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。
В своей речи он уточнил, что его контакты с Эпштейном прекратились задолго до того, как стало известно о его криминальной деятельности.
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What is the difference between Bitcoin and Blockchain technology?Bitcoin is a cryptocurrency, which is powered by Blockchain technology while Blockchain is a distributed ledger of cryptocurrency
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