RSA Security Java Developer Interview Questions and Answers

Round duration - 75 minutes
Round difficulty - Medium

It was in the evening.
It consisted of 26 questions of easy to hard level.
It consisted of 25 MCQs and only 1 coding problem.

Q1. 
Author and Books Formatting
Given a structured list of books and their authors, format the information as specified.
Input:
The first line of input contains an integer ‘T' representing the number of tes...read more
Ans. 
The task is to format a list of authors and their books in a specific way as per the given input format.
• Parse the input to extract the number of test cases, number of authors, author names, and their respective books.

• Format the output by printing the author names and their books in the specified format.

• Ensure correct sequence and labeling of authors and books as per the example provided.

• Handle multiple test cases and a...read more
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Round duration - 15 minutes
Round difficulty - Medium

It was more of CV based round. A brief discussion on projects was there followed by some questions like why optum.

Q1. 
Delete a Node from a Linked List
You are provided with a linked list of integers. Your task is to implement a function that deletes a node located at a specified position 'POS'.
Input:
The first line co...read more
Ans. 
Implement a function to delete a node from a linked list at a specified position.
• Traverse the linked list to find the node at the specified position.

• Update the pointers of the previous and next nodes to skip the node to be deleted.

• Handle edge cases such as deleting the head or tail of the linked list.

• Ensure to free the memory of the deleted node to avoid memory leaks.
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Round duration - 15 minutes
Round difficulty - Easy

A short round where some basic dbms questions like procedure, cursor were asked. Then some questions on whether I would prefer working alone or in a team. Where I see myself in 5 years.

Q1. 
Graph Coloring Problem
You are given a graph with 'N' vertices numbered from '1' to 'N' and 'M' edges. Your task is to color this graph using two colors, such as blue and red, in a way that no two adjacen...read more
Ans. 
Given a graph with 'N' vertices and 'M' edges, determine if it can be colored using two colors without adjacent vertices sharing the same color.
• Use graph coloring algorithm like BFS or DFS to check if the graph can be colored with two colors without conflicts.

• Check if any adjacent vertices have the same color. If so, it is not possible to color the graph as described.

• If the graph has connected components, color each co...read more
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Round duration - 90 Minutes
Round difficulty - Easy

This round was also conducted on Metll platform. This round is totally based on coding. There are so many choices in language, so you can easily select the language in which you are comfortable in. There are three problems to solve. I choose Java 8 to solve the problems. The problems are ranging from easy to hard-

To find the maximum occurring character in a given string.
To find the factorial of a given number.
Count Derangements.

Q1. 
Count Derangements
Determine the number of derangements possible for a set of 'N' elements. A derangement is a permutation where no element appears in its original position.
Input:
An integer 'T' repres...read more
Ans. 
Count the number of derangements possible for a set of 'N' elements.
• Derangements are permutations where no element appears in its original position.

• Use the formula: !n = n! * (1 - 1/1! + 1/2! - 1/3! + ... + (-1)^n/n!).

• Calculate the derangements modulo (10^9 + 7) for each test case.
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Q2. 
Factorial Calculation Problem Statement
Develop a program to compute the factorial of a given integer 'n'.
The factorial of a non-negative integer 'n', denoted as n!, is the product of all positive integ...read more
Ans. 
Program to compute factorial of a given integer 'n', with error handling for negative values.
• Create a function to calculate factorial using a loop or recursion

• Check if input is negative, return 'Error' if true

• Handle edge cases like 0 and 1 separately

• Use long data type to handle large factorials
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Q3. 
Most Frequent Word Problem Statement
You are given two strings 'A' and 'B' composed of words separated by spaces. Your task is to determine the most frequent and lexicographically smallest word in string ...read more
Ans. 
Find the most frequent and lexicographically smallest word in string 'A' that is not present in string 'B'.
• Split strings 'A' and 'B' into words

• Count frequency of each word in 'A'

• Check if word is not in 'B' and is the most frequent and lexicographically smallest

• Return the word or -1 if no such word exists
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Round duration - 90 Minutes
Round difficulty - Easy

The interviewer was so polite. He firstly asks me to describe myself and then ask about my family. After that he ask which language I choose to solve problems in Coding round and why I choose that language. Then he started to ask the technical questions.