In an internet where you’re more likely to interact with bots than actual humans online, while children become more technologically savvy everyday and can navigate phones better than they can bikes, social media platforms are looking for ways to balance keeping people’s privacy top of mind while ensuring the safety of their underage users. Unfortunately, these two parameters often come in contradiction with one another, and the lack of government oversight means there’s little incentive for these companies to pursue anything more than keeping the status quo.
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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）。