🧩 Problems

系統設計題,依領域分組。每題標出練到的概念,可回連概念頁。

⚙️ Infra & Platform

📰 Social & Feed

📦 Storage & File

⏱️ Realtime

🗺️ Geo & Location

💳 Fintech

🤖 ML Systems

✨ GenAI & LLM

📱 Mobile