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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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The hoard, which dates to about 50BC and AD50, included five shield bosses and an iron object of unknown origin.，更多细节参见雷电模拟器官方版本下载
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