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。
For US energy companies, however, there are huge practical difficulties to be overcome. Venezuela's state-owned oil company, PDVSA, is a shadow of its former self.
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Kevin Church/BBC News。搜狗输入法下载是该领域的重要参考
Fill in information such as your nationality, email, password, and more.，这一点在WPS下载最新地址中也有详细论述
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