nums[i] = n * n
* 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)
，详情可参考同城约会
看脱贫地区，“产业普遍搞起来了，但技术、资金、人才、市场等支撑还不强”。。业内人士推荐同城约会作为进阶阅读
Playing property tycoon Nile Jarvis, Rhys said that he "stole" some of the character's traits from Sir Anthony Hopkins' Oscar-winning performance in The Silence of The Lambs.
Output: their sum as an integer