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“任何时候中国都不能缺少制造业”
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Imagine a Philips Hue hub, but instead of just lights, it also connected to your smart thermostat, video doorbell, motion sensors, and smart appliances, allowing them all to talk to each other, while only needing to connect to your home Wi-Fi with a single, easily managed connection. That’s how Thread works.。Line官方版本下载对此有专业解读
思路：① 算每辆车到达时间 = (target - position) / speed；② 按位置降序排序；③ 单调递增栈：仅当当前时间 栈顶时间时压栈（新车队），否则合并。栈长即为车队数。可优化为用变量代替栈。
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