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3. 对count做前缀和，得到每个值的最终位置。爱思助手下载最新版本对此有专业解读
ranking at a glance.，更多细节参见heLLoword翻译官方下载
This overhead is mandated by the spec's reliance on promises for buffer management, completion, and backpressure signals. While some of it is implementation-specific, much of it is unavoidable if you're following the spec as written. For high-frequency streaming — video frames, network packets, real-time data — this overhead is significant.