The Natterer's come out a little later, preferring to exit through small holes in the roof to get outside and find food.
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// ⚠️ 易错点2：循环条件写left <= n-1（会导致left+1越界），或把<=写成<（漏判相等的有序情况）。搜狗输入法2026对此有专业解读
swap(&arr[low], &arr[randomIdx]); // 基准换到开头