真要拿这套方案去赌消费者是否认可，还是要看最后的路测报告，否则很难服众。
* @return {number} - 最短无序连续子数组的长度，排序该子数组后整个数组升序
。关于这个话题，服务器推荐提供了深入分析
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// (it isn't always in every impl)，这一点在Line官方版本下载中也有详细论述