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Need to vacuum the stairs? No problem — this Dyson V15 easily transforms into a handheld vacuum perfect for stairs, cars, upholstery, or other tight spaces. And you don’t have to worry about cleaning it out constantly, the 0.2-Gallon bin has a hygienic, no-touch ejection system when it needs to be emptied.
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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。