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（三）在铁路、城市轨道交通线路、桥梁、隧道、涵洞处挖掘坑穴、采石取沙的；
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Even this relatively clean version requires: a TransformStream, manual TextEncoder and TextDecoder, and explicit lock release.
competitor analysis than Ahrefs. However, Ahrefs offers a lot of functionality
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。