竞争壁垒稀释的压力同样不容忽视。雅迪、爱玛等传统巨头正将智能化功能下放到中低端车型，直接冲击九号的高端市场份额；割草机器人赛道面临科沃斯、追觅等品牌的低价围剿，RTK + 视觉技术优势不再独家。更值得警惕的是，公司核心发明专利占比不高，2024 年研发投入 8.26 亿元，远低于雅迪的 11.47 亿元，长期创新能力面临考验。
Additional reporting by Helen Briggs
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// 易错点4：栈空时要存-1（题目要求无更大值返回-1），而非直接存stack2.at(-1)（会得到undefined）