Hardware Engineer

Meta

You are given a binary tree. Write a function to flatten the binary tree into a linked list in-place. The linked list should be in the same order as a pre-order traversal of the binary tree. This means that for each node, the right pointer should point to the next node in the pre-order traversal, and the left pointer should be null. For example, consider the following binary tree: 1 / 2 5 / 3 4 6 After flattening, the tree should look like this: 1 -> 2 -> 3 -> 4 -> 5 -> 6 Each node's right pointer points to the next node in the pre-order traversal, and all left pointers are null. Clarifications: The function should modify the tree in-place. The pre-order traversal should be followed. The left pointers of all nodes should be set to null after flattening. Could you provide an efficient algorithm to accomplish this, and what is the time and space complexity of your solution?

Meta

Let's design a system to efficiently manage meeting room bookings for a large company. Consider the following: Scalability: The system should handle a large number of meeting rooms and employees. Concurrency: Multiple users should be able to book rooms simultaneously without conflicts. Features: Room availability search based on time, date, and number of attendees. Recurring meeting support. Integration with employee calendars (e.g., Google Calendar, Outlook). Conflict detection and resolution. Reporting and analytics (e.g., room utilization). Example: Imagine a company with 100 meeting rooms and 5000 employees. A user wants to book a room for a daily stand-up meeting with 10 attendees, recurring every weekday for the next month. How would your system handle this request, ensuring no double bookings and updating the user's calendar? Specifically, discuss the system architecture, data models, key algorithms, and potential bottlenecks. How would you address these bottlenecks to ensure the system remains responsive and reliable?

Meta

Let's explore your motivations for applying to Facebook. To give me a comprehensive understanding, please elaborate on the specific factors that attracted you to our company. Consider these points in your answer: Company Mission and Values: How do Facebook's core values and mission align with your personal beliefs and career aspirations? Provide specific examples of Facebook initiatives or projects that resonate with you and explain why. Company Culture: Describe your understanding of Facebook's work culture. What aspects of our culture appeal to you, and how do you believe you would contribute to maintaining and enhancing this environment? For example, have you heard about our emphasis on open communication, rapid iteration, or continuous learning, and how do these resonate with your work style? Specific Opportunities: Are there particular teams, roles, or projects at Facebook that excite you? Detail why you are interested in these specific opportunities and how your skills and experience would be a valuable asset to the team. For instance, are you drawn to our work in AI, VR/AR, or social networking, and what specific projects are you aware of that match your skillset? Growth and Development: What are your long-term career goals, and how do you see Facebook helping you achieve them? Discuss the opportunities for learning, growth, and professional development that you believe Facebook offers and how these align with your aspirations. Impact: What kind of impact do you hope to make at Facebook? Do you want to influence millions of users, solve complex technical challenges, or contribute to innovative products? Explain how you would like to make a difference and why you believe Facebook is the right place for you to do so. By providing a detailed and thoughtful response that covers these areas, you will give me a clear picture of your passion for Facebook and your potential to contribute to our team.