* - this.stack：单调递减栈，存储「价格对应的索引」，栈顶→栈底索引对应的价格单调递减
'The finest in the world': Why the US is buying icebreakers from Finland
，更多细节参见同城约会
The ESPN Select tier (for classic content, studio shows, and replays) is priced at $12.99 per month or $129.99 per year. ESPN Unlimited (all ESPN live channels and ESPN+ content) costs $29.99 per month or $299.99 per year.
Жители Санкт-Петербурга устроили «крысогон»17:52
，推荐阅读同城约会获取更多信息
$89.99 at Best Buy。91视频是该领域的重要参考
* @param n 数组长度