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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But in 2022-24 Antarctic sea ice shrank significantly, largely down to climate change, depriving the birds of safe places to moult.
And millions of fans from around the world will be watching every moment. Fortunately for this dedicated group of followers, it has never been easier to watch the biggest fight nights without spending anything.
Nature, Published online: 24 February 2026; doi:10.1038/s41586-026-10298-w