Romax Technology Interview Questions and Answers

Q1. What is a stack ? Write it implementation
Ans. 
A stack is a data structure that follows the Last In First Out (LIFO) principle.
• Stack is a collection of elements with two main operations: push (adds element) and pop (removes top element)

• Common implementations include using arrays or linked lists

• Example: Undo feature in text editors uses a stack to store previous states
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Q2. How could we optimize a stack optimization
Ans. 
Optimizing a stack involves reducing unnecessary operations and improving memory usage.
• Implementing tail call optimization to reduce stack space usage

• Using iterative algorithms instead of recursive ones to avoid stack overflow

• Minimizing the number of local variables stored on the stack

• Using dynamic memory allocation instead of fixed-size arrays to optimize memory usage
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Q1. Database query from 2 table without a common column
Ans. 
Use a JOIN statement to combine data from two tables without a common column.
• Use a JOIN statement to combine data from two tables based on a different column

• Specify the columns to select from each table in the query

• Use aliases to differentiate between columns with the same name in different tables
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Q2. Design a Flight booking system
Ans. 
Design a flight booking system with user authentication, flight search, booking, seat selection, and payment handling.
• Implement user authentication for secure access.

• Create a database of flights with availability and pricing.

• Allow users to search for flights based on criteria like date, destination, and number of passengers.

• Provide seat selection options for users during booking.

• Include a payment gateway for secure tra...read more
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Two coding questions of easy to moderate difficulty level, focusing on arrays and strings.

Q1. What is the Quick Sort algorithm?
Ans. 
Quick Sort is a popular sorting algorithm that uses a divide-and-conquer approach to sort elements in an array.
• Divides the array into two sub-arrays based on a pivot element

• Recursively sorts the sub-arrays

• Combines the sorted sub-arrays to produce the final sorted array

• Example: [3, 6, 8, 10, 1, 2, 1] -> [1, 1, 2, 3, 6, 8, 10]
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Q2. What is the merge sort algorithm and what is its time complexity?
Ans. 
Merge sort is a divide and conquer algorithm that divides the input array into two halves, sorts them recursively, and then merges them back together.
• Divide the input array into two halves

• Recursively sort each half

• Merge the sorted halves back together

• Time complexity is O(n log n)
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Q1. Tell me about your project
Ans. 
I developed a web application for tracking and managing inventory in a retail store.
• Used React.js for front-end development

• Implemented RESTful APIs using Node.js and Express for back-end

• Utilized MongoDB for database management
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Q2. Tell me what is flow of your project
Ans. 
The flow of the project involves requirements gathering, design, development, testing, deployment, and maintenance.
• Requirements gathering: Understand client needs and document project requirements.

• Design: Create a detailed design plan including architecture and user interface.

• Development: Write code based on design specifications.

• Testing: Conduct various tests to ensure the software functions correctly.

• Deployment: Rele...read more
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Q1. Find repeated nos in arrays
Ans. 
Find repeated numbers in arrays of strings
• Iterate through each string in the array

• Convert each string to an array of numbers

• Use a hash map to track the frequency of each number

• Identify and return the repeated numbers
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Q1. Current company work, reason for change, etc.
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Written test on Basics of c and c++ is asked.
Also be thorough with mathematical topics like vectors,calculus.

Q1. C++ basic questions Oops concepts
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Q2. Math questions on vectors and calculus Predict the output for a given program
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Q1. Sql joins and types of joins
Ans. 
SQL joins are used to combine rows from two or more tables based on a related column between them.
• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• INNER JOIN returns rows when there is at least one match in both tables.

• LEFT JOIN returns all rows from the left table and the matched rows from the right table.

• RIGHT JOIN returns all rows from the right table and the matched rows from the left table.

• F...read more
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Q2. Powerbi and done projects
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