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）。
float white_noise(int x, int y)
。关于这个话题，WPS官方版本下载提供了深入分析
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Wallace was taking legal action against the BBC and BBC Studios after being sacked from the cooking show in July.