圖像來源，New York State Division of Criminal Justice Services
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。
，更多细节参见快连下载安装
* 时间复杂度：O(n log n)（主要来自排序），空间复杂度：O(n)
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