20+ Meta Interview Questions and Answers

Efficiently calculate the sum of a matrix

• Iterate through each element in the matrix and add them to a running total

• Use parallel processing or multi-threading to calculate the sum faster

• Consider using optimized algorithms like Strassen's algorithm for matrix multiplication

Find and return all substrings in a main string that match a given string.

• Iterate through the main string and check for matches with the given string

• Use substring function to extract potential matches

• Store all matching substrings in an array and return it

A sparse matrix can be represented using a dictionary of dictionaries or a list of lists.

• Use a dictionary of dictionaries where the keys are the row and column indices with non-zero values as values.

• Alternatively, use a list of lists where each inner list represents a row with non-zero values and their column indices.

• Sparse matrices are efficient for large matrices with mostly zero values.

• Example: {0: {1: 5, 3: 7}, 2: {2: 3}} represents a 3x4 matrix with non-zero values at (0...read more

A metrics tracker to monitor and analyze key performance indicators

• Define the key metrics to track (e.g. user engagement, conversion rates)

• Implement a data collection system to gather relevant data

• Create visualizations and reports to analyze the metrics

• Set up alerts for abnormal metric values

• Regularly review and update the metrics based on business goals

Use a stack to ensure balanced parenthesis in a string

• Iterate through each character in the string

• If the character is an opening parenthesis, push it onto the stack

• If the character is a closing parenthesis, pop from the stack and check if they match

• If at the end the stack is empty, the parenthesis are balanced

Find all palindromic substrings in a given string.

• Iterate through each character in the string and expand around it to find palindromic substrings.

• Store all palindromic substrings in an array of strings.

Clean maze using a robot by navigating through paths and avoiding obstacles.

• Create a map of the maze with obstacles and paths.

• Implement a pathfinding algorithm for the robot to navigate through the maze.

• Use sensors or algorithms to detect and avoid obstacles.

• Track the robot's progress and clean the maze efficiently.

Online coding judge to evaluate code submissions and provide feedback.

• Create a web application where users can submit code in various programming languages.

• Implement a compiler or interpreter to execute the code and check for errors.

• Provide feedback on code correctness, efficiency, and style.

• Include test cases to verify the code's functionality.

• Allow users to view their submission history and track their progress.

Design a live chess game

• Create a server-side application to handle game logic and communication

• Implement a client-side application for players to interact with the game

• Use a database to store game state and player information

• Implement real-time updates using websockets or similar technology

• Design a user-friendly interface for players to make moves and view the board

When the browser first visits facebook.com, it goes through multiple protocols in different layers.

• The browser first resolves the domain name using DNS (Domain Name System).

• Then, it establishes a TCP (Transmission Control Protocol) connection with the server.

• Next, it performs an SSL/TLS handshake to establish a secure connection.

• After that, the browser sends an HTTP (Hypertext Transfer Protocol) request to the server.

• The server processes the request and sends back an HTTP res...read more

Meta is a leading company in AI space with a focus on developing innovative technologies and solutions.

• Meta (formerly Facebook) is known for its advanced AI research and development.

• Meta uses AI for various applications such as content moderation, personalized recommendations, and virtual assistants.

• Meta's AI technologies power products like facial recognition, language translation, and image recognition.

Implemented a critical software upgrade with multiple bugs affecting production.

• Identified bugs through thorough testing and analysis.

• Collaborated with development team to prioritize and resolve issues.

• Implemented temporary workarounds to minimize impact on production.

• Conducted post-mortem analysis to prevent similar issues in future upgrades.

I failed to implement a preventive maintenance program due to lack of buy-in from the team.

• Lack of clear communication about the benefits of the program

• Resistance from team members who preferred reactive maintenance

• Inadequate training and support for team members to adapt to the new program

To calculate the displacement of a bike without tools, measure the distance traveled in one full rotation of the wheel

• Measure the circumference of the bike's wheel

• Count the number of rotations the wheel makes over a certain distance

• Multiply the circumference by the number of rotations to get the displacement

• Displacement = Circumference of wheel x Number of rotations

I would rate my SQL skills as advanced.

• Proficient in writing complex SQL queries

• Experienced in optimizing database performance

• Skilled in data manipulation and analysis using SQL

• Familiar with stored procedures and functions

• Have worked on large datasets in previous projects

I would rate my Python skills as advanced.

• Proficient in data manipulation and analysis using pandas and numpy

• Experience with data visualization libraries like matplotlib and seaborn

• Familiar with machine learning libraries such as scikit-learn

• Comfortable working with APIs and web scraping using requests and BeautifulSoup

Calculate the distance between two points in a 2D plane.

• Use the distance formula: sqrt((x2 - x1)^2 + (y2 - y1)^2)

• Ensure input validation for coordinates

• Consider edge cases like points being the same or on the same axis

Code assessment measures the ability of a software developer to write efficient and effective code.

• Code quality and readability are important factors in code assessment.

• Efficiency and performance of the code are also key aspects to consider.

• Ability to solve complex problems and think critically is evaluated through code assessment.

• Knowledge of programming languages, algorithms, and data structures is tested in code assessment.

• Examples: writing a sorting algorithm, optimizing ...read more