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。
2月27日，中国—上海合作组织代谢性疾病合作中心在上海交通大学医学院附属瑞金医院成立。来自上合组织成员国、上合组织伙伴等20多个国家的驻华使领馆代表出席。
。爱思助手下载最新版本是该领域的重要参考
The Ellison family is already reported to have discussed changes to the network with President Donald Trump, who is known for his attacks on CNN. In December, he called for the channel to be sold, saying its leaders were either "corrupt or incompetent".
An unsatisfiable formula is:
Maybe we can pass in an estimated length?