Observe the world
System design sparring
Prompts you copy and take elsewhere. Paste one into any large model and it plays the interviewer, asking you through the problem scene by scene rather than reciting the answer.
These prompts only exist in 简体中文 for now.
How to use this
How to start
- Pick a question, open it, copy the prompt.
- Paste it into a brand-new conversation — not one where you already discussed this question, or the model follows your old answers.
- Say nothing. Wait for its first question.
Four commands you can call out at any time
跳过move to the next scene now提示give a direction, not the answer直说吧spell this point out in full, then keep pressing on the trade-offs复盘jump to the wrap-up and print the review card
Three traps
- Don't do two questions in one conversation — context from the first makes the model prejudge your level.
- Don't look up the answer the moment it asks. Being stuck for 30 seconds is itself useful information.
- When it starts praising you, point it back to rule five — feeling validated crowds out noticing what you missed.
Suggested order: start with the cross-cutting drill as a parts test, use the short-link question to get used to the flow, then pick by the direction you interview for, and keep redoing the one about your own project.
Frequently asked
秒杀 / 限时抢购
一秒钟涌进来十万个人，只有一百件货。
支付系统
钱不能多也不能少，而第三方随时超时。
订单与库存（电商交易链路）
一条链路跨四个服务，中间任何一步都可能失败。
优惠券 / 红包
发一亿张券，核销不能重复，拆红包不能多出一分钱。