A few years ago I solved 200 LeetCode problems and still froze on Mediums I hadn't seen. The breakthrough wasn't another hundred problems. It was a different loop. A problem asks for the longest substring with at most K distinct characters. You've solved sliding window before. Maximum sum subarray of size K, done. Longest substring without repeating characters, done. This third one stalls you. Twe
A journalist recently called out DeepSeek for its "serious lying problem" — the model can write a beautifully crafted biographical sketch in classical Chinese style, but the person's birthplace, mother's surname, and life events are all fabricated. This isn't an isolated incident; it's one of the most stubborn bugs in the LLM industry, and it has a name: AI Hallucination. Right after the May Day h