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Java is a versatile, object-oriented programming language used for building cross-platform applications.
Object-Oriented: Java uses classes and objects to model real-world entities. Example: Creating a 'Car' class with attributes like 'color' and 'model'.
Platform-Independent: Java applications can run on any device with a Java Virtual Machine (JVM). Example: Write once, run anywhere.
Rich API: Java provides a compre...
OOP (Object-Oriented Programming) is a programming paradigm based on objects and classes to structure software design.
Encapsulation: Bundling data and methods that operate on the data within one unit (e.g., a class).
Inheritance: Mechanism to create a new class using properties and methods of an existing class (e.g., a 'Dog' class inheriting from an 'Animal' class).
Polymorphism: Ability to present the same interfac...
Design a data structure for O(1) create/delete and random number generation using a hash map and an array.
Use a hash map to store elements with their indices for O(1) access.
Maintain an array to store the actual elements for O(1) random access.
On insertion, add the element to the array and update the hash map.
On deletion, swap the element with the last element in the array, remove it, and update the hash map.
To ge...
URL stands for Uniform Resource Locator, a reference to a web resource that specifies its location on a computer network.
A URL is used to access web pages, such as 'https://www.example.com'.
It consists of several components: protocol (http), domain (example.com), and path (/page).
URLs can also include query parameters, like 'https://www.example.com/search?q=keyword'.
They are essential for web navigation and linkin...
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PHP is a popular server-side scripting language designed for web development, enabling dynamic content creation and database interaction.
PHP stands for 'Hypertext Preprocessor'.
It is widely used for building web applications, such as WordPress and Facebook.
PHP code is embedded within HTML, allowing for seamless integration.
It supports various databases, including MySQL, PostgreSQL, and SQLite.
PHP is open-source an...
MySQL is an open-source relational database management system used for storing and managing data.
MySQL uses Structured Query Language (SQL) for database operations.
It supports various data types, including INT, VARCHAR, and DATE.
MySQL is widely used in web applications, such as WordPress and Joomla.
It allows for data manipulation through commands like SELECT, INSERT, UPDATE, and DELETE.
MySQL can handle large datab...
Java is a versatile, object-oriented programming language used for building platform-independent applications.
Developed by Sun Microsystems in 1995.
Java runs on the Java Virtual Machine (JVM), enabling cross-platform compatibility.
It supports Object-Oriented Programming (OOP) principles like inheritance, encapsulation, and polymorphism.
Java is widely used for web applications, mobile applications (Android), and en...
CSS (Cascading Style Sheets) is a stylesheet language used to describe the presentation of a document written in HTML or XML.
CSS controls layout, colors, fonts, and overall visual appearance of web pages.
It allows for responsive design, enabling websites to adapt to different screen sizes (e.g., using media queries).
CSS can be applied inline, embedded in the head of an HTML document, or linked as an external style...
HTML (HyperText Markup Language) is the standard language for creating web pages and web applications.
HTML uses tags to structure content, e.g., <h1> for headings, <p> for paragraphs.
It allows embedding multimedia elements like images (<img>) and videos (<video>).
HTML forms (<form>) enable user input, such as text fields and buttons.
HTML documents are structured with a doctype declara...
Check if two strings are equal after processing backspaces represented by '#'.
Use two pointers to traverse both strings from the end to the beginning.
Skip characters when encountering a '#', which represents a backspace.
Compare characters from both strings after processing backspaces.
Example: s = 'ab#c', t = 'ad#c' -> both result in 'ac', so return true.
Example: s = 'a##c', t = '#a#c' -> both result in 'c', ...
I appeared for an interview in Feb 2025.
Coding questions about our technical skills
I applied via Company Website and was interviewed in Nov 2024. There was 1 interview round.
Amazon offers challenging projects, innovative technologies, and a collaborative work environment.
Opportunity to work on cutting-edge projects like Amazon Web Services (AWS) or Alexa
Access to vast resources and tools for development
Collaborative work culture that encourages learning and growth
Opportunity to impact millions of customers worldwide
Competitive compensation and benefits package
I applied via Company Website and was interviewed in Jun 2024. There were 6 interview rounds.
It was a coding test on Hackerrank with 3 Leetcode easy to medium-level questions.
I applied via Campus Placement and was interviewed in Nov 2024. There were 3 interview rounds.
Good but tough i dint do well but still qualified
Very tough only graphs dp and linked lists were asked
Depth-first search (DFS) is a graph traversal algorithm that explores as far as possible along each branch before backtracking.
DFS starts at a selected node and explores as far as possible along each branch before backtracking.
It uses a stack to keep track of nodes to visit next.
DFS can be implemented recursively or iteratively.
Example: DFS traversal of a graph starting from node A: A -> B -> D -> E -> C -&...
I appeared for an interview in Jun 2025, where I was asked the following questions.
Hacker rank test include 2 code and mcg questions
Two coding questions, both passed 100%
Identifying duplicates in an array involves finding and removing elements that appear more than once.
Iterate through the array and use a hash set to keep track of elements seen so far.
If an element is already in the hash set, it is a duplicate and can be removed.
Example: ['apple', 'banana', 'apple', 'orange'] - 'apple' is a duplicate.
Example: ['cat', 'dog', 'bird', 'cat'] - 'cat' is a duplicate.
2-3 coding questions with some mcq
I appeared for an interview in Apr 2025, where I was asked the following questions.
Design a data structure for O(1) create/delete and random number generation using a hash map and an array.
Use a hash map to store elements with their indices for O(1) access.
Maintain an array to store the actual elements for O(1) random access.
On insertion, add the element to the array and update the hash map.
On deletion, swap the element with the last element in the array, remove it, and update the hash map.
To get a r...
Some of the top questions asked at the Amazon Software Developer interview -
The duration of Amazon Software Developer interview process can vary, but typically it takes about less than 2 weeks to complete.
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