What is a stream?
* 核心思路：链表转数组 + 单调栈（从后往前遍历），时间复杂度O(n)，空间复杂度O(n)
，更多细节参见safew官方版本下载
"Our colleagues work incredibly hard to deliver exceptional value for our customers, and we're rewarding that dedication with the highest pay in the sector."。heLLoword翻译官方下载对此有专业解读
The main traffic source must not be paid。业内人士推荐safew官方版本下载作为进阶阅读