Druva Principal Engineer Interview Questions and Answers

Round duration - 40 minutes
Round difficulty - Medium

Asked about time complexity of algorithm, puzzles, DBMS, cutting edge technologies etc. What are indexes?

Q1. 
Flip Bits Problem Explanation
Given an array of integers ARR of size N, consisting of 0s and 1s, you need to select a sub-array and flip its bits. Your task is to return the maximum count of 1s that can b...read more
Ans. 
Given an array of 0s and 1s, find the maximum count of 1s by flipping a sub-array at most once.
• Iterate through the array and keep track of the maximum count of 1s obtained by flipping a sub-array.

• Consider flipping a sub-array from index i to j and calculate the count of 1s in the resulting array.

• Return the maximum count of 1s obtained by flipping a sub-array at most once.
Answered by AI
Add your answer

Round duration - 20 minutes
Round difficulty - Medium

Asked 1 standard algorithm

Q1. 
Number of Islands Problem Statement
You are provided with a 2-dimensional matrix having N rows and M columns, containing only 1s (land) and 0s (water). Your goal is to determine the number of islands in t...read more
Ans. 
Count the number of islands in a 2D matrix of 1s and 0s.
• Iterate through the matrix and perform depth-first search (DFS) to find connected 1s.

• Mark visited cells to avoid redundant traversal.

• Increment island count whenever a new island is encountered.
Answered by AI
Add your answer

Aptitude+coding was asked. Consider this as the very important selection criteria

Design test . Its very likely to be easy

Q1. Technical +HR was the last round. 1. Asked about SAP. 2.Basic python and oops concepts. 3.What does incture do 4. Will you accept any role we assign 5. How will your mechanical degree help us
Ans. Tell you are willing to later in training period you can request them to change your roles
Answered Anonymously
Add your answer
Q2. Why did you shift to mechanical
Add your answer
Q3. Be specific about this answer
Add your answer

Aptitude test was easy level and moderate level.

Coding test was held in the google form which was very easy.

Q1. What is volatile keyword?
Ans. 
The volatile keyword in software engineering is used to indicate that a variable's value can be modified by multiple threads.
• Volatile keyword ensures that the variable's value is always read from and written to the main memory, rather than cached in a thread's local cache.

• It is used to prevent unexpected behavior in multi-threaded environments where multiple threads may access and modify the same variable simultaneousl...read more
Answered by AI
Add your answer
Q2. What is abstract class
Ans. 
An abstract class is a class that cannot be instantiated and is meant to be subclassed.
• An abstract class can have abstract methods that must be implemented by its subclasses.

• An abstract class can also have non-abstract methods that can be inherited by its subclasses.

• An abstract class provides a common interface for its subclasses.

• An abstract class can have instance variables and constructors.

• An abstract class cannot be...read more
Answered by AI
Add your answer
Q3. Where do you use abstract class
Ans. 
Abstract classes are used to provide a common interface and partial implementation for related classes.
• Abstract classes are used when you want to create a base class that cannot be instantiated on its own but can be inherited by other classes.

• They are useful when you want to define common methods and properties that multiple related classes should have.

• Abstract classes can have both abstract and non-abstract methods.

• Ab...read more
Answered by AI
Add your answer

Not so much difficult. english comprehension matters for this test.

Q1. Departmental question asked.
Add your answer
Q2. What is C++ and what are the basics
Ans. 
C++ is a high-level programming language used for developing system software, application software, and video games.
• C++ is an extension of the C programming language

• It supports object-oriented programming concepts like classes, inheritance, polymorphism, etc.

• It is a compiled language and provides low-level memory manipulation features

• C++ is widely used in developing operating systems, device drivers, game engines, and ...read more
Answered by AI
Add your answer

Tudip is one of the company whose selection process is very easy only its PI may be quite hard

Pattern building logic building

Q1. Oops and your core programming
Add your answer