**1.CPU Processes**

A Unix system administrator notices that a production server is running slower than usual. They suspect that a rogue process is consuming an excessive amount of CPU resources. The administrator wants to identify the top CPU-consuming processes, how long they have been running, and which user initiated each of these processes.

Which command should the system administrator use to list the top CPU-consuming processes along with the username of the person who started each process and the elapsed time since each process was started?

Pick ONE option

- ps aux --sort=-%cpu | head
- top -u
- netstat -tuln
- find / -user root -name "*.log"

**2.Phi Function Calculation**

A team of cryptographers develops a Python function, calculate_phi(n), in their cryptographic software. This function performs three primary tasks: it generates a list of prime numbers up to 'n', checks if 'n' is a prime number, and performs a specific calculation based on whether 'n' is prime. The code structure is as follows.

In the context of the calculate(n, primes) inner function, which of the following statements is accurate?

Pick ONE option

- It returns n-1 only when 'n' is identified as a prime number.
- It employs a lambda function to derive a specific mathematical value.
- It correctly modifies the value of 'phi' for each prime factor of 'n'.
- It works efficiently for very large numbers, up to 10^12.

**3.Bandwidth Distribution**

Total bandwidth is total_bandwidth units and there are n API endpoints. The i^th endpoint needs a bandwidth of bandwidth[i] to be functional, and the expected number of requests for the endpoint is request[i]. Given total_bandwidth, bandwidth, and request, find the maximum total number of requests that can be served by optimally allocating bandwidth to different endpoints.

**4.Message Delivery System**

In this task, a basic message delivery service is to be implemented that has a rate-limiting algorithm that drops any message that has already arrived in the last k seconds.

Given the integer k, a list of messages as an array of n strings, messages, and a sorted integer array timestamps representing the time at which the message arrived, for each message report the string "true" if the message is delivered and "false" otherwise.

本次的tiktok没有sql题目，而是3个算法题

题目1涉及Unix系统管理，具体是识别消耗CPU资源的进程。这是一个实际的系统监控场景，考察了候选人对Unix命令行工具的熟悉程度。正确的命令能帮助系统管理员快速定位问题。

题目2探讨了一个数学函数calculate_phi的Python实现，这个问题测试了编程和数学技能的结合使用。代码结构清晰，考查了对算法优化的理解。

题目3是一个资源分配问题，要求最大化API端点的请求数。这是一个优化问题，涉及贪心算法，考察了解决实际问题的能力。

题目4设计了一个消息传递系统，它要求实现一个限速算法。这个问题考查了数据结构和算法知识，特别是对时间复杂度的理解。

题目5暂不公布。

Question 1 is a typical Unix system management scenario, evaluating the candidate's understanding of system process monitoring. It serves to assess the practical ability to handle system performance issues.

Question 2 combines programming with mathematical knowledge, testing the candidate's ability to program solutions for mathematical computations. Its structure is clear and challenges algorithmic optimization skills.

Question 3 is an optimization problem related to resource allocation, testing the candidate's ability to solve practical problems using greedy algorithms. It involves algorithm design and problem-solving skills.

Question 4 involves designing a rate-limited message delivery system, examining the candidate's knowledge of data structures and algorithms, particularly with regard to time efficiency.

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