* 核心思路：单调递减栈（找「上一个比当前价格大的元素索引」），时间复杂度O(n)，空间复杂度O(n)
村里的老人记得那天“交易”的情形：阿爸被放在一个旧菜篮子里，垫着布。篮子旁挂着一捆用红绳扎着的长寿面。阿嬷把钱交出去，孩子抱走。
。夫子对此有专业解读
# What you gain
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