Research Engineer, Machine Learning L6

Netflix

Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could represent. Return the answer in any order. A mapping of digit to letters (just like on the telephone buttons) is given below. Note that 1 does not map to any letters. 2: abc 3: def 4: ghi 5: jkl 6: mno 7: pqrs 8: tuv 9: wxyz Example 1: Input: digits = 23 Output: [ad,ae,af,bd,be,bf,cd,ce,cf] Example 2: Input: digits = Output: [] Example 3: Input: digits = 2 Output: [a,b,c]

Netflix

Design a thread synchronization function to access common resources. Imagine you have multiple threads that need to access and modify a shared data structure, such as a counter or a list. Without proper synchronization, race conditions can occur, leading to unpredictable and incorrect results. For example, two threads might try to increment the same counter simultaneously, resulting in only one increment instead of two. Your task is to design a function or mechanism that allows these threads to safely access and modify the shared resource. Consider the following requirements: Mutual Exclusion: Only one thread should be able to access the shared resource at any given time. Fairness: Threads should not be indefinitely blocked from accessing the resource (no starvation). Efficiency: The synchronization mechanism should not introduce excessive overhead that significantly impacts performance. Explain your design choices, including the type of synchronization primitive you would use (e.g., mutex, semaphore, condition variable), how it would be implemented, and how it would ensure mutual exclusion, fairness, and efficiency. Provide code snippets or pseudocode to illustrate your solution. Discuss potential issues such as deadlocks and how to prevent them. How would your design handle a scenario with a high number of threads contending for the resource?

Netflix

Tell me about a time you went above and beyond in a project. What was the situation, what actions did you take, and what was the result? For example, perhaps you identified a critical bug that wasn't in your assigned area and took the initiative to fix it, or maybe you proactively automated a manual process that saved the team significant time. Detail the specific steps you took and the impact your actions had on the project's success or the team's efficiency. What did you learn from that experience, and how has it influenced your approach to projects since then? Focus on demonstrating your problem-solving skills, your ability to anticipate needs, and your commitment to delivering exceptional results.