1. 选择步长序列（如: n/2, n/4, ..., 1）
But no one is ready to say when hundreds of new missile silos, dug from the windswept Great Plains, will be finished, how much they cost, or, for that matter, how many nuclear warheads each Sentinel missile could actually carry.。关于这个话题，服务器推荐提供了深入分析
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The snow is melting, the days are getting longer, and I can almost smell the springtime ahead. Soon, we'll be cruising around town on ebikes and electric scooters instead of burning fossil fuels. For now, the weather hasn't quite caught up, which is great for markdowns. Many of the best electric scooters are still seeing significant discounts. If you've been thinking about buying one, now's the best time: prices are low, and sunny commuting days are just ahead.。关于这个话题，旺商聊官方下载提供了深入分析
需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。