int pivotIdx = partition(arr, low, high); // 分区并获取pivot位置
另据 ChinaEV Home 消息，其公布了一组疑似小米未发布的全新超级跑车车型的谍照图。
，这一点在51吃瓜中也有详细论述
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swap(&arr[i], &arr[minIdx]);