暴力做法是对每个位置向右扫描找第一个更大值，O(n²)。可抽象为：元素像一排人，身高为数值。当前人「下一个更大」= 他右侧第一个没被挡住的人（比当前矮的都被挡住）。单调栈用 O(n) 维护「右侧候选更大值」：倒序遍历，弹掉 ≤ 当前的，栈顶即答案，再入栈当前值。
With spring on the way, it's time to throw the windows open and get a fresh start. For the past two years, Amazon has launched its Big Spring Sale, a now annual event that brings major markdowns to warm-weather items ahead of the new season. While Amazon hasn't provided an official announcement for its 2026 spring sale, we suspect that it's coming soon.
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