上周刚陪一个在美硕士学员完成 Stripe 2026 New Grad OA 的全程代做。这位同学是 CS 转 DS 背景,项目经验扎实但刷题量有限,前两次 OA 因逻辑混乱被筛。后来了解到我们的 “系统模拟类 OA 代码协作方案”,决定委托我们进行全流程代做。
他的核心痛点在于:能理解需求但无法高效组织代码逻辑。这类多阶段系统模拟题需要同时维护服务器状态、连接映射、对象分配等复杂关系,稍有不慎就会导致变量冲突。我们的技术团队通过实时共享代码编辑器,在 60 分钟内完成了从需求分析到代码提交的全流程操作。
最终结果超出预期 ——HackerRank 平台全程录屏通过,5 个测试用例全部绿灯。整个过程中,学员仅需在关键节点确认逻辑,其余代码编写、调试优化均由我们的工程师完成。
Stripe OA 概览
- 公司:Stripe
- 岗位:Software Engineer / New Grad 2026
- 平台:HackerRank(全程录屏 + 摄像头)
- 题量:1 道题,共 5 个 parts
- 时长:60 分钟
- 难度:中偏易(关键在逻辑,不在算法)
- 语言限制:可选 Python / Java / C++
这一场属于典型的 系统状态模拟类 OA。
不像 LeetCode 那种算法题,而是更考察你的 “思路管理能力” —— 要能同时跟踪服务器、连接、对象、容量等多个状态。
Stripe 26 New Grad OA 题目回忆版
Design a Server Load Balancing System
You are given:
numServer: total number of serversMaxConnection: maximum connections each server can handlerequests[n]: a list of incoming requests
Each request can be one of:CONNECT, DISCONNECT, or SHUTDOWN.
Your task is to simulate how servers manage these requests and return a log of all accepted connections.
Part 1
Handle only CONNECT requests.
Each CONNECT request is represented as:
["CONNECT", connectId, userId, objId]
Routing rule:
- Choose the server with the smallest current connection count.
- If multiple servers have the same number of connections, choose the one with the smaller index (Server 1, Server 2, …).
Output which server each connection is routed to.
Part 2
Add DISCONNECT requests:
["DISCONNECT", connectId, userId, objId]
Part 3
Add an optimization rule:
If multiple CONNECT requests share the same objId, they should all be routed to the same server (if possible).
Part 4
Add the capacity limit:
Each server can hold at most MaxConnection connections.
If a server is full, skip (reject) the new connection and don’t add it to the log.
Part 5
Add the SHUTDOWN operation:
["SHUTDOWN", serverId]
When a server is shut down:
- All its current connections should be reassigned to other active servers following the same rules.
- If reassignment fails (because all servers are full), drop those connections.
- Remove the shutdown server from the active pool.
常见坑点
- Part 3:相同 obj 的 server 已经满时,必须重新找新的 server。
- Part 5:shutdown 后要删除 obj_to_server 对应映射,否则会指向已失效 server。
- 被拒绝或被丢弃的连接不记 log。
- shutdown 后要重新 route 旧连接,不能直接忽略。
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