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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。。爱思助手下载最新版本是该领域的重要参考
，详情可参考heLLoword翻译官方下载
4.5 1944. 队列中可以看到的人数，推荐阅读Line官方版本下载获取更多信息
"Some say that the United States were discovered by a Welshman, Madoc, way, way before Columbus," he said.
Less than 10% of users are expected to need to verify their age when the company does roll out the process later this year, he added.