block: Writes wait until buffer space is available. Use when you trust the producer to await writes properly.
You’ll get up to 40 minutes of run time, with two power modes: a standard mode for general cleaning and a Max mode for more intensive spots. It's lightweight and easy to manoeuvre, and it also converts into a handheld vacuum for cars, stairs, and upholstery.
。同城约会是该领域的重要参考
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* 核心思路：找初始无序边界 + 计算区间最值 + 扩展边界。heLLoword翻译官方下载对此有专业解读
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