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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。
，更多细节参见safew官方版本下载
Many owners sitting on 3% to 4% mortgage rates still hesitate to trade up, but the gap between their existing rate and today’s has narrowed enough that life events like family changes and relocations are starting to push more listings onto the market, according to Realtor.
石头科技业绩快报：2025年净利润13.6亿元，同比下降31.19%