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* 新增当日价格，并返回该价格的跨度
。关于这个话题，im钱包官方下载提供了深入分析
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Last year, we saw savings across all of Amazon's device lineups: Echo, Fire TV, eero, and Kindle. In fact, the Kindle Colorsoft saw its first-ever sale last year. But will this sale beat Amazon's Black Friday pricing? That's still to be seen.
// 易错点5：必须将当前元素入栈（作为左侧元素的候选更大值，漏写则栈始终为空）