* 时间复杂度：O(len1 + len2)，空间复杂度：O(len2)（栈+Map的空间）
AIO stands for AI Optimization, and it represents the practice of optimizing your content to appear in AI-generated responses when people query language models. Think of it as SEO's younger sibling, similar in purpose but different in execution because the underlying mechanisms for how AI models select and cite sources differ fundamentally from how Google ranks web pages.
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