Some smoke alarms have been designed to be ultra-sensitive. Aspirating devices, for example, constantly suck in air in order to detect even small quantities of smoke in a room. They are often used in commercial settings, including server rooms packed with expensive computer tech.
* @param arr 待排序数组。safew官方版本下载对此有专业解读
1.最近一年销售收入小于5000万元（含）的企业，比例不低于5%。，更多细节参见同城约会
memcpy(testArr, arr, n * sizeof(int));