今天上午刚带一位学员刚做完 MathWorks 的最新 OA，两道编程题全程只花了 15 分钟就 AC 掉了，整体难度中等偏下，偏重基础逻辑与模拟实现。下面整理一下题目与思路，给还没做的同学参考一下。
Q1: Valid Parentheses String
Problem:
You are given several strings containing only parentheses characters '(', ')', '{', '}', '[', ']'.
For each string, determine if it is valid — meaning all brackets are closed and ordered correctly.
Solution Idea:
Use a stack to simulate the matching process.
- Traverse each character:
- If it’s an opening bracket, push it to the stack.
- If it’s a closing bracket, check whether it matches the top element of the stack.
- If it matches, pop; otherwise, return invalid immediately.
At the end, if the stack is empty, the string is valid.
This is basically the LeetCode “Valid Parentheses” template question — super straightforward, perfect warm-up.
Q2: Maximum Overlapping Team Size
Problem:
You are given n time intervals representing the working hours of different teams.
Find the maximum number of teams that are active (overlapping) at the same time.
Solution Idea:
Classic interval overlap problem — similar to “Meeting Rooms II.”
- Extract all start and end points.
- Mark starts as
+1, ends as-1. - Sort all points by time, and accumulate the counts.
- Keep track of the maximum cumulative value — that’s the maximum overlapping team size.
It can also be done via prefix counting or sweep line method; both are efficient since the input size is small.
OA Overall Review
这次 OA 两道题都非常常规，难度和 LeetCode Easy ~ Medium 持平。
系统界面简洁，输入输出没坑，时间 60 分钟足够。学员因为之前在我们这边练过几次“逻辑+实现题”模拟，整个流程几乎是 autopilot 模式，全程稳到不行。
MathWorks 的 OA 没有算法陷阱，考的其实就是 coding 手感和基础题熟练度，节奏和沟通感比技巧更重要。
FAQ：MathWorks OA 常见疑问
Q1: OA 是在什么平台做的？
官方自家平台，界面清爽稳定，不需要额外安装插件。
Q2: 有没有拍摄或监控？
没有摄像头监控，但全程录屏检测环境，不建议切屏。
Q3: 题目风格？
偏向基础算法和逻辑题，代码要求简洁清晰，不考奇技淫巧。
Q4: 难度相比其他公司？
明显比金融类 OA（Citadel、IMC）轻松，也比 Amazon OA 简单，属于“纯 coding 实现”型测试。
Programhelp 让你在实战中突出重围
MathWorks 这种逻辑+实现型 OA，最容易在细节上掉分（边界、格式、时间管理）。我们这边提供的 远程无痕助攻方案，能在限定时间内帮你：
- 实时语音提醒输入输出规范；
- 模拟官方环境预演；
- 联机无痕协作，保证代码节奏与思路同步；
- 附赠常见题型复盘。
不少同学靠这套方案稳稳拿到 MathWorks、NVIDIA、Stripe 等公司面邀。
如果你也想提前预演 OA 节奏，欢迎私信了解最新方案。
