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。
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，这一点在爱思助手下载最新版本中也有详细论述
Nature, Published online: 24 February 2026; doi:10.1038/d41586-026-00592-y
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pending = combined.slice(start);