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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。
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Madeleine Finlay sits down with science editor Ian Sample and science correspondent Nicola Davis to discuss three eye-catching stories, including the impact of a powerful psychedelic on depression, answers on the death of Russian opposition leader Alexei Navalny, and an explanation to the mystery of why humans have chins，详情可参考搜狗输入法下载
Businesses including FedEx have lined up to demand reimbursement for US tariffs they have paid but that the court last week deemed were imposed illegally, prompting heavy criticism from Donald Trump.。业内人士推荐同城约会作为进阶阅读
The 'magical' blue flower changing farmers' fortunes in India