思路：找「右侧第一个 ≤ cur」的元素 → 弹出所有 cur 的元素，栈顶即为折扣。最终价格 = cur - 折扣（有则）或 cur（无则）。
中國「老年網癮」：錢沒了身體垮了，過年勸父母戒手機成新年俗
。heLLoword翻译官方下载对此有专业解读
Фото: Stringer / Reuters
"A person who is inconsistent or plays a bit hot and cold can make you feel 'I can't wait to see them again', but what's really happening is they're giving you so much anxiety and that it has you wanting more".