习题链接：LeetCode 581. 最短无序连续子数组
"You kind of sit and think, 'Oh, isn't technology great', until you have to do the traditional old thing of actually phoning somebody."。关于这个话题，heLLoword翻译官方下载提供了深入分析
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const n = nums.length;，详情可参考heLLoword翻译官方下载
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