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思路：倒序遍历 2 倍长度 + 取模模拟循环 + 单调栈。用 i % len 映射到真实索引，仅当 i < len 时记录答案。
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expect. Just a year or two later, a now-forgotten company called Docutel was，更多细节参见谷歌浏览器【最新下载地址】
Source: Computational Materials Science, Volume 266
然而，总有巨头能打破常规。在普遍受“分母”影响的背景下，千亿元研发投入的华为，研发强度达到20.85%，位列5896家有效企业的前9%。当企业将研发作为核心竞争力而非成本项时，有望跳出规模与创新的博弈，实现“研发强度与营收规模双高”的罕见平衡。