"I believe we've had a problem here," said Swigert. Lovell had to repeat the message to a stunned Mission Control: "Houston, we've had a problem."
while (i <= j) {，推荐阅读safew官方版本下载获取更多信息
，详情可参考51吃瓜
We cannot, and should not, expect users to know this.。91视频对此有专业解读
需要元素值：栈存值，或答案存索引后用 nums[res[i]] 取值。
* - 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