Machine Learning Algorithm Engineer

Apple

Given a string expression of numbers and operators, return all possible results from computing all the different possible ways to group numbers and operators. You may return the answer in any order. The test cases are generated such that the output values fit in a 32-bit integer and the number of different results does not exceed 104. For example: If the input is expression = 2-1-1 The expected output is [0,2] Because: ((2-1)-1) = 0 (2-(1-1)) = 2 If the input is expression = 23-45 The expected output is [-34,-14,-10,-10,10] Because: (2(3-(45))) = -34 ((23)-(45)) = -14 ((2(3-4))5) = -10 (2((3-4)5)) = -10 (((23)-4)5) = 10 Constraints: 1 <= expression.length <= 20 expression consists of digits and the operator '+', '-', and '*'. All the integer values in the input expression are in the range [0, 99]. The integer values in the input expression do not have a leading '-' or '+' denoting the sign.

Apple

You're troubleshooting a mission-critical server (cannot be rebooted) that is experiencing severe lag. You only have terminal access. Describe your debugging process, including specific commands and tools you'd use to diagnose the issue. For example, would you start by checking CPU usage, memory consumption, or disk I/O? What commands would you use to identify the most resource-intensive processes? How would you investigate potential network bottlenecks or file system issues? Be as detailed as possible in outlining your approach to pinpointing the cause of the lag and suggesting potential solutions, keeping in mind that a reboot is not an option.

Apple

Let's explore the concept of feedback amplifiers in the context of software development teams. Imagine you are leading a team working on a critical feature for a new mobile application. Communication bottlenecks and misunderstandings are starting to impact the team's velocity and morale. As a senior engineer, you recognize the need to amplify feedback loops to improve team performance. Describe what a feedback amplifier is and how it works in practice.** Provide concrete examples of how you would implement feedback amplifiers within your team. Consider different types of feedback, such as code reviews, sprint retrospectives, and individual performance reviews. Explain the benefits of using feedback amplifiers.** How can they improve code quality, reduce bugs, and increase team collaboration? Quantify the potential impact using hypothetical scenarios or past experiences. For instance, how might more frequent code reviews, coupled with automated static analysis, lead to a measurable reduction in the number of bugs discovered in production? Discuss the potential challenges and pitfalls of implementing feedback amplifiers.** What steps would you take to mitigate these risks? Think about issues like information overload, negative feedback bias, and the time investment required to implement and maintain effective feedback loops. How would you ensure that the feedback process remains constructive, fair, and actionable for all team members? Elaborate on your answer by considering specific tools or techniques you have used in the past to amplify feedback, such as using dashboards to visualize key performance indicators, conducting regular pulse surveys to gauge team sentiment, or establishing a system for tracking and resolving action items from retrospective meetings. Also, discuss how you would tailor your approach based on the size and structure of the team, as well as the specific project goals and constraints.