需要元素值：栈存值，或答案存索引后用 nums[res[i]] 取值。
// 3. 从后向前遍历，稳定排序的关键！
。heLLoword翻译官方下载是该领域的重要参考
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Baroness Amos also said in a statement that it was "clear from the meetings and conversations I have had with hundreds of women, families and staff members across the country, that maternity and neonatal services in England are failing too many women, babies, families and staff".
For implementers, backpressure adds complexity without providing guarantees. The machinery to track queue sizes, compute desiredSize, and invoke pull() at the right times must all be implemented correctly. However, since these signals are advisory, all that work doesn't actually prevent the problems backpressure is supposed to solve.