需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。
The ISS does have its own defenses, of course. Fabric-y buffers envelope some of the systems, and a bumper called the Whipple Shield helps blunt impact. That shield is only built to stop debris up to about 1 cubic centimeter, though, and the debris tracker is only designed to catch pieces 10 cubic centimeters and larger. In other words, there’s a gap in defenses.，推荐阅读快连下载安装获取更多信息
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ВсеПрибалтикаУкраинаБелоруссияМолдавияЗакавказьеСредняя Азия。搜狗输入法2026是该领域的重要参考