Ernst & Young Associate Software Engineer Interview Questions, Process, and Tips

Find the greatest element in the moving array

Q1. Interviewer Asked me to build Airline Management System
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Reasoning, maths and clocks based questions.

2 codings. DSA based.

Q1. What are OOPs Concepts?
Ans. 
OOPs Concepts are fundamental principles of Object-Oriented Programming that help in organizing and designing code.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (object).

• Inheritance: Allowing a class to inherit properties and behavior from another class.

• Polymorphism: Ability of objects to take on multiple forms or have multiple behaviors.

• Abstraction: Hiding the complex implementat...read more
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Q2. What is AVL tree?
Ans. 
AVL tree is a self-balancing binary search tree where the heights of the two child subtrees of any node differ by at most one.
• AVL tree was named after its inventors Adelson-Velsky and Landis.

• It is a type of binary search tree where the heights of the two child subtrees of any node differ by at most one.

• AVL trees are used to maintain a balanced tree structure, ensuring O(log n) time complexity for insertion, deletion, a...read more
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Q3. Define LIFO, FIFO etc
Ans. 
LIFO stands for Last In, First Out and FIFO stands for First In, First Out.
• LIFO: Last In, First Out - the last item added to a stack is the first one to be removed.

• FIFO: First In, First Out - the first item added to a queue is the first one to be removed.
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Q4. Share your college experienceon coding.
Ans. 
I gained hands-on coding experience through coursework, projects, and internships during my college years.
• Took courses in programming languages such as Java, C++, and Python.

• Participated in coding competitions and hackathons to enhance my skills.

• Completed coding projects in areas like web development, data analysis, and software engineering.

• Interned at a tech company where I worked on real-world coding projects.

• Collabo...read more
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Q1. Introduce yourself (3 mins)
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Q2. Area of Interests (3 mins)
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Basic conceptual knowledge check.

One basic and one intermediate level question you are allowed to give write the code in any language.

Q1. This is an AI based interview where on the screen flashes the question and you will have to answer them looking into the camera always camera will be on.
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Round duration - 60 Minutes
Round difficulty - Medium

This round had 2 coding questions where in I was first asked to explain my approach and then code the solution . After
that , I was asked some more questions on OOPS and JavaScript.

Q1. 
Intersection of Linked List Problem Statement
You are provided with two singly linked lists of integers. These lists merge at a node of a third linked list.
Your task is to determine the data of the node...read more
Ans. 
Given two linked lists, find the node where they intersect, if any.
• 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 in parallel until they meet at the intersection node
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Q2. 
Pythagorean Triplets Detection
Determine if an array contains a Pythagorean triplet by checking whether there are three integers x, y, and z such that x² + y² = z² within the array.
Input:
The first lin...read more
Ans. 
Detect if an array contains a Pythagorean triplet by checking if there are three integers x, y, and z such that x^2 + y^2 = z^2.
• Iterate through all possible combinations of three integers in the array and check if x^2 + y^2 = z^2.

• Use a nested loop to generate all possible combinations efficiently.

• Return 'yes' if a Pythagorean triplet is found, otherwise return 'no'.
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Q3. What do you mean by data encapsulation?
Ans. 
Data encapsulation is the concept of bundling data with the methods that operate on that data within a class.
• Data encapsulation helps in hiding the internal state of an object and restricting access to it.

• It allows for better control over the data by preventing direct access from outside the class.

• Encapsulation also helps in achieving data abstraction, where only relevant details are exposed to the user.

• For example, in...read more
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Q4. Can static methods be overridden?
Ans. 
No, static methods cannot be overridden in Java.
• Static methods belong to the class itself, not to instances of the class.

• Subclasses can define static methods with the same signature as the superclass, but it is not considered overriding.

• Example: Parent class has a static method 'display()', and child class also has a static method 'display()'. These are two separate methods, not overriding.
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Q5. What is the garbage collector in Java?
Ans. 
Garbage collector in Java is a built-in mechanism that automatically manages memory by reclaiming unused objects.
• Garbage collector runs in the background to identify and remove objects that are no longer needed.

• It helps prevent memory leaks and optimize memory usage.

• Examples of garbage collectors in Java include Serial, Parallel, CMS, and G1.
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Q6. Can you explain hoisting in JavaScript?
Ans. 
Hoisting in JavaScript is a behavior where variable and function declarations are moved to the top of their containing scope during the compilation phase.
• Variable declarations are hoisted to the top of their scope, but not their assignments.

• Function declarations are fully hoisted, meaning they can be called before they are declared.

• Hoisting can lead to unexpected behavior if not understood properly.
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Q7. What are closures in JavaScript?
Ans. 
Closures in JavaScript are functions that have access to variables from their outer scope even after the outer function has finished executing.
• Closures allow for maintaining state in JavaScript functions.

• They are created whenever a function is defined within another function.

• Closures can access variables from their outer scope, even after the outer function has returned.

• Example: function outerFunction() { let outerVar ...read more
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Round duration - 60 Minutes
Round difficulty - Medium

This round was mainly inclined towards some Frontend Web Development questions(as I had told the interviewer that I have some prior experince in that field and also have some projects supporting this) ranging from HTML,CSS to JavaScript.

Q1. Can you explain promises in JavaScript and describe its three states?
Ans. 
Promises in JavaScript represent the eventual completion or failure of an asynchronous operation.
• Promises are objects that represent the eventual completion or failure of an asynchronous operation.

• They have three states: pending, fulfilled, or rejected.

• A pending promise is one that is not yet settled, a fulfilled promise is one that has been resolved successfully, and a rejected promise is one that has encountered an e...read more
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Q2. What is a higher order function?
Ans. 
A higher order function is a function that can take other functions as arguments or return functions as results.
• Higher order functions can be used to create more flexible and reusable code.

• Examples include map, filter, and reduce functions in JavaScript.

• Higher order functions are commonly used in functional programming.
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Q3. 
Swap Two Numbers Problem Statement
Given two integers a and b, your task is to swap these numbers and output the swapped values.
Input:
The first line contains a single integer 't', representing the num...read more
Ans. 
Swap two numbers 'a' and 'b' and output the swapped values.
• Create a temporary variable to store one of the numbers before swapping

• Swap the values of 'a' and 'b' using the temporary variable

• Output the swapped values as 'b' followed by 'a'

• Example: If 'a' = 3 and 'b' = 4, after swapping 'a' will be 4 and 'b' will be 3
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Q4. What are the features of HTML5?
Ans. 
HTML5 is the latest version of the HTML standard with new features for web development.
• Support for multimedia elements like <video> and <audio>

• Canvas and SVG for graphics and animations

• Improved form controls and validation

• Offline storage capabilities with local storage and web storage

• Geolocation support for location-based services
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Q5. How can you optimize the loading of website assets?
Ans. 
Optimizing website asset loading involves minimizing file sizes, reducing server requests, utilizing caching, and prioritizing critical resources.
• Minimize file sizes by compressing images and scripts

• Reduce server requests by combining CSS and JS files, using sprites for images, and lazy loading non-essential resources

• Utilize browser caching to store static assets locally for faster loading times

• Prioritize critical reso...read more
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Q6. In how many ways can you display HTML elements?
Ans. 
There are multiple ways to display HTML elements, including inline, block, inline-block, and flex.
• Inline elements flow in a line with other elements and do not start on a new line. Example: <span>

• Block elements start on a new line and take up the full width available. Example: <div>

• Inline-block elements are similar to inline elements but can have block-level properties. Example: <img>

• Flex elements use...read more
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Round duration - 30 Minutes
Round difficulty - Easy

This was a typical HR round with some standard Behavioral questions like my interests, weaknesses, strengths, family
background, are you willing to relocate or travel , why Ernst & Young, CEO of Ernst & Young etc.

Q1. Why should we hire you?
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