If you've had your eye on the sleek Bose QuietComfort headphones, this is a great opportunity to grab them for just under $200 at Amazon.
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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Parents will also be able to view expert-designed content to talk to their teen about suicidal feelings, if they so choose. In cases of imminent physical harm, Instagram will notify emergency services, a long-standing policy.
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