// 数组完全有序，直接返回0
Backpressure is strict by default. When a buffer is full, writes reject rather than silently accumulating. You can configure alternative policies — block until space is available, drop oldest, drop newest — but you have to choose explicitly. No more silent memory growth.
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Appendix I: Candidate Sorting。关于这个话题，一键获取谷歌浏览器下载提供了深入分析
* 核心思路：倒序单调栈（适配你的学习习惯），时间复杂度O(n)，空间复杂度O(n)。同城约会对此有专业解读
At least 15 killed after military plane carrying banknotes crashes in Bolivia