描述：prices[i] 为第 i 件商品价格。第 i 件商品可获得折扣 prices[j]，其中 j 是满足 j i 且 prices[j] <= prices[i] 的最小下标；若无则无折扣。返回每件商品折扣后的最终价格。
Backpressure — the ability for a slow consumer to signal a fast producer to slow down — is a first-class concept in Web streams. In theory. In practice, the model has some serious flaws.
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官方通报烤全羊「36 斤变 6.9 斤」调查结果：商家退一赔三，推荐阅读WPS官方版本下载获取更多信息
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Staying hands-on and problem solving in real time