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Razorpay Intern Interview Questions and Answers
Razorpay Intern Interview Experiences
1 interview found
Anonymous
2 hours HackerEarth coding round
(1 Question)
- Q1. Some medium level of question
HackerEarth test medium level question
Interview Preparation Tips
Interview questions from similar companies
I appeared for an interview in Jun 2017.
Interview Questionnaire
11 Questions
- Q1. How does ajax call work
- Ans.
Ajax calls allow for asynchronous communication between client and server without reloading the page.
Ajax stands for Asynchronous JavaScript and XML
Uses XMLHttpRequest object to send and receive data
Allows for partial page updates without reloading the entire page
Can handle data in various formats such as JSON, XML, HTML, and plain text
Example: $.ajax({url: 'example.com', success: function(data){console.log(data)}});
- Q2. Difference between REST and SOAP
- Ans.
REST is lightweight and uses HTTP while SOAP is XML-based and has more features.
REST uses HTTP methods like GET, POST, PUT, DELETE while SOAP uses XML messaging.
REST is stateless while SOAP can maintain state.
REST is faster and easier to use while SOAP is more secure and reliable.
REST is used for web services while SOAP is used for enterprise-level services.
Example of REST: Twitter API. Example of SOAP: Amazon Web Serv
- Q3. What is GET and POST
- Ans.
GET and POST are HTTP methods used for sending data to a server.
GET is used to retrieve data from a server
POST is used to submit data to a server
GET requests can be cached and bookmarked
POST requests are not cached and cannot be bookmarked
GET requests have length restrictions
POST requests have no length restrictions
GET requests are less secure than POST requests
- Q4. What is observer pattern
- Ans.
Observer pattern is a design pattern in which an object maintains a list of its dependents and notifies them automatically of any state changes.
Also known as publish-subscribe pattern
Used in event-driven systems
Allows loose coupling between objects
Example: A weather station broadcasts weather updates to multiple displays
Example: A stock market ticker notifies multiple investors of stock price changes
- Q5. What is singleton
- Ans.
Singleton is a design pattern that restricts the instantiation of a class to a single object.
Singleton ensures that only one instance of a class exists in the entire application.
It provides a global point of access to the instance.
Commonly used in scenarios where a single instance needs to coordinate actions across the system.
Example: Database connection manager, logger, configuration manager.
- Q6. What is immutable in java
- Ans.
Immutable in Java refers to objects whose state cannot be changed after creation.
String, Integer, and other wrapper classes are immutable in Java.
Immutable objects are thread-safe and can be shared without synchronization.
To create an immutable class, make all fields final and private, and don't provide setters.
Examples of immutable classes in Java include LocalDate, LocalTime, and LocalDateTime.
- Q7. How do you create immutable in java
- Ans.
Creating immutable in Java
Use final keyword to make variables immutable
Use private constructor to prevent object modification
Use defensive copying to prevent modification of mutable objects
Use enum to create immutable objects
Use String class to create immutable strings
- Q8. Where have you used immutable in java
- Q9. What is dependency injection
- Ans.
Dependency injection is a design pattern that allows objects to receive dependencies rather than creating them internally.
It helps to decouple the code and makes it more testable and maintainable.
It allows for easier swapping of dependencies without changing the code.
There are three types of dependency injection: constructor injection, setter injection, and interface injection.
Example: Instead of creating a database co...
- Q10. What is CORS
- Ans.
CORS stands for Cross-Origin Resource Sharing. It is a security feature implemented in web browsers to restrict access to resources from different origins.
CORS allows web servers to specify which origins are allowed to access its resources
It is implemented using HTTP headers
CORS prevents malicious websites from accessing sensitive data from other websites
Examples of resources that may be restricted by CORS include cook
- Q11. How do you overcome CORS
- Ans.
CORS can be overcome by configuring the server to allow cross-origin requests.
Configure the server to include the Access-Control-Allow-Origin header
Use JSONP (JSON with Padding) to bypass CORS restrictions
Use a proxy server to make the request on behalf of the client
Use a browser extension to disable CORS restrictions during development
Use a server-side proxy to forward requests to the target server
Interview Preparation Tips
Skills evaluated in this interview
Interview Questionnaire
7 Questions
- Q1. Discussion on my internships and course projects.
- Q2. My field of interest, how well have I fared in it.
- Q3. Design a mvc controller system where given a url, I am able to invoke the right controller. Eg, given "xyz.com/a/b/c", I should be able to invoke c controller by going through a and b
- Q4. Design autocomplete in IDEs
- Ans.
Autocomplete in IDEs helps developers write code faster by suggesting code snippets and completing code as they type.
Autocomplete should suggest code snippets based on the context of the code being written
Autocomplete should prioritize suggestions based on frequency of use
Autocomplete should also suggest variable and function names
Autocomplete should be customizable to allow for user-defined snippets and suggestions
Exa...
- Q5. What is my weakness
- Ans.
My weakness is public speaking.
I tend to get nervous when speaking in front of large groups.
I am working on improving my public speaking skills by practicing and seeking feedback.
I have taken courses and attended workshops to help me overcome my fear of public speaking.
- Q6. Given 2 game scenarios for basketball, and given p as the probability of making a basket in an attempt, I have to understand the condition where game1 would be preferable over game2. In first game, I have ...
- Ans.
Comparing 2 basketball game scenarios with different number of trials and baskets required to win
Calculate the probability of winning in each game scenario using binomial distribution formula
Compare the probabilities to determine which game scenario is preferable
In game1, the probability of winning is p. In game2, the probability of winning is the sum of probabilities of making 2 or 3 baskets
If p is high, game1 is pref...
- Q7. Given a dictionary of words, I have to go from one word to another in least number of transitions where a transition is a defined as changing any letter of the current word such that the new word is also i...
Interview Preparation Tips
Experience: The test was on hackerrank.
Tips: * Fast coding and problem solving required
* Time crunch
* The test is valued a LOT in the hiring process
Duration: 120 minutes
Total Questions: 4
Round: Technical Interview
Experience: Question 1 : He tried to take the discussion to web based technologies to which I straightly told I don’t know. Not sure if that was a good decision. Nevertheless, he went over my resume a lot of times and asked about various projects.
Question 2 : Discussed the various projects related to it.
Question 3 : He asked this question because I had worked on django during my FB internship. I proposed a tree based structure. xyz.com/a/b/c ---> b is child of a, c is child of b.
Question 4 : Next he moved to a very interesting question. Given a simple text editor, I want to facilitate autocomplete feature. We discussed about syntactic methods using language specific keywords. I suggested a trie based implementation which he liked. Later he asked me to improve and redirected me to using scope of the variables, and grammar of the language. We discussed about all the steps I did in language translators lab (macrojava -> minijava -> typechecking -> miniIR -> microIR -> miniRA ->Mips) where we built a Java compiler in Java. We later hopped back to original question and I suggested that we can use grammar to to store multiple (nested kind of) tries for different scope. He asked me how would I define “scope”. He gave me a scenario which helped me come up with the nested trie structure
int a;
{
int b;
{
int c; //a b c can be used
}
{
int d; //a b d can be used
}
}
He then asked me details of how I would code. I said we could use the respective visitors and maintain the current trie root for scope. He liked it but I missed at 2 places :
1. He asked me about token generation used in a compiler and I said flex and bison. I was expected to elaborate a bit.
2. He asked me how the grammar is generated and how the visitors are invoked. I couldn’t explain properly because I was not thorough with it.
Tips: * Keep smiling in the interviews.
* My interviewer had hopped from Microsoft to Visa. We had a short detailed discussion on how the transition was and what drove him to do that.
* It’s always good to know about the company to pick up interesting discussions, read up latest articles and news
* The interviewers want to see if you are passionate about what they are building. Their PPT (Pre Placement Talk) was also focussed majorly on the technologies they are building.
* If you take a question in a direction, make sure you are very very thorough with it. I took it in the direction of compilers, but couldn't make the transition seamlessly because I wasn't thorough with a lot of things (like token generation, visitor invocation).
* Not sure if telling upfront that you don't know about web technologies when you are applying for a profile that might need it is a good idea or not.
Round: Technical Interview
Experience: I think he was a senior person and spoke very passionately about the work that is happening in visa Bangalore office.
Question 1 : I said maybe I should have learnt a little about web based technologies. I think he was looking for a more generic answer.
Question 2 : I went ahead with calculating the expected score where my score random variable = 1 with probability p, and 0 with probability (1-p). I conditioned that expected score of game1 > game2 which would give me the range of p. I goofed up the equations twice but he said he liked my approach and I was just there
Question 3 : I suggested building a graph where a node is a word and an edge means a transition, and then performing BFS. He said that was obvious and that he was more interested in knowing how I build the graph. I suggested a method to reduce the number of string comparisons by storing a count vector with each word. Count vector is a 26 length vector where count[i] = number of times that letter occurs in the word. I would do string comparison to identify neighbours only if the difference in count vectors in 2. Eg, cot = cat - a + o. String comparison is still needed because of false positives. Eg, oct = cat - a + o but cat -> oct is not a valid transition. He liked my approach and asked me to code, discussed the complexity.
Tips: * Don't be naive around a senior engineer. Be confident.
* Explain your approach before going ahead solving it. I missed that in Q1 and for a long time he didn't know what I was heading towards.
* Write clean code, practice coding on paper to make sure you write compilable code. Shabby code is a turn off.
* Show passion for the company you are applying for.
General Tips: * Be friendly and keep smiling.
* Know about the company, well in detail. Recent news, articles, acquisitions, organisational changes, new offices, new product, etc.
* Know about the volume the company handles, certain mind boggling figures, what the company *does not* do
* If you are introducing yourself as an expert in a certain field, be prepared for questions like "How will you contribute to our company with your expertise" type of questions.
* Be very very thorough with every single thing you write on your resume. A small point you weren't sure about might become the basis of your whole interview. Don't write things you are unsure of, or have worked very little on.
Skill Tips: * I think I didn’t take Visa very seriously. I was assuming they won’t take a undergrad and they won’t take me because I have 0 knowledge in web based technologies. I might have acted a little cocky.
* They had nice pie diagrams which shows that they had done thorough research about each and every candidate based on resume and the coding test.
* They value the coding test a lot.
* Be very thorough with the projects you write on resume. They will give you a problem which won't be straightforward and will map onto one of your course projects. You are expected to do the mapping seamlessly. Every bit of the discussion you have with the interviewer can be your next problem.
* Brush up on web based technologies if you can.
* There will be a HR round as well if you clear the technical interviews.
Skills: Maths(esp Probability), Design, Passion, Web Technologies, Technical Skill And Speaking Skill, Coding Skills
College Name: IIT Madras
Motivation: * Been the leader since more than half a century, been through the technological revolution.
* Revolutionising payments architecture. Building something of greatest need, so elegant and optimised, yet producing such consistent performance.
* Keeping up with the need of the generation by introducing features which are brand new. Eg, “all-purpose credit card”.
* Loved their PPT (Pre Placement Talk). Volume of the data and processing is IMMENSE. Billions of transactions in a year voluming up to trillions. More than 200 countries in the world --> these stats are HUGE.
* Fraud detection is a space I would have loved to work on given that I come from a Data Mining background.
Funny Moments: Chucked out before HR round :P
Skills evaluated in this interview
Soumya Patro
Interview Questionnaire
2 Questions
- Q1. Why would you like to join Visa and why?
- Q2. Tell me about yourself
Interview Preparation Tips
Experience: Coding Questions were fairly standard ones.
Duration: 75 minutes
Total Questions: 42
Round: Interview
Experience: Networks based questions, firewalls, TCP/IP and other OSI layers
Round: Interview
Experience: Coding questions. Asked to code on paper. Questions on Object Oriented Design.
Skills: Networks basics, OOPs basics, Coding Skills
College Name: IIT Guwahati
Motivation: Profiles offered, Package, Location
Interview Preparation Tips
Experience: Questions on
1. Programming: 10 Questions2. Machine Learning Hadoop MCQ: 6 Questions3. Networking MCQ: 6 Questions4. Operating System: 6 Questions5. Infrastructure: 6 Questions6. Application Security: 6 Questions
Tips: Questions were simple , except sections 2,5 unless you have a basic idea about it.
Duration: 75 minutes
Total Questions: 34+2
Round: Technical Interview
Experience: – Projects, Internship– Asymmetric and Symmetric encryption with some real world usage– Concepts behind Digital Signature and Digital Certificates– Detailed discussion on HTTPS– Basic OS concepts : Threads, Mutex , Semaphores– Basic OOPS concepts : Virtual functions , Function overloading and overriding , encapsulation.
Tips: Focus on Network Security concepts !
Round: Technical Interview
Experience: – Projects , Internship– Some discussion on Testing and how you would design a unit test case and a complete project test case. Discussion on Automated Testing.– How does a Web application work.– Software Development Models– Discussion on interpreted language and compiled language– Some DBMS basics for efficiency :- Indexing viz. B+trees , Hashing.– Some discussion on Apple Pay , VbV (Verified by Visa) (informal)
Round: HR Interview
Experience: Basic HR questions !
General Tips: Confidence is the key along with sufficient coding practice both on the IDE and pen-paper.
Skills: Network Security, Programming, Algorithms, Operating System
College Name: IIT ROORKEE
I applied via Campus Placement and was interviewed in Dec 2016. There were 5 interview rounds.
Interview Questionnaire
7 Questions
- Q1. Given an array, Implement Binary search tree
- Ans.
Implement Binary Search Tree using given array of strings.
Sort the array in ascending order
Find the middle element and make it the root of the tree
Recursively create left and right subtrees using the left and right halves of the array
Repeat until all elements are added to the tree
- Q2. Given the above Binary search tree, print in ascending order
- Ans.
Print the given Binary search tree in ascending order
Traverse the left subtree recursively
Print the root node
Traverse the right subtree recursively
- Q3. Given an array of stock prices, find where to buy and where to sell for maximum profit in O(n)
- Ans.
Find buy and sell points for maximum profit in an array of stock prices in O(n)
Iterate through the array and keep track of the minimum price seen so far
Calculate the profit at each index by subtracting the minimum price from the current price
Update the maximum profit and buy/sell points accordingly
Return the buy and sell points for maximum profit
- Q4. Resume based
- Q5. What are three problems Chennai faces?
- Ans.
Chennai faces problems related to water scarcity, traffic congestion, and pollution.
Water scarcity due to inadequate rainfall and poor management of water resources.
Traffic congestion due to the increasing number of vehicles and poor road infrastructure.
Pollution caused by industries, vehicular emissions, and improper waste disposal.
- Q6. Which one would you solve and how and why?
- Ans.
Need more context on the question to provide an answer.
Please provide more information on the problem to be solved.
Without context, it is difficult to provide a solution.
Can you please provide more details on the problem statement?
- Q7. What is most interesting thing about Visa?
- Ans.
Visa is a global payments technology company that connects consumers, businesses, banks and governments in more than 200 countries and territories.
Visa operates the world's largest retail electronic payments network.
VisaNet, the company's global processing system, handles more than 65,000 transaction messages a second.
Visa is constantly innovating to improve payment security and convenience, with initiatives such as Vi...
Interview Preparation Tips
Experience: 4 Coding questions on Hackerrank platform, one and half hour time. I am not going to reveal the questions here, but one was a basic binary tree implementation and the other three were algorithmic and mathematical problems. They were kinda hard to solve in an hour and half. I could do only 1 and half of the other one. I got 115/300 points on that. I was one of the 16 people selected for the interview.
Tips: It all depends on how well you can focus on the test day. Just practice a lot on hackerrank.
Duration: 1 hour 30 minutes
Total Questions: 4
Round: Technical Interview
Experience: The first two questions I was able to do fast enough. I was also asked a few questions on my resume and coding-related internship. The last one, I showed an O(n*n) algorithm first and then modified it to O(n). Around 45 minutes.
Tips: Be thorough on the coding part in your resume. Think out aloud!
Round: Technical + HR Interview
Experience: Just a few normal questions regarding my projects and my favorite course and it's application to Visa. 15 minutes.
Tips: Once again, be thorough on your resume.
Round: HR Interview
Experience: Once again a normal round, just random questions as to whether I am interested and good enough in communication. 15 minutes.
Tips: Don't get shaken. Be ready for all kinds of questions. Especially about Visa relation to what you do
Skills: Smart Coding
College Name: IIT Madras
Skills evaluated in this interview
I appeared for an interview before Apr 2021.
(4 Questions)
Round duration - 45 minutes
Round difficulty - Easy
This was a technical interview round.
- Q1. How does AJAX work?
- Ans.
AJAX allows web pages to be updated asynchronously by exchanging data with a web server behind the scenes.
AJAX stands for Asynchronous JavaScript and XML.
It allows web pages to update content without reloading the entire page.
AJAX uses XMLHttpRequest object to send and receive data from a server.
Commonly used in web applications to provide a more responsive user experience.
- Q2. What is the difference between SOAP and REST?
- Ans.
SOAP is a protocol, while REST is an architectural style for web services.
SOAP is a protocol that uses XML for message format and relies on a request-response model.
REST is an architectural style that uses standard HTTP methods like GET, POST, PUT, DELETE.
SOAP is more rigid and requires more bandwidth, while REST is lightweight and flexible.
SOAP has built-in security features like WS-Security, while REST relies on exte...
- Q3. What is the difference between GET and POST methods in APIs?
- Ans.
GET is used to request data from a server, while POST is used to submit data to a server.
GET requests data from a specified resource, while POST submits data to be processed to a specified resource.
GET requests are cached by browsers, while POST requests are not.
GET requests can be bookmarked and shared, while POST requests cannot.
GET requests have length restrictions, while POST requests do not.
Example: Using GET to r...
- Q4. What is the Observer Pattern?
- Ans.
The Observer Pattern is a behavioral design pattern where an object (subject) maintains a list of dependents (observers) that are notified of any state changes.
Allows for one-to-many dependency between objects
When the subject's state changes, all observers are automatically notified and updated
Commonly used in event handling systems and GUI frameworks
(4 Questions)
Round duration - 40 minutes
Round difficulty - Easy
This was the second technical interview round.
- Q1. What is a singleton class?
- Ans.
A singleton class is a class that can only have one instance created throughout the entire application.
Singleton classes have a private constructor to prevent multiple instances from being created.
They typically provide a static method to access the single instance.
Commonly used for logging, database connections, and configuration settings.
- Q2. What is meant by immutability in Java?
- Ans.
Immutability in Java refers to the property of objects whose state cannot be changed once they are created.
Immutability ensures that once an object is created, its state cannot be modified.
Immutable objects are thread-safe and can be shared without the risk of data corruption.
String class in Java is an example of an immutable class.
To create an immutable class, make the class final, all fields private, and provide only
- Q3. What is dependency injection?
- Ans.
Dependency injection is a design pattern where components are given their dependencies rather than creating them internally.
Allows for easier testing by providing mock dependencies
Promotes loose coupling between components
Improves code reusability and maintainability
Examples: Constructor injection, Setter injection, Interface injection
- Q4. How do you create an immutable class in Java?
- Ans.
To create an immutable class in Java, make the class final, make all fields private and final, provide only getter methods, and do not provide any setter methods.
Make the class final to prevent inheritance.
Make all fields private and final to prevent modification.
Provide only getter methods to access the fields.
Do not provide any setter methods to modify the fields.
Round duration - 30 minutes
Round difficulty - Easy
HR round with typical behavioral problems.
Interview Preparation Tips
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
Skills evaluated in this interview
I appeared for an interview before Apr 2021.
(2 Questions)
Round duration - 60 minutes
Round difficulty - Easy
Technical Interview round with questions on DSA.
- Q1.
Stock Buy and Sell Problem Statement
You are given an array of integers
PRICESwherePRICES[i]represents the price of a stock on the i-th day, and an integerKrepresenting the number of transactions you... - Ans.
Determine maximum profit with at most K transactions by buying and selling stocks on given days.
Iterate through the array of prices while keeping track of the maximum profit achievable with at most K transactions.
Use dynamic programming to store the maximum profit at each day and transaction count.
Consider buying and selling stocks at each day to calculate the maximum profit.
Return the maximum profit achievable with at
- Q2.
Sorted Order Printing of a BST Array
Given a Binary Tree consisting of 'N' nodes with integer values, your task is to determine the in-order traversal of the Binary Tree.
Input:
The first line contains ... - Ans.
The task is to determine the in-order traversal of a Binary Tree given in level order.
Implement a function to perform in-order traversal of a Binary Tree
Use recursion to traverse left subtree, visit root, and then traverse right subtree
Handle null nodes denoted by -1 in the input
Round duration - 30 minutes
Round difficulty - Easy
HR round with typical behavioral problems.
Interview Preparation Tips
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
Skills evaluated in this interview
I appeared for an interview before Sep 2020.
(3 Questions)
Round duration - 70 minutes
Round difficulty - Medium
It consisted of three coding questions varying from easy to medium.
- Q1.
Distributing Coins in a Binary Tree
You are provided with the root of a binary tree that consists of 'N' nodes. Each node in this tree contains coins, and the total number of coins across all nodes is equ...
- Ans.
Determine the minimum number of moves required to distribute coins in a binary tree so that every node has exactly one coin.
Traverse the binary tree in a bottom-up manner to distribute coins efficiently.
Keep track of the excess or deficit of coins at each node to calculate the minimum moves required.
Transfer coins from nodes with excess coins to nodes with deficits to balance the distribution.
Example: For the input ROO...
- Q2.
Distinct Subsets Count
Given an array
arrof N integers that may include duplicates, determine the number of subsets of this array containing only distinct elements.The result should be returned modulo ...
- Ans.
Count the number of distinct-element subsets in an array modulo 10^9+7.
Iterate through the array and keep track of distinct elements using a set.
Calculate the number of subsets using the formula 2^distinct_count - 1.
Return the result modulo 10^9+7 for each test case.
- Q3.
0-1 Knapsack Problem Statement
A thief is robbing a store and can carry a maximal weight 'W' in his knapsack. There are 'N' items, where the i-th item has a weight 'wi' and value 'vi'. Consider the maximu...
- Ans.
The 0-1 Knapsack Problem involves maximizing the value of items a thief can steal within a weight limit.
Use dynamic programming to solve the problem efficiently.
Create a 2D array to store the maximum value that can be achieved at each weight limit.
Iterate through the items and weights to fill the array with optimal values.
Return the maximum value achievable at the given weight limit.
(2 Questions)
Round duration - 60 minutes
Round difficulty - Medium
The interview was focused on data structures as well as computer fundamentals along with puzzles.
- Q1.
Sort an Array in Wave Form
You are given an unsorted array
ARR. Your task is to sort it so that it forms a wave-like array.Input:
The first line contains an integer 'T', the number of test cases.
For ea... - Ans.
Sort an array in wave form where each element is greater than or equal to its adjacent elements.
Iterate through the array and swap adjacent elements to form a wave pattern.
Ensure that the first element is greater than or equal to the second element.
There can be multiple valid wave arrays, so any valid wave array is acceptable.
- Q2.
Reverse a Linked List Problem Statement
You are given a Singly Linked List of integers. Your task is to reverse the Linked List by changing the links between nodes.
Input:
The first line of input contai... - Ans.
Reverse a given singly linked list by changing the links between nodes.
Iterate through the linked list and reverse the links between nodes
Use three pointers to keep track of the current, previous, and next nodes
Update the links between nodes to reverse the list
Return the head of the reversed linked list
(3 Questions)
Round duration - 90 minutes
Round difficulty - Easy
The Round was mainly focused on resume+ dsa + system design +computer fundamentals
- Q1.
Running Median Problem
Given a stream of integers, calculate and print the median after each new integer is added to the stream.
Output only the integer part of the median.
Example:
Input:
N = 5
Stre... - Ans.
Calculate and print the median after each new integer is added to the stream.
Use a min heap to store the larger half of the numbers and a max heap to store the smaller half.
Keep the two heaps balanced by ensuring the size difference is at most 1.
If the total number of elements is odd, the median is the top of the larger heap. If even, average the tops of both heaps.
- Q2. Can you explain the implementation of an LRU (Least Recently Used) Cache in a database management system?
- Ans.
LRU cache in a database management system stores most recently used data and removes least recently used data when full.
LRU cache is implemented using a doubly linked list and a hash map.
Each node in the linked list represents a key-value pair.
When a key is accessed, it is moved to the front of the linked list.
If the cache is full, the least recently used node at the end of the list is removed.
Example: If cache size is...
- Q3. Design a stack that supports the getMin() operation in O(1) time and O(1) extra space.
- Ans.
Use two stacks - one to store actual values and one to store minimum values.
Use two stacks - one to store actual values and one to store minimum values
When pushing a new value, check if it is smaller than the current minimum and push it to the min stack if so
When popping a value, check if it is the current minimum and pop from min stack if so
getMin() operation can be done by peeking at the top of the min stack
Interview Preparation Tips
Tip 1 : Properly grasp over basic concepts
Tip 2 : Prepare good for DS & Algo as most companies have a separate round for it.
Tip 3 : Don't lie over your resume
Tip 1 : Don't Lie over your resume
Tip 2 : Avoid unnecessary details like Hobbies, family details, declaration, date, signature, etc.
Skills evaluated in this interview
Interview Questionnaire
2 Questions
- Q1. What is solid principles
- Ans.
SOLID principles are a set of five design principles for writing maintainable and scalable code.
S - Single Responsibility Principle
O - Open/Closed Principle
L - Liskov Substitution Principle
I - Interface Segregation Principle
D - Dependency Inversion Principle
- Q2. What are internal working of has set
- Ans.
HashSet is a collection that stores unique elements by using a hash table.
Elements are stored based on their hash code
Uses hashCode() and equals() methods to check for duplicates
Does not maintain insertion order
Allows null values
Example: HashSet
set = new HashSet<>(); set.add("apple"); set.add("banana");
Skills evaluated in this interview
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115
salaries
|  ₹2.4 L/yr - ₹5.5 L/yr |
|
Analyst
102
salaries
| ₹3.5 L/yr - ₹7.3 L/yr |
|
Software Engineer
95
salaries
| ₹8 L/yr - ₹26.5 L/yr |
|
Senior Associate
93
salaries
| ₹5.2 L/yr - ₹15 L/yr |
|
Senior Software Engineer
83
salaries
| ₹15 L/yr - ₹52 L/yr |
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