Wireless Connectivity Certification Engineer

Meta

Implement a SnapshotArray that supports the following interface: SnapshotArray(int length) initializes an array-like data structure with the given length. Initially, each element equals 0. void set(index, val) sets the element at the given index to be equal to val. int snap() takes a snapshot of the array and returns the snap_id: the total number of times we called snap() minus 1. int get(index, snap_id) returns the value at the given index, at the time we took the snapshot with the given snap_id For example: Input: [SnapshotArray,set,snap,set,get] [[3],[0,5],[],[0,6],[0,0]] Output: [null,null,0,null,5] Explanation: SnapshotArray snapshotArr = new SnapshotArray(3); // set the length to be 3 snapshotArr.set(0,5); // Set array[0] = 5 snapshotArr.snap(); // Take a snapshot, return snap_id = 0 snapshotArr.set(0,6); snapshotArr.get(0,0); // Get the value of array[0] with snap_id = 0, return 5 What data structures and algorithms are best suited for this problem? What are the time and space complexities of each operation?

Meta

Let's design a stories feature, similar to Instagram or WhatsApp. These stories should disappear after a friend views them and only be available for 24 hours after publishing. Consider the following aspects: Functionality: How would users create and upload stories (photos and videos)? How would users view stories from their friends? How would you implement the 24-hour expiration? How would you handle the disappearing aspect after viewing? Scalability: How would you handle a large number of users uploading and viewing stories simultaneously? How would you efficiently store and retrieve stories? How would you manage the storage as stories expire? Data Model: What database schema would you use to store story information (user, timestamp, media URL, view status)? How would you track which users have viewed a story? Technical Challenges: What are the potential challenges in implementing this feature? How would you address issues like latency, storage limitations, and data consistency? Edge Cases: How would you handle users with slow internet connections? What happens if a user uploads a story right before the 24-hour mark? How would you handle deleted user accounts and their associated stories?

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.