描述：找出一个连续子数组，若对该子数组升序排序，则整个数组变为升序。返回符合题意的最短子数组长度。
// 步骤3：从后往前遍历数组（反向遍历更易理解，每个元素只入栈/出栈一次），更多细节参见Line官方版本下载
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"The beverage industry is actually a system of small, independent businesses, some of which have been in the same families for generations," a spokesman for the American Beverage Association tells the BBC. "Many produce brands that have been around for more than 100 years."，推荐阅读体育直播获取更多信息
"Shame on @deoncole and all those in the audience who laughed at his vile 'jokes'."
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