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Find k closest points to origin from a set of 2D points.
Calculate distance of each point from origin using distance formula
Sort the points based on distance in ascending order
Return first k points from the sorted list
iOS manual memory management requires developers to manually allocate and deallocate memory for objects.
Developers must manually allocate memory for objects using methods like alloc and init.
Developers must also manually deallocate memory for objects using methods like release.
Failure to properly manage memory can lead to memory leaks and crashes.
ARC (Automatic Reference Counting) was introduced in iOS 5 to automate me...
Program to print powerset of a given set
Create an empty list to store subsets
Loop through all possible binary numbers from 0 to 2^n-1 where n is the length of the set
For each binary number, convert it to binary and use the 1's as indices to select elements from the set
Add the selected elements to the list of subsets
Return the list of subsets
Convert Roman numerals to integer in O(n) time
Create a dictionary to map Roman numerals to integers
Iterate through the string from right to left
If the current numeral is less than the previous, subtract it from the total
Else, add it to the total
Return the total
Given a list of numbers and symbols, provide an expression that evaluates to a target number.
Use recursion to try all possible combinations of numbers and symbols
Check for division by zero and negative numbers
Return False if no expression evaluates to the target number
Solve for x in a given expression with single variable.
Simplify the expression by applying the distributive property and combining like terms.
Isolate the variable term on one side of the equation and the constant terms on the other side.
Solve for x by dividing both sides of the equation by the coefficient of the variable term.
Check the solution by substituting the value of x back into the original equation.
In this case...
Given a hashmap M and an input string S, return an array of all possible mutations of S using M's substitutes.
Iterate through each character in S and get its substitutes from M
Use recursion to generate all possible combinations of substitutes for each character
Time complexity: O(n^m) where n is the average number of substitutes per character and m is the length of S
Space complexity: O(n^m) due to the number of possible...
Facebook implements graph search by indexing user data and using natural language processing.
Facebook indexes user data to create a graph of connections and relationships.
Natural language processing is used to interpret user queries and return relevant results.
Graph search allows users to search for specific information within their network, such as 'friends who like hiking'.
Facebook chat is a real-time messaging service that allows users to communicate with each other through the Facebook website or mobile app.
Facebook chat uses XMPP (Extensible Messaging and Presence Protocol) to enable real-time communication between users.
Messages are sent and received through Facebook's servers, which act as intermediaries between users.
Users can see when their friends are online and available to chat...
Facebook stores likes/dislikes as data points in their database.
Likes and dislikes are stored as separate data points.
Each like/dislike is associated with a unique ID for the post or comment.
The data is stored in Facebook's database and can be accessed through their API.
Likes/dislikes can also be used to personalize a user's newsfeed.
Facebook also uses likes/dislikes to gather data for targeted advertising.
Status updates can be implemented through various methods such as push notifications, real-time updates, and periodic polling.
Use push notifications to instantly update users on important changes.
Implement real-time updates using websockets or server-sent events for a seamless user experience.
Periodically poll the server for updates using AJAX or other similar technologies.
Provide a clear and concise interface for user...
A timeline/newsfeed can be implemented using a combination of algorithms and data structures.
Use a database to store user activity data
Implement an algorithm to sort the data by time
Use pagination to limit the number of items displayed at once
Include options for filtering and searching
Consider using caching to improve performance
Adding someone as a friend allows you to connect with them on the platform and see their updates.
When you add someone as a friend, they receive a notification and can choose to accept or decline your request.
Once they accept your request, you can see their updates and they can see yours.
You can also message each other and tag each other in posts.
Adding someone as a friend does not give them access to your personal info...
Hadoop is a distributed computing framework used for storing and processing large datasets.
Hadoop is based on the MapReduce programming model.
It allows for parallel processing of large datasets across multiple nodes.
Hadoop consists of two main components: HDFS for storage and MapReduce for processing.
It is commonly used for big data analytics, machine learning, and data warehousing.
Examples of companies using Hadoop in
FB messages work by allowing users to send and receive text, images, videos, and other media through the Facebook platform.
Messages can be sent to individuals or groups of people.
Users can also send voice messages and make voice and video calls through the messaging feature.
Messages can be archived or deleted, and users can also choose to ignore or block certain senders.
Facebook uses end-to-end encryption to protect th...
FB Mail is a messaging service that allows Facebook users to send and receive messages from other users.
FB Mail is integrated into the Facebook platform and can be accessed through the Messenger app or website.
Users can send messages to individuals or groups, and can also attach files, photos, and videos.
FB Mail also includes features such as message requests, message filtering, and message archiving.
Messages can be se...
I applied via Company Website and was interviewed in Jun 2024. There was 1 interview round.
I have implemented various technical improvements in codes to enhance performance and functionality.
Implemented caching mechanisms to reduce load times
Optimized database queries for faster retrieval of data
Introduced error handling techniques to improve code reliability
Utilized design patterns to make the codebase more maintainable
Refactored legacy code to adhere to best practices
I applied via LinkedIn and was interviewed in Jul 2024. There was 1 interview round.
I want to join Facebook because of its innovative technology, global impact, and opportunities for growth.
Innovative technology: Facebook is known for its cutting-edge technology and constant innovation.
Global impact: Working at Facebook would allow me to contribute to a platform that connects billions of people worldwide.
Opportunities for growth: Facebook offers a dynamic and fast-paced work environment with ample opp...
I appreciate the personalized news feed feature on Facebook.
Personalized news feed shows content based on user interests
Helps users stay updated on relevant information
Allows users to engage with content they are interested in
I applied via AmbitionBox and was interviewed before Oct 2023. There were 8 interview rounds.
I would like to teach a holistic approach to yoga and meditation that focuses on spiritual growth, physical well-being, and personal development for the next generation.
Incorporate mindfulness practices to cultivate self-awareness and inner peace
Teach asanas (yoga postures) for physical strength, flexibility, and balance
Guide students in pranayama (breath control) techniques for energy and relaxation
Introduce meditatio...
Whatever we know we have to discuss for each and every one to analyse the elements has different of quality of different of uses like that as I am a sky
Every person has come different places of different situation different area of different educations and different relationships so discussion of group is each and everyone to develop in self
Facebook interview questions for popular designations
I applied via Campus Placement and was interviewed in May 2024. There was 1 interview round.
Write program to sort data
Get interview-ready with Top Facebook Interview Questions
DSA round was there it was good
I applied via Job Portal and was interviewed in Dec 2023. There was 1 interview round.
I applied via Company Website and was interviewed in Dec 2023. There were 2 interview rounds.
All models should be made available or their complete information should be given in fresher training.
I applied for the position online and went through multiple rounds of interviews before being selected.
Applied online through company website
Participated in multiple rounds of interviews
Received offer after final interview
My ambition is to become a leading expert in embedded systems development, constantly pushing the boundaries of technology.
To continuously enhance my skills and knowledge in embedded systems design and development
To work on cutting-edge projects that challenge me and allow me to innovate
To eventually lead a team of talented engineers in creating groundbreaking embedded solutions
MVC (Model-View-Controller) architecture design pattern separates an application into three main components.
Model: Represents the data and business logic of the application
View: Represents the UI components of the application
Controller: Acts as an intermediary between Model and View, handling user input and updating the Model accordingly
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The duration of Facebook interview process can vary, but typically it takes about 2-4 weeks to complete.
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