LeetCode taught me 300 solutions and zero patterns. So I build the version I needed.

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I did LeetCode for a year. Around 300 problems. I could pass an interview on a problem I had seen. On a new one I froze. Here is what went wrong for me, specifically. The title told me the answer. "Sliding window: maximum sum subarray." I read the pattern before the problem. Recognition never got practised. The explanation assumed I already knew. "Use two pointers" is a solution, not an explanation. Why two pointers? What in the text gave it away? Silence. Nothing connected to my job. I solved LRU cache as a puzzle. I shipped an actual LRU cache six months later

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AI 分析

痛点：刷 LeetCode 的人记住了几百道题解，却始终练不会识别新题的模式，题目一旦没见过就卡住。

目标用户：准备技术面试的软件工程师、CS 学生和转码求职者。

证据：I could pass an interview on a problem I had seen. On a new one I froze. / The solution button. Stuck for five minutes, click, read, forget. / I did LeetCode for a year. Around 300 problems.

变现：订阅制题库+课程（月付/年付），或按题包买断；后续可加 AI 讲解、模拟面试等增值功能。

MVP：2 周内做 20-30 道高频题的『信号→模式』训练器：每题三层深度讲解（Simple/Standard/Academic）、五级提示阶梯、以及真实系统落地的代码示例与测试。

竞品：NeetCode、AlgoExpert、Grokking the Coding Interview (Educative)、LeetCode Premium、Hello Interview

摘要：作者刷了一年约 300 道 LeetCode，发现能过见过的题但遇到新题就卡住，于是花约 2 个月业余时间做了一个强调『模式识别』的替代版本，每题提供三层深度讲解、五级提示阶梯和真实系统落地示例。痛点真实且市场已被验证，但面试刷题赛道极度拥挤（NeetCode、AlgoExpert 等），帖子本身没有付费意愿或收入数据，属于内容展示而非可直接变现的信号。