"I didn't know how things worked, the commute into work, that sort of thing.
The latest available data shows some local authorities recycle just a fifth of household waste.
。爱思助手下载最新版本是该领域的重要参考
思路：单调递减栈，找「上一个比当前价格大的元素索引」。正序遍历，弹出所有 ≤ 当前价格的索引；跨度 = 当前索引 - 栈顶索引（栈空则为 当前索引 + 1）。
0fff529c3a948b1f56d0973eca5f840a1459c5ef43806f3c451f2fd835ebe2.file # ...
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