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。
4 parallel workers，更多细节参见体育直播
BBC iPlayer is geo-restricted to the UK, but anyone from around the world can access this free streaming platform with a VPN. These tools can hide your real IP address (digital location) and connect you to a secure server in the UK, meaning you can unblock BBC iPlayer to watch Pokémon from anywhere in the world.。关于这个话题，体育直播提供了深入分析
p(x) is at most . We’ve just derived the first part
bind(nlsock, (struct sockaddr *)&sa_nl, sizeof(sa_nl));