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Mystifly Consulting Software Engineer Interview Questions, Process, and Tips

Updated 8 Aug 2022

Top Mystifly Consulting Software Engineer Interview Questions and Answers

  • Q1. On a dark night, 4 people want to cross a bridge and they have only one torch. At a time at max 2 people can cross the bridge. The time required for each individual to cr ...read more
  • Q2. 22. You are given two hourglasses, one of 11 minutes and the other of 7 minutes. How will you measure 4 minutes using it?
  • Q3. 3. Given a sorted array from 1 to n like 1,2,3 _ n there might be one number that is repeated so we return true if the array has a repeated number or return false if the ...read more
View all 40 questions

Mystifly Consulting Software Engineer Interview Experiences

2 interviews found

Round 1 - Technical 

(23 Questions)

  • Q1. 1. What is a linked list, its advantages and representation
  • Ans. 

    A linked list is a data structure that consists of a sequence of nodes, where each node contains a reference to the next node.

    • Advantages of linked list:

    • - Dynamic size: Linked lists can grow or shrink as needed.

    • - Efficient insertion and deletion: Adding or removing elements from a linked list is faster than an array.

    • - Flexibility: Linked lists can be easily modified and reorganized.

    • Representation of a linked list:

    • - Each...

  • Answered by AI
  • Q2. 2. Implement code of Fibonacci number using recursion
  • Ans. 

    Code for Fibonacci number using recursion

    • Define a function that takes an integer as input

    • If the input is 0 or 1, return the input

    • Else, return the sum of the function called with input-1 and input-2

    • Call the function with the desired input

  • Answered by AI
  • Q3. 3. Given a sorted array from 1 to n like 1,2,3 _ n there might be one number that is repeated so we return true if the array has a repeated number or return false if the array don't have a repeated number
  • Ans. 

    Check if a sorted array from 1 to n has a repeated number.

    • Iterate through the array and check if the current element is equal to the next element.

    • If yes, return true. If no, continue iterating.

    • If the loop completes without finding a repeated element, return false.

  • Answered by AI
  • Q4. 4. Given a string as an input, write a code to print the string in a manner such that a character that comes first in the string displays first with all occurrences in the string
  • Ans. 

    Print a string with all occurrences of the first character first.

    • Loop through the string and count the occurrences of the first character.

    • Print the first character that many times, then print the rest of the string.

  • Answered by AI
  • Q5. 5. Print Fibonacci Series.
  • Ans. 

    Print Fibonacci series using iterative or recursive approach.

    • Iterative approach: Use a loop to generate the series.

    • Recursive approach: Use a function to call itself to generate the series.

    • Start with 0 and 1, then add the previous two numbers to get the next number.

    • The series goes like this: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, ...

    • The series can be generated up to a certain limit or until a certain number is re

  • Answered by AI
  • Q6. 6. Describe OOPS concepts
  • Ans. 

    OOPS concepts are the principles of Object-Oriented Programming that focus on encapsulation, inheritance, polymorphism, and abstraction.

    • Encapsulation: bundling of data and methods that operate on that data within a single unit

    • Inheritance: ability of a class to inherit properties and methods from a parent class

    • Polymorphism: ability of objects to take on many forms or have multiple behaviors

    • Abstraction: hiding of complex...

  • Answered by AI
  • Q7. 7. What are Pillars of OOPS?
  • Ans. 

    Pillars of OOPS are the fundamental principles of Object-Oriented Programming.

    • Abstraction: Hiding implementation details and showing only necessary information.

    • Encapsulation: Binding data and functions together to protect data from outside interference.

    • Inheritance: Acquiring properties and behavior of a parent class by a child class.

    • Polymorphism: Ability of objects to take multiple forms or have multiple behaviors.

  • Answered by AI
  • Q8. 8 Explain Why OOPS Important
  • Ans. 

    OOPS is important for code reusability, maintainability, and extensibility.

    • Encapsulation ensures data security and prevents unwanted access.

    • Inheritance allows for code reuse and reduces redundancy.

    • Polymorphism enables flexibility and extensibility of code.

    • Abstraction simplifies complex systems and hides implementation details.

    • OOPS promotes modular design and improves code maintainability.

    • OOPS facilitates team collabora...

  • Answered by AI
  • Q9. 9. What are classes and objects?
  • Ans. 

    Classes are templates for creating objects. Objects are instances of classes that have their own properties and methods.

    • Classes define the properties and methods that objects of that class will have

    • Objects are instances of classes that can be created and manipulated in code

    • Classes and objects are fundamental concepts in object-oriented programming

    • Example: A class 'Car' can have properties like 'make', 'model', 'year',

  • Answered by AI
  • Q10. 10. What is a Constructor
  • Ans. 

    A constructor is a special method that is used to initialize objects in a class.

    • Constructors have the same name as the class they are in

    • They are called automatically when an object is created

    • They can take parameters to set initial values for object properties

  • Answered by AI
  • Q11. 11. Abstraction Vs Interface - Similarity And Difference
  • Ans. 

    Abstraction and interface are both used to achieve abstraction in programming.

    • Abstraction is the process of hiding implementation details while showing only the necessary information to the user.

    • Interface is a blueprint for a class that defines a set of methods and properties that the class must implement.

    • Abstraction can be achieved through abstract classes and interfaces.

    • Abstraction is a concept while interface is a l...

  • Answered by AI
  • Q12. 12. What is abstraction? Explain abstract class and interface - the difference between them.
  • Ans. 

    Abstraction is a way of hiding implementation details and showing only necessary information to the user.

    • Abstract class is a class that cannot be instantiated and can have both abstract and non-abstract methods.

    • Interface is a collection of abstract methods and constants that can be implemented by any class.

    • Abstract classes can have constructors, while interfaces cannot.

    • A class can implement multiple interfaces, but can...

  • Answered by AI
  • Q13. 13. Types of inheritance
  • Ans. 

    Types of inheritance in software engineering

    • Single inheritance: a class inherits from only one parent class

    • Multiple inheritance: a class inherits from multiple parent classes

    • Multilevel inheritance: a class inherits from a derived class, which in turn inherits from another class

    • Hierarchical inheritance: multiple classes inherit from a single parent class

    • Hybrid inheritance: a combination of multiple and multilevel inheri

  • Answered by AI
  • Q14. 14. Difference between structure and class
  • Ans. 

    Structures are value types while classes are reference types.

    • Structures are allocated on stack while classes are allocated on heap.

    • Structures do not support inheritance while classes do.

    • Structures cannot have destructors while classes can.

    • Structures are used for small data structures while classes are used for larger, more complex objects.

    • Structures are passed by value while classes are passed by reference.

  • Answered by AI
  • Q15. 15. What is a constructor and a destructor and how to represent them?
  • Ans. 

    Constructor and destructor are special member functions in a class that are used to initialize and destroy objects respectively.

    • Constructor is called when an object is created and is used to initialize the object's data members.

    • Destructor is called when an object is destroyed and is used to free up any resources allocated by the object.

    • Constructor has the same name as the class and no return type, while destructor has ...

  • Answered by AI
  • Q16. 16. What is encapsulation?
  • Ans. 

    Encapsulation is the process of hiding implementation details and exposing only necessary information.

    • Encapsulation is achieved through access modifiers like public, private, and protected.

    • It helps in achieving data abstraction and information hiding.

    • It prevents unauthorized access to the internal state of an object.

    • Example: A class with private variables and public methods to access them.

  • Answered by AI
  • Q17. 17. How to add a new column to an existing table, what is the command for that?
  • Ans. 

    To add a new column to an existing table, use the ALTER TABLE command.

    • Use the ALTER TABLE command followed by the table name.

    • Use the ADD keyword followed by the new column name and its data type.

    • Example: ALTER TABLE table_name ADD column_name data_type;

    • Make sure to specify any additional constraints or default values for the new column.

  • Answered by AI
  • Q18. 18. Query -- return customers who joined the company in march?
  • Ans. 

    Query to return customers who joined the company in March.

    • Use the WHERE clause to filter the join date by month

    • Assuming the join date is stored in a 'join_date' column

    • Example: SELECT * FROM customers WHERE MONTH(join_date) = 3

  • Answered by AI
  • Q19. 19. Seven layers of OSI
  • Ans. 

    The OSI model is a conceptual model that characterizes and standardizes the communication functions of a telecommunication or computing system.

    • The seven layers are: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

    • Each layer has a specific function and communicates with the layers above and below it.

    • The Physical layer deals with the physical transmission of data.

    • The Data Link layer provid...

  • Answered by AI
  • Q20. 20. Protocol used in the application layer
  • Ans. 

    The application layer uses various protocols such as HTTP, FTP, SMTP, etc.

    • HTTP (Hypertext Transfer Protocol) is used for web browsing

    • FTP (File Transfer Protocol) is used for file transfer

    • SMTP (Simple Mail Transfer Protocol) is used for email communication

    • POP3 (Post Office Protocol version 3) is used for retrieving emails

    • IMAP (Internet Message Access Protocol) is used for accessing emails on a server

    • DNS (Domain Name Sys...

  • Answered by AI
  • Q21. 21. Difference between TCP and UDP
  • Ans. 

    TCP is a connection-oriented protocol while UDP is connectionless.

    • TCP provides reliable, ordered, and error-checked delivery of data while UDP does not guarantee any of these.

    • TCP is slower but more reliable while UDP is faster but less reliable.

    • TCP is used for applications that require high reliability and accuracy while UDP is used for applications that require speed and efficiency.

    • Examples of TCP-based applications i...

  • Answered by AI
  • Q22. 22. You are given two hourglasses, one of 11 minutes and the other of 7 minutes. How will you measure 4 minutes using it?
  • Ans. 

    To measure 4 minutes using two hourglasses of 11 and 7 minutes, start both hourglasses simultaneously and flip the 7-minute hourglass when it runs out. When the 11-minute hourglass runs out, 4 minutes will have passed.

    • Start both hourglasses simultaneously

    • When the 7-minute hourglass runs out, flip it

    • When the 11-minute hourglass runs out, 4 minutes will have passed

  • Answered by AI
  • Q23. 23. Water Jug Puzzle: You are given 2 Jugs, one is 4 and the other of 7 Gallon and you need to measure x gallons of water.
Round 2 - Technical 

(18 Questions)

  • Q1. 1. Count Set Bit.......
  • Q2. 2. Program ATM Machine To Give Only 500 And 100 And Count There Number
  • Ans. 

    Program an ATM machine to dispense only 500 and 100 notes and count their number.

    • Create a function to dispense money

    • Use a loop to count the number of notes

    • Use if statements to check if the amount is divisible by 500 or 100

    • Display the total number of notes dispensed

  • Answered by AI
  • Q3. 3. Program to find the Binary Format of 4, 7
  • Ans. 

    Program to find binary format of 4 and 7.

    • Convert decimal numbers to binary using bitwise operator.

    • Print the binary format of the numbers.

    • Use printf or cout to display the output.

  • Answered by AI
  • Q4. 4. Print Fibonacci Series iteratively and recursively. You will be given 2 numbers and you will have to print all the Fibonacci digits between them.
  • Ans. 

    Print Fibonacci Series between two given numbers iteratively and recursively.

    • Iteratively, use a loop to generate Fibonacci numbers until the upper limit is reached.

    • Recursively, use a function to generate Fibonacci numbers until the upper limit is reached.

    • Store the generated Fibonacci numbers in an array and print them between the given numbers.

  • Answered by AI
  • Q5. 5. Palindrome Check.
  • Q6. 6. All Traversals of a tree.
  • Ans. 

    All possible ways to traverse a tree.

    • Pre-order traversal: root, left, right

    • In-order traversal: left, root, right

    • Post-order traversal: left, right, root

    • Level-order traversal: breadth-first search

    • Reverse level-order traversal: depth-first search

  • Answered by AI
  • Q7. 7. Finding Loop in Linked List
  • Ans. 

    To find a loop in a linked list, use Floyd's cycle-finding algorithm.

    • Floyd's algorithm uses two pointers, one moving at twice the speed of the other.

    • If there is a loop, the faster pointer will eventually catch up to the slower one.

    • To determine the start of the loop, reset one pointer to the beginning and move both at the same speed.

  • Answered by AI
  • Q8. 8. Height of a Tree.
  • Ans. 

    Height of a tree refers to the maximum number of edges from the root node to any leaf node in the tree.

    • Height of a tree can be calculated recursively by finding the height of left and right subtrees and adding 1 to the maximum of the two heights.

    • Height of a tree can also be calculated iteratively using level order traversal.

    • Height of a tree with only one node is 0.

    • Height of an empty tree is -1.

  • Answered by AI
  • Q9. 9. If you need to perform a lot of insertion and delete operations then which Data Structure will you use?
  • Ans. 

    I would use a Linked List data structure for frequent insertion and deletion operations.

    • Linked Lists have constant time complexity for insertion and deletion operations.

    • Arrays have a linear time complexity for these operations.

    • Doubly Linked Lists allow for efficient deletion of nodes.

    • Examples of use cases include implementing a queue or stack.

  • Answered by AI
  • Q10. 10. An array contains numbers from 1 to n. All the numbers occur twice in the array except any one element. Find the element which occurs only once.
  • Ans. 

    Find the element that occurs only once in an array of numbers from 1 to n with all other numbers occurring twice.

    • Use XOR operation to find the unique element.

    • Iterate through the array and XOR each element with the result.

    • The final result will be the unique element.

  • Answered by AI
  • Q11. 11. Define Abstraction, Inheritance, Runtime Polymorphism.
  • Ans. 

    Abstraction: hiding implementation details. Inheritance: creating new classes from existing ones. Polymorphism: same method, different behavior.

    • Abstraction: Focuses on what an object does instead of how it does it.

    • Inheritance: Allows a new class to be based on an existing class.

    • Runtime Polymorphism: Same method can be used for different objects, with different behavior.

    • Example: A car is an abstraction of a vehicle. Sed...

  • Answered by AI
  • Q12. 12. What Is DBMS?????
  • Ans. 

    DBMS stands for Database Management System. It is a software system that manages and organizes data in a database.

    • DBMS is used to create, modify, and delete databases and their objects.

    • It provides a way to store, retrieve, and manipulate data efficiently.

    • Examples of DBMS include MySQL, Oracle, SQL Server, and MongoDB.

  • Answered by AI
  • Q13. 13. SQL Queries?????????
  • Q14. 14. Primary Key vs. Unique Key?
  • Ans. 

    Primary key uniquely identifies a record in a table, while unique key ensures uniqueness of a column.

    • Primary key can't 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: Primary key - employee_id in employee table. Unique key - email in employee table.

  • Answered by AI
  • Q15. 15. Define Constraints???????
  • Ans. 

    Constraints are limitations or restrictions that are put on a system or process.

    • Constraints can be related to time, resources, budget, or technology.

    • They can be imposed by external factors such as regulations or internal factors such as company policies.

    • Examples of constraints in software development include limited memory or processing power, compatibility with existing systems, and security requirements.

  • Answered by AI
  • Q16. 16. What Are OS And OS Responsibly?
  • Ans. 

    OS stands for Operating System. It is responsible for managing computer hardware and software resources.

    • OS is the interface between the user and the computer hardware.

    • It manages memory, processes, and input/output devices.

    • Examples of OS include Windows, macOS, and Linux.

    • OS is responsible for providing security and managing user accounts.

    • It also provides a platform for running applications and software.

  • Answered by AI
  • Q17. 17. What is MultiThreading?
  • Ans. 

    Multithreading is the ability of a CPU to execute multiple threads concurrently.

    • Multithreading allows for better utilization of CPU resources.

    • It can improve application performance by allowing multiple tasks to run simultaneously.

    • Multithreading can also lead to synchronization issues and race conditions.

    • Examples of multithreaded applications include web servers, video games, and media players.

  • Answered by AI
  • Q18. 18. MultiThreading Vs MultiTasking?
  • Ans. 

    Multithreading is the ability of a CPU to run multiple threads concurrently, while multitasking is the ability of an OS to run multiple processes concurrently.

    • Multithreading is at the CPU level, while multitasking is at the OS level.

    • Multithreading allows multiple threads to share the same memory space, while multitasking requires separate memory spaces for each process.

    • Multithreading is used for improving performance a...

  • Answered by AI
Round 3 - Puzzles Interview 

(1 Question)

  • Q1. On a dark night, 4 people want to cross a bridge and they have only one torch. At a time at max 2 people can cross the bridge. The time required for each individual to cross the bridge is 1, 2, 5, and 10 m...
Round 4 - HR 

(5 Questions)

  • Q1. 1. Introduce and tell me something about yourself.
  • Ans. 

    I am a software engineer with 5 years of experience in developing web applications using Java and JavaScript.

    • I have a strong background in object-oriented programming and software development principles.

    • I am proficient in Java, JavaScript, and related frameworks such as Spring and React.

    • I have experience in designing and implementing RESTful APIs.

    • I am familiar with Agile methodologies and have worked in Scrum teams.

    • I h...

  • Answered by AI
  • Q2. 2. What are your strength and weakness?
  • Ans. 

    My strength is problem-solving and my weakness is perfectionism.

    • Strength: Strong problem-solving skills

    • Strength: Ability to work well in a team

    • Weakness: Perfectionism

    • Weakness: Difficulty in delegating tasks

  • Answered by AI
  • Q3. 3. What do you think mystify is doing?
  • Ans. 

    Mystify is likely a function or method that performs a complex or obscure operation.

    • Mystify could be encrypting or obfuscating data.

    • It might be performing a transformation or manipulation on data.

    • Mystify could be generating random or unpredictable outputs.

  • Answered by AI
  • Q4. 4. Why do you want to join our company?
  • Ans. 

    I want to join your company because of its reputation for innovation and the opportunity to work on cutting-edge projects.

    • Reputation for innovation

    • Opportunity to work on cutting-edge projects

  • Answered by AI
  • Q5. 5. Why should we hire you?
  • Ans. 

    You should hire me because I have a strong technical background, excellent problem-solving skills, and a passion for software development.

    • I have a Bachelor's degree in Computer Science and extensive experience in software development.

    • I have a deep understanding of various programming languages and frameworks, including Java, Python, and JavaScript.

    • I have a proven track record of delivering high-quality software solutio...

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - JAVA or PYTHON is PREFERRED BY THEM. Also, OS DBMS may be asked to a few students so be ready for it.

Make sure you maintain a Structured flow while learning. Solve Striver 180 Questions, they are a great practice resource for DSA. Don't try and add something to your resume so that it looks fancier, it might cause trouble during the interview. Only add skills and topics if you have good knowledge about them.

Separately try and prepare for puzzles as well. During the interview, Keep Your Head Cool, also while explaining your approach to the interviewer, it would be great if you explain it with some examples, this will make it easier for him to understand your approach.

Skills evaluated in this interview

I applied via Job Portal and was interviewed before Aug 2021. There were 2 interview rounds.

Interview Preparation Tips

Topics to prepare for Mystifly Consulting Software Engineer interview:
  • Java
  • OOPS
  • Resume
  • Data Structures
  • Algorithms
Interview preparation tips for other job seekers - Just go through the java basics, be confident and explain projects.

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Interview questions from similar companies

Interview Preparation Tips

Skill Tips: To crack Yatra interview Java, Data Structures and Algorithms concepts should be clear.
Skills: Java, Data structures, Algorithm
College Name: na

I appeared for an interview before Feb 2021.

Round 1 - Coding Test 

(3 Questions)

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...

  • 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.

  • Answered by AI
  • 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...
  • 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

  • Answered by AI
  • 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...

  • 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.

  • Answered by AI
Round 2 - Face to Face 

(3 Questions)

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...

  • Answered by AI
  • 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...

  • Answered by AI
  • 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...

  • Answered by AI
Round 3 - HR 

Round duration - 30 minutes
Round difficulty - Easy

HR round with typical behavioral problems.

Interview Preparation Tips

Eligibility criteriaAbove 7 CGPAMakeMyTrip interview preparation:Topics to prepare for the interview - Data Structures, Algorithms, System Design, Aptitude, OOPSTime required to prepare for the interview - 5 monthsInterview preparation tips for other job seekers

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.

Application resume tips for other job seekers

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.

Final outcome of the interviewSelected

Skills evaluated in this interview

I appeared for an interview before Feb 2021.

Round 1 - Coding Test 

(1 Question)

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 ...

  • 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.

  • Answered by AI
Round 2 - Coding Test 

(3 Questions)

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...
  • 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

  • Answered by AI
  • 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...

  • 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...

  • Answered by AI
  • 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...

  • 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

  • Answered by AI
Round 3 - Face to Face 

(4 Questions)

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...
  • 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.

  • Answered by AI
  • 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.

  • Answered by AI
  • 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...

  • Answered by AI
  • 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.

  • Answered by AI

Interview Preparation Tips

Eligibility criteriaAbove 7 CGPAMakeMyTrip interview preparation:Topics to prepare for the interview - Data Structures, Algorithms, System Design, Aptitude, OOPSTime required to prepare for the interview - 4 monthsInterview preparation tips for other job seekers

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.

Application resume tips for other job seekers

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.

Final outcome of the interviewSelected

Skills evaluated in this interview

Interview Questionnaire 

8 Questions

  • Q1. Find out the subset of an array of continuous positive numbers from a larger array whose sum of of the elements is larger in comparision to other subset. eg: {1,2 5 -7, 2 5} .The two subarrays are {1,2,5} ...
  • Ans. 

    Find the subset of an array with the largest sum of continuous positive numbers.

    • Iterate through the array and keep track of the current sum and the maximum sum seen so far.

    • If the current element is positive, add it to the current sum. If it is negative, reset the current sum to 0.

    • Also keep track of the start and end indices of the maximum sum subset.

    • Return the subset using the start and end indices.

  • Answered by AI
  • Q2. Given two classes C1 and C2 which are almost same.(remember not exactly same). You want to choose best among these classes so that it can be use as key in hashmap. What question will you ask regarding two ...
  • Q3. You are given two strings s1 and s2.Now, find the smallest substring in s1 containing all characters of s2
  • Ans. 

    Find smallest substring in s1 containing all characters of s2.

    • Create a hash table of characters in s2

    • Use sliding window technique to find smallest substring in s1

    • Check if all characters in s2 are present in the substring

    • Update the smallest substring if a smaller one is found

  • Answered by AI
  • Q4. Questions on OOPS (almost all the concepts were covered like polymorphism, overriding, overloading, inheritance, concept of virtual fxns etc.)
  • Q5. Write algo for reversing a linked list
  • Ans. 

    Algorithm to reverse a linked list

    • Create a new empty linked list

    • Traverse the original linked list and insert each node at the beginning of the new list

    • Return the new list

  • Answered by AI
  • Q6. What is lazy loading? Advantages and disadvantages of the same?
  • Ans. 

    Lazy loading is a technique used to defer the loading of non-critical resources until they are needed.

    • Advantages: faster initial page load, reduced bandwidth usage, improved user experience

    • Disadvantages: increased complexity, potential for slower subsequent page loads, difficulty with SEO

    • Examples: images, videos, and other media files can be loaded only when they are visible on the screen

  • Answered by AI
  • Q7. How ajax works? Difference between angular js and jquery?
  • Ans. 

    Ajax is a technique for creating fast and dynamic web pages. AngularJS is a framework for building dynamic web applications, while jQuery is a library for simplifying HTML DOM traversal and manipulation.

    • Ajax stands for Asynchronous JavaScript and XML

    • It allows web pages to be updated asynchronously by exchanging data with a web server behind the scenes

    • AngularJS is a JavaScript framework that extends HTML with new attrib...

  • Answered by AI
  • Q8. Design a traffic light system?
  • Ans. 

    A traffic light system controls the flow of traffic at intersections.

    • The system consists of three lights: red, yellow, and green.

    • Each light has a specific duration for which it stays on.

    • The system also includes sensors to detect the presence of vehicles and pedestrians.

    • The duration of each light can be adjusted based on traffic patterns.

    • The system can be connected to a central control system for remote monitoring and m

  • Answered by AI

Interview Preparation Tips

Skills: Javascript, Ajax, Angular JS, Jquery
College Name: na

Skills evaluated in this interview

I appeared for an interview before Feb 2021.

Round 1 - Face to Face 

(3 Questions)

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...

  • 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

  • Answered by AI
  • 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...
  • 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.

  • Answered by AI
  • 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...
  • 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

  • Answered by AI
Round 2 - Face to Face 

(1 Question)

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

  • Answered by AI
Round 3 - Face to Face 

(3 Questions)

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

  • Answered by AI
  • 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

  • Answered by AI
  • 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...

  • Answered by AI

Interview Preparation Tips

Eligibility criteriaAbove 7 CGPAMakeMyTrip interview preparation:Topics to prepare for the interview - Javascript, Ajax, Angular JS, Jquery, Data Structures, Algorithms, System Design, OOPSTime required to prepare for the interview - 6 monthsInterview preparation tips for other job seekers

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.

Application resume tips for other job seekers

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.

Final outcome of the interviewRejected

Skills evaluated in this interview

Interview Preparation Tips

Round: Test
Experience: 1. Rotate a matrix by 90 degrees clockwise.( He asked me have you heard of question.I said Yes.Then he asked me to code)2. Find vertical sum of nodes present in same vertical line in binary tree. ( He again asked me have you heard of question. I have heard it but didn’t remember the approach. It took some time and then I started telling my approach.He aasked me to write code and question regarding get sums from left to right , for which I made use of linked hashmap)
Overall It was very cool for me
Total Questions: 2

Round: Test
Experience: 1.Reverse K blocks of nodes in linked list.There are two interviewers this time, probably, guy was senior he was asking me question.He was very particular in coding. Checked every edge case.and asked me evrything.Initially I told the approach and then started coding.2.Find min in stack in O(1)Pretty straightforward written code.Again he checked all edge cases with my code.3. Then asked about counting sort and its code.4. And a simple question on array sorting.

Round: HR Interview
Experience: I thought this was last round as they have said like.She asked me about my strengths and challenges I faced.How I overcame through it1.Basic question on oops concepts.(runtime polymorphism).
2.Design tables for getting all employees under manager. I screwed it little bit.But some how I got answer which I was not satisfied as well.I was expecting result either yes/no.But they called me for another round of interview may be because of my expected salary which was high compared to my previous.

Round: Technical Interview
Experience: 1.Given “aaabbbccc” it should return “a3b3c3″ in place. Initially I explained brute force approach then he said array has 2n space.I was able to remember approach for quicksort and started explaining after which I grew confident on it.He was satisfied.Questions on time complexity of algo and space complexity discussions.2.Again a question on OOPs.This time I was completely wrong in answering it.I thought interview with yatra was closing for me.He was not satisified much with this.Luckily, there was another round with manager.

Round: Other Interview
Experience: 1.He asked me to find words which are having particular pattern.Then I said it was KMP algo. Can I explain it ?? I started explaining approach, may be he was busy with something, he asked me to write pseudo code.He left the room for 15 mins then he came back I had almost completed the code, which he was satisified.Some basic questions on spring ( my previous work was related to it). Then my expected salary and my position If I got selected in yatra were discussed.

College Name: NA

I appeared for an interview in Aug 2016.

Interview Preparation Tips

Round: Test
Experience: The questions were tricky. We were given a paragraph and after reading it, a statement was given to us and we were asked to say if it is true, false or cannot say. The structure of the statement put us into a a tough place. So practice of such kind of questions is necessary.

For data interpretation questions a good hand on basic statistical mathematics is needed. One has to be quick because of the time crunch. The questions were approachable

Round: Technical Interview
Experience: In this round my resume was scanned and I was required to speak about myself, my projects and explain certain areas of my resume. The interviewer picked up one of my basic project, surprisingly, and asked me to elaborate on it. He asked me how I can improve the project. And I had to write a code to make that change. Basically, one should have a good idea about the projects they've done/ mentioned in their resume. And know it in detail.

Few questions on data structures. Prepare well for coding type questions and data structures.

Round: Puzzle Interview
Experience: The interviewer asked me two puzzles. They were moderate level. And also luckily he was helpful whenever I got stuck.

Round: HR Interview
Experience: HR round was good. Basic questions like " tell me more about yourself", brief information about my past history, college life, extra curricular activities. In the end she asked me, "should we hire you?" And I lightly answered " why not!" So it was a good interview overall.

Skills: Coding Skills, Team Working Ability, Project management
College Name: Visvesvaraya National Institute Of Technology

Interview Questionnaire 

1 Question

  • Q1. DS and Algo
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Mystifly Consulting Interview FAQs

How many rounds are there in Mystifly Consulting Software Engineer interview?
Mystifly Consulting interview process usually has 3 rounds. The most common rounds in the Mystifly Consulting interview process are Technical, Puzzles Interview and HR.
How to prepare for Mystifly Consulting Software Engineer interview?
Go through your CV in detail and study all the technologies mentioned in your CV. Prepare at least two technologies or languages in depth if you are appearing for a technical interview at Mystifly Consulting. The most common topics and skills that interviewers at Mystifly Consulting expect are Java, Microservices, NoSQL, Rabbitmq and Scalability.
What are the top questions asked in Mystifly Consulting Software Engineer interview?

Some of the top questions asked at the Mystifly Consulting Software Engineer interview -

  1. On a dark night, 4 people want to cross a bridge and they have only one torch. ...read more
  2. 22. You are given two hourglasses, one of 11 minutes and the other of 7 minutes...read more
  3. 3. Given a sorted array from 1 to n like 1,2,3 _ n there might be one number th...read more

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