboard of size 'N x N', determine the minimum number of moves a Knight requires to reach a specified target position from its initial position...read more
Ans. 
Calculate the minimum number of moves a Knight needs to reach a target position on a chessboard.
• Implement a function that takes knight's starting position, target position, and chessboard size as input

• Use breadth-first search algorithm to find the shortest path for the Knight

• Consider all possible 8 movements of the Knight on the chessboard

• Return the minimum number of moves required for the Knight to reach the target po
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Round duration - 60 minutes
Round difficulty - Easy

It started with a discussion on the programs given in coding round. They asked me about my interest field after that they directly jumped into Networking, Linux and Ethical Hacking part looking my interest domain. They asked me various question on networking and linux.
Then they asked me to code a simple c program

Q1. 
Reverse Linked List Problem Statement
Given a singly linked list of integers, return the head of the reversed linked list.
Example:
Initial linked list: 1 -> 2 -> 3 -> 4 -> NULL
Reversed link...read more
Ans. 
Reverse a singly linked list of integers and return the head of the reversed linked list.
• Iterate through the linked list and reverse the pointers to point to the previous node.

• Keep track of the current, previous, and next nodes while reversing the linked list.

• Update the head of the reversed linked list as the last node encountered during reversal.
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Q2. What are the port numbers of protocols such as FTP and SMTP?
Ans. 
FTP uses port number 21 and SMTP uses port number 25.
• FTP uses port 21 for data transfer and port 20 for control information.

• SMTP uses port 25 for email communication.

• Understanding port numbers is important for network communication.
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Q3. Can you explain the OSI Model?
Ans. 
The OSI Model is a conceptual framework that standardizes the functions of a telecommunication or computing system into seven layers.
• The OSI Model stands for Open Systems Interconnection Model.

• It consists of seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer has specific functions and communicates with the adjacent layers.

• Example: Layer 1 (Physical) deals with physi...read more
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Q4. How do you copy files in Linux?
Ans. 
To copy files in Linux, you can use the 'cp' command.
• Use the 'cp' command followed by the source file and destination directory to copy a file.

• To copy a directory and its contents, use the '-r' flag with the 'cp' command.

• You can also use wildcards like '*' to copy multiple files at once.
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Round duration - 60 minutes
Round difficulty - Easy

Technical round with 3 problems based on DSA and Algorithms.

Q1. 
Smallest Integer Not Representable as Subset Sum
Given a non-decreasing sorted array ARR of N positive numbers, determine the smallest positive integer that cannot be expressed as the sum of elements from...read more
Ans. 
Find the smallest positive integer that cannot be expressed as the sum of elements from any proper subset of a given array.
• Sort the array in non-decreasing order.

• Iterate through the array and keep track of the smallest sum that can be formed.

• If the next element in the array is greater than the current sum + 1, then the answer is the current sum + 1.

• Return the answer as the smallest integer not representable as a subset
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Q2. 
Reverse Linked List Problem Statement
Given a singly linked list of integers, return the head of the reversed linked list.
Example:
Initial linked list: 1 -> 2 -> 3 -> 4 -> NULL
Reversed link...read more
Ans. 
Reverse a singly linked list of integers and return the head of the reversed linked list.
• Iterate through the linked list and reverse the pointers to point to the previous node instead of the next node.

• Use three pointers to keep track of the current, previous, and next nodes while reversing the linked list.

• Update the head of the reversed linked list to be the last node encountered during the reversal process.
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Q3. 
Smallest Window Problem Statement
Given two strings S and X containing random characters, the task is to find the smallest substring in S which contains all the characters present in X.
Input:
The first...read more
Ans. 
The task is to find the smallest substring in string S which contains all the characters present in string X.
• Iterate through string S and keep track of characters in X using a hashmap

• Use two pointers to maintain a sliding window and find the smallest window containing all characters in X

• Return the smallest window found
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Round duration - 60 minutes
Round difficulty - Easy

Technical round with questions based on OOPS and Angular.

Q1. What are the different OOP concepts?
Ans. 
OOP concepts include inheritance, encapsulation, polymorphism, and abstraction.
• Inheritance allows a class to inherit properties and behavior from another class.

• Encapsulation restricts access to certain components of an object, protecting its integrity.

• Polymorphism allows objects to be treated as instances of their parent class.

• Abstraction hides the complex implementation details of an object and only shows the necessar
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Round duration - 60 minutes
Round difficulty - Easy

Questions based on System Design, ajax, jquery were asked.

Q1. How would you design a traffic light system?
Ans. 
Designing a traffic light system involves creating a system that controls the flow of traffic at intersections.
• Divide the traffic light system into three main lights: red, yellow, and green.

• Implement timers to control the duration of each light.

• Include sensors to detect the presence of vehicles and pedestrians.

• Consider implementing a pedestrian crossing signal.

• Integrate a central control system to coordinate the timing
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Q2. How does AJAX work?
Ans. 
AJAX allows for asynchronous communication between client and server without needing to reload the entire page.
• AJAX stands for Asynchronous JavaScript and XML.

• It allows for sending and receiving data from a server without reloading the entire page.

• AJAX uses XMLHttpRequest object to make requests to the server.

• It can update parts of a web page without requiring a full page reload.

• Commonly used in web applications to pro
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Q3. What is the difference between AngularJS and jQuery?
Ans. 
AngularJS is a full-fledged MVC framework for building dynamic web applications, while jQuery is a lightweight library for DOM manipulation and event handling.
• AngularJS is a full-fledged MVC framework, providing features like two-way data binding, dependency injection, and routing.

• jQuery is a lightweight library primarily used for DOM manipulation and event handling.

• AngularJS is suitable for building single-page applic...read more
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