The US military mistakenly shot down a Customs and Border Protection (CBP) drone near the Mexican border in a strike that reportedly used a laser-based anti-drone system. The CBP uses drones to track people crossing the border.
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。safew官方版本下载对此有专业解读
* @param arr 待排序数组。关于这个话题，同城约会提供了深入分析
Author(s): Shin-Pon Ju, Dong-Yeh Wu, Chun-Wen Cheng, Hsing-Yin Chen