Hewlett Packard Enterprise Software Developer Interview Questions, Process, and Tips

Multiple choice questions

Q1. Design a classroom management system
Ans. 
A classroom management system to track student attendance, grades, assignments, and communication with parents.
• Track student attendance using RFID cards or biometric scanners

• Record grades for each assignment and calculate overall grade

• Manage assignments and deadlines with notifications for students

• Enable communication between teachers, students, and parents through messaging system
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Round duration - 70 Minutes
Round difficulty - Medium

This round had 40 MCQ's followed by 2 questions of DS and Algo. The programming questions were preety standard and can be solved within 30 minutes.

Q1. 
Count Inversions Problem Statement
Given an integer array ARR of size N, your task is to find the total number of inversions that exist in the array.
An inversion is defined for a pair of integers in the...read more
Ans. 
Count the total number of inversions in an integer array.
• Iterate through the array and for each pair of elements, check if the conditions for inversion are met.

• Use a nested loop to compare each pair of elements efficiently.

• Keep a count of the inversions found and return the total count at the end.
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Q2. 
Subarray With Given Sum Problem Statement
Given an array ARR of N integers and an integer S, determine if there exists a contiguous subarray within the array with a sum equal to S. If such a subarray exis...read more
Ans. 
Given an array of integers, find a subarray with a given sum S.
• Use a sliding window approach to find the subarray with the given sum.

• Keep track of the current sum and adjust the window based on the sum.

• Return the start and end indices of the subarray if found, else return [-1, -1].
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Round duration - 60 Minutes
Round difficulty - Easy

This round had 1 question from Linked List in which I had to first explain my approach and then code the solution. This was followed by some questions from OOPS , C++ and OS.

Q1. 
Middle of a Linked List
You are given the head node of a singly linked list. Your task is to return a pointer pointing to the middle of the linked list.
If there is an odd number of elements, return the ...read more
Ans. 
Return the middle element of a singly linked list, or the one farther from the head node in case of even number of elements.
• Traverse the linked list with two pointers, one moving twice as fast as the other

• When the fast pointer reaches the end, the slow pointer will be at the middle

• Return the element pointed to by the slow pointer
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Q2. What do you mean by virtual functions in C++?
Ans. 
Virtual functions in C++ allow a function to be overridden in a derived class, enabling polymorphic behavior.
• Virtual functions are declared in a base class with the 'virtual' keyword.

• They are overridden in derived classes to provide specific implementations.

• They enable polymorphism, allowing objects of different derived classes to be treated as objects of the base class.

• Example: class Animal { virtual void makeSound() ...read more
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Q3. Can you explain the concepts of method overloading and method overriding in object-oriented programming?
Ans. 
Method overloading is having multiple methods in the same class with the same name but different parameters. Method overriding is redefining a method in a subclass with the same signature as in the superclass.
• Method overloading allows multiple methods with the same name but different parameters in the same class.

• Method overriding involves redefining a method in a subclass with the same signature as in the superclass.

• Me...read more
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Q4. Can you explain the difference between static and dynamic linking in operating systems?
Ans. 
Static linking includes all library modules in the executable file, while dynamic linking loads libraries at runtime.
• Static linking includes all library modules in the executable file, increasing its size.

• Dynamic linking loads libraries at runtime, reducing the size of the executable file.

• Static linking results in faster startup time, while dynamic linking allows for easier updates to libraries.

• Examples of static linki...read more
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Q5. What is a linker error in C++?
Ans. 
A linker error in C++ occurs when the linker is unable to resolve references to functions or variables during the linking phase of compilation.
• Linker errors occur when there are missing definitions for functions or variables that are referenced in the code.

• Common causes of linker errors include forgetting to define a function that is declared, or not including the necessary library or object files.

• Example: If a functio...read more
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Q6. What is the difference between inline functions and macros in C++?
Ans. 
Inline functions are actual functions while macros are preprocessor directives in C++.
• Inline functions are actual functions defined with the 'inline' keyword, while macros are preprocessor directives that are replaced before compilation.

• Inline functions provide type checking and scope resolution, while macros do not.

• Inline functions can have multiple lines of code and can access variables in the scope they are called f...read more
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Round duration - 30 Minutes
Round difficulty - Easy

This is a cultural fitment testing round. HR was very frank and asked standard questions. Then we discussed about my role.

Q1. What is something about you that is not included in your resume?
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Q2. Why should we hire you?
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Round duration - 50 Minutes
Round difficulty - Easy

OOPs concept

Round duration - 80 Minutes
Round difficulty - Medium

OOPs concept.

Polymorphism and its types.

Compile-time polymorphism

Write a code to show operator overloading.

Difference between method overloading and method overriding.

Threading, multilevel scheduling, and its drawbacks and how it can be overcome.

DBMS -sql queries, same data but write using IN instead of WHERE
 

Q1. 
Remove Occurrences of Character from String
Given a string str and a character X, write a function to remove all occurrences of X from the string.
If the character X does not exist in the input string, t...read more
Ans. 
Create a function to remove all occurrences of a given character from a string.
• Iterate through the string and build a new string excluding the specified character.

• Use string manipulation functions to achieve the desired result.

• Handle the case where the character does not exist in the string.

• Return the modified string as the output.
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Q2. 
Subarray With Given Sum Problem Statement
Given an array ARR of N integers and an integer S, determine if there exists a contiguous subarray within the array with a sum equal to S. If such a subarray exis...read more
Ans. 
Given an array of integers, find a contiguous subarray with a given sum.
• Iterate through the array while keeping track of the current sum and start index.

• Use a hashmap to store the sum and its corresponding index.

• If the current sum - target sum exists in the hashmap, return the indices.

• Handle edge cases like when the target sum is 0 or when no subarray is found.
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Q3. 
Character Frequency Problem Statement
You are given a string 'S' of length 'N'. Your task is to find the frequency of each character from 'a' to 'z' in the string.
Example:
Input:
S : abcdg
Output:
1...read more
Ans. 
The task is to find the frequency of each character from 'a' to 'z' in a given string.
• Create an array of size 26 to store the frequency of each character from 'a' to 'z'.

• Iterate through the given string and increment the count of each character in the array.

• Print the array of frequencies as the output for each test case.
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Q4. 
Find the Duplicate Number Problem Statement
Given an integer array 'ARR' of size 'N' containing numbers from 0 to (N - 2). Each number appears at least once, and there is one number that appears twice. Yo...read more
Ans. 
Find the duplicate number in an array of integers from 0 to N-2.
• Iterate through the array and keep track of the frequency of each number using a hashmap.

• Return the number with a frequency greater than 1 as the duplicate number.

• Alternatively, use Floyd's Tortoise and Hare algorithm to find the duplicate number in O(N) time and O(1) space.
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Q5. 
Remove Character from String Problem Statement
Given a string str and a character 'X', develop a function to eliminate all instances of 'X' from str and return the resulting string.
Input:
The first lin...read more
Ans. 
Develop a function to remove all instances of a given character from a string.
• Iterate through the string and only add characters that are not equal to the given character to a new string.

• Return the new string as the result.

• Handle edge cases like empty string or character not found in the string.

• Example: Input 'hello world' and 'o', output 'hell wrld'.
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Round duration - 70 Minutes
Round difficulty - Medium

This round had 40 MCQ's followed by 2 questions of DS and Algo. The programming questions were preety standard and can be solved within 30 minutes.

Q1. 
Maximum Subarray Sum Problem Statement
Given an array arr of length N consisting of integers, find the sum of the subarray (including empty subarray) with the maximum sum among all subarrays.
Explanation...read more
Ans. 
Find the sum of the subarray with the maximum sum among all subarrays in a given array.
• Iterate through the array and keep track of the maximum sum subarray seen so far.

• Use Kadane's algorithm to efficiently find the maximum subarray sum.

• Handle cases where all elements are negative or array is empty.

• Example: For input arr = [-2, 1, -3, 4, -1], the maximum subarray sum is 4.
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Q2. 
Remove Character from String Problem Statement
Given a string str and a character 'X', develop a function to eliminate all instances of 'X' from str and return the resulting string.
Input:
The first lin...read more
Ans. 
Develop a function to remove all instances of a given character from a string.
• Iterate through the string character by character and only add characters that are not equal to the given character to a new string.

• Alternatively, use built-in string manipulation functions to remove all instances of the given character from the string.

• Ensure the function handles edge cases such as empty strings or strings with no instances o...read more
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Round duration - 60 Minutes
Round difficulty - Medium

This round had questions from DSA, OS, DBMS and Computer Networks. The programming question was quiet easy and I coded it preety fast after discussing the appropriate approach and complexity analysis.

Q1. 
Intersection of Linked List Problem
You are provided with two singly linked lists containing integers, where both lists converge at some node belonging to a third linked list.
Your task is to determine t...read more
Ans. 
Find the node where two linked lists merge, return -1 if no merging occurs.
• Traverse both lists to find their lengths and the difference in lengths

• Move the pointer of the longer list by the difference in lengths

• Traverse both lists simultaneously until they meet at the merging point
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Q2. Can you explain the concepts of multitasking and multiprogramming?
Ans. 
Multitasking involves executing multiple tasks simultaneously, while multiprogramming involves running multiple programs on a single processor.
• Multitasking allows multiple tasks to run concurrently on a single processor, switching between them quickly.

• Multiprogramming involves loading multiple programs into memory and executing them concurrently, utilizing idle CPU time efficiently.

• Examples of multitasking include runn...read more
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Q3. What is the difference between a process and a program?
Ans. 
A process is an executing instance of a program, while a program is a set of instructions stored in the computer's memory.
• A program is a static set of instructions stored on disk, while a process is a dynamic instance of those instructions being executed in memory.

• Multiple processes can be running the same program simultaneously, each with its own memory space and resources.

• Processes have their own unique process ID (P...read more
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Q4. What is the difference between a process and a thread?
Ans. 
A process is an instance of a program, while a thread is a unit of execution within a process.
• A process has its own memory space, while threads share the same memory space.

• Processes are independent and isolated, while threads can communicate and share resources.

• Creating a new process is more resource-intensive than creating a new thread.

• Processes have their own program counter, while threads share the same program coun...read more
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Q5. What is the main difference between UNION and UNION ALL?
Ans. 
UNION combines and removes duplicate rows, UNION ALL combines without removing duplicates.
• UNION combines the result sets of two or more SELECT statements into a single result set

• UNION removes duplicate rows from the result set

• UNION ALL combines the result sets without removing duplicates

• UNION is slower than UNION ALL as it requires additional processing to remove duplicates

• Use UNION when you want to combine and remove ...read more
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Q6. What are the advantages of using views in a database management system?
Ans. 
Views provide a virtual representation of data, offering advantages such as simplifying complex queries, enhancing security, and improving performance.
• Views simplify complex queries by predefining commonly used joins, filters, and aggregations.

• Views enhance security by allowing users to access only specific columns or rows of a table.

• Views improve performance by storing the results of complex queries, reducing the need...read more
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Q7. What is the ARP protocol?
Ans. 
ARP stands for Address Resolution Protocol, used to map IP addresses to MAC addresses in a local network.
• ARP is used to find the MAC address of a device based on its IP address

• It operates at the data link layer of the OSI model

• ARP requests are broadcasted to all devices on the local network

• Example: When a device wants to communicate with another device on the same network, it uses ARP to find the MAC address of the des
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Round duration - 30 Minutes
Round difficulty - Easy

This is a cultural fitment testing round. HR was very frank and asked standard questions. Then we discussed about my role.

Q1. Why should we hire you?
Ans. 
I should be hired because of my strong technical skills, problem-solving abilities, and passion for software development.
• I have a solid understanding of data structures and algorithms.

• I have experience in developing and debugging complex software systems.

• I am a quick learner and can adapt to new technologies and programming languages.

• I have a track record of delivering high-quality code on time.

• I am a team player and c...read more
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Q2. What is something about you that is not included in your resume?
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