Riverbed Technology Developer Interview Questions and Answers

Object oriented programming,Data Structures,Lifecycle

Q1. What are your hobbies
Ans. 
My hobbies include playing guitar, reading books, and hiking.
• Playing guitar: I have been playing guitar for 5 years and enjoy learning new songs and techniques.

• Reading books: I love reading fiction and non-fiction books, especially in the science and technology genres.

• Hiking: Exploring nature and going on hikes is a great way for me to relax and stay active.
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Q2. What are your future goals
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My future goal is to become a senior software developer and contribute to the development of innovative software solutions.
• To gain expertise in new programming languages and technologies

• To lead a team of developers and mentor junior developers

• To continuously learn and stay updated with the latest industry trends

• To contribute to open-source projects and collaborate with other developers

• To improve my problem-solving and
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Round duration - 75 minutes
Round difficulty - Medium

Test Comprises of 3 coding questions and some MCQs

Round duration - 60 minutes
Round difficulty - Medium

2 coding questions of (1 easy and 1 medium level) on hackerrank code-pair with the Interviewer

Round duration - 60 minutes
Round difficulty - Easy

This Round was based on CS fundamentals and One coding question was there as a Code-pair.

Q1. 
Next Greater Element Problem Statement
Given a list of integers of size N, your task is to determine the Next Greater Element (NGE) for every element. The Next Greater Element for an element X is the firs...read more
Ans. 
Find the Next Greater Element for each element in a list of integers.
• Iterate through the list of integers from right to left.

• Use a stack to keep track of elements whose NGE is yet to be found.

• Pop elements from the stack until a greater element is found or the stack is empty.

• Assign the NGE as the top element of the stack or -1 if the stack is empty.
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Round duration - 90 minutes
Round difficulty - Medium

Total of 8 questions:

4 MCQ(oops and expected output type questions) + other 2 were coding questions, out of which one is some class implementation question.

Q1. 
Count Subarrays with Sum Divisible by K
Given an array ARR and an integer K, your task is to count all subarrays whose sum is divisible by the given integer K.
Input:
The first line of input contains an...read more
Ans. 
Count subarrays with sum divisible by K in an array.
• Iterate through the array and keep track of the running sum modulo K.

• Use a hashmap to store the frequency of remainders.

• For each prefix sum, check how many previous prefix sums have the same remainder.

• Return the total count of subarrays with sum divisible by K.
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Round duration - 60 minutes
Round difficulty - Easy

This round was with the USA team, the panel consisted of 2 members. It took place at around 9 PM IST. The interviewer's focus was on approach.

Q1. 
Sort an Array in Wave Form
You are given an unsorted array ARR. Your task is to sort it so that it forms a wave-like array.
Input:
The first line contains an integer 'T', the number of test cases.
For ea...read more
Ans. 
Sort an array in a wave-like pattern where each element is greater than or equal to its adjacent elements.
• Iterate through the array and swap elements at even indices with their adjacent odd indices to form a wave pattern.

• There can be multiple valid wave arrays, so any valid wave array is acceptable.

• Ensure the first element is greater than or equal to the second element to start the wave pattern.
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Q2. 
Convert a Number to Words
Given an integer number num, your task is to convert 'num' into its corresponding word representation.
Input:
The first line of input contains an integer ‘T’ denoting the number o...read more
Ans. 
Convert a given integer number into its corresponding word representation.
• Implement a function that takes an integer as input and returns the word representation of that number.

• Break down the number into its individual digits and convert each digit into its word form.

• Handle special cases like numbers between 10 and 19, and multiples of 10.

• Combine the word forms of individual digits to form the final word representation
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Round duration - 40 minutes
Round difficulty - Easy

It was a managerial round. The position of the person taking the interview was of a technical architect. As was informed by the recruiter, previously he was a technical architect at Amazon.

Q1. How does Facebook store comments in its database?
Ans. 
Facebook stores comments in its database using a combination of relational and non-relational databases.
• Comments are typically stored in a relational database like MySQL for structured data storage.

• For scalability and performance, Facebook may also use a NoSQL database like Cassandra or HBase for storing comments in a denormalized format.

• Metadata related to comments such as likes, timestamps, and user information may b...read more
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Q1. What are oops concepts in java, explain real time scenario
Ans. 
OOPs concepts in Java include inheritance, polymorphism, encapsulation, and abstraction.
• Inheritance allows a subclass to inherit properties and methods from a superclass.

• Polymorphism allows objects to take on multiple forms and behave differently based on their context.

• Encapsulation hides the implementation details of an object and only exposes necessary information.

• Abstraction allows for the creation of abstract class...read more
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Q2. Uses of interface, inheritance
Ans. 
Interfaces define contracts for behavior, while inheritance allows for code reuse and polymorphism.
• Interfaces allow for loose coupling and abstraction, enabling multiple implementations of the same behavior.

• Inheritance allows for code reuse and extension of existing classes, reducing code duplication.

• Polymorphism allows objects of different classes to be treated as if they were of the same class, simplifying code and i
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Q3. SQL query for join of tables
Ans. 
SQL query for joining tables
• Use JOIN keyword to combine two or more tables based on a related column

• Specify the columns to be selected using SELECT keyword

• Use ON keyword to specify the condition for joining the tables

• Different types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN
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Q4. Java concepts used in your project
Ans. 
Used Java concepts such as inheritance, polymorphism, and exception handling in my project.
• Implemented inheritance to create a base class and derived classes with specific functionalities.

• Utilized polymorphism to allow objects of different classes to be treated as if they were of the same class.

• Implemented exception handling to handle errors and prevent program crashes.

• Used interfaces to define a set of methods that a ...read more
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Q5. Overloading vs overriding, practical uses
Ans. 
Overloading is having multiple methods with the same name but different parameters. Overriding is having a method in a subclass with the same name and parameters as a method in the superclass.
• Overloading is used to provide different ways to call a method with different parameters

• Overriding is used to provide a specific implementation of a method in a subclass

• Overloading is resolved at compile-time while overriding is r...read more
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Q1. Basics of Opps virtual functions , destructor
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Q2. Basics of MFC and its structure
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Q1. Why are you looking for a change?
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Q2. What is that you bring skills to the table that can add value to the Company
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Q3. How can you bring value add to the Company
Ans. 
I can bring value to the company by leveraging my technical expertise and leadership skills to drive innovation and improve efficiency.
• Identifying and implementing new technologies to streamline processes

• Mentoring and coaching team members to enhance their skills and productivity

• Collaborating with cross-functional teams to develop and execute strategic plans

• Ensuring adherence to industry standards and best practices

• Con...read more
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Q1. What is your expectation?
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Q2. How long do you think will continue with the Company
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Q1. Java basic knowledge and deep knowledge
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Q2. Java, theory, oops, dbms
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Q1. What is cursor and types
Ans. 
A cursor is a pointer to a private SQL area that stores information about the processing of a SELECT or DML statement.
• A cursor is used to retrieve data row by row from a result set.

• There are two types of cursors: Implicit and Explicit.

• Implicit cursors are used for single-row queries, while explicit cursors are used for multi-row queries.

• Cursor variables can be used to pass cursors as parameters to procedures and functi
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Q2. Truncate & delete difference
Ans. 
Truncate removes all data from a table while delete removes specific rows.
• Truncate is faster than delete as it doesn't log individual row deletions

• Truncate cannot be rolled back while delete can be

• Truncate resets the identity of the table while delete doesn't

• Truncate doesn't fire triggers while delete does
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Q3. Explain about trigger
Ans. 
A trigger is a special type of stored procedure that automatically executes in response to certain events.
• Triggers are used to enforce business rules or to perform complex calculations.

• They can be defined to execute before or after a data modification operation.

• Triggers can be used to audit changes to data or to replicate data changes to other tables.

• Examples of events that can trigger a trigger include INSERT, UPDATE,...read more
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Q1. About your self
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Q2. About work experience
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Q3. About salary expectation
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