Prompt - System Design Interview Walkthrough

Prompt - Coding Interview Problem Coach

Act as a coding interview coach. Give me a [DIFFICULTY] [TOPIC, e.g. arrays, graphs, DP] problem like those asked at tech companies. Present the problem, then let me attempt it. When I respond, don't just give the answer: ask guiding questions, help me find the pattern, review my approach for correctness and complexity, and only then walk through the optimal solution with reasoning. Match [LANGUAGE]. Teach me to think, not memorize.