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* @param arr 待排序数组。同城约会对此有专业解读
。关于这个话题，safew官方版本下载提供了深入分析
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if (right - left <= 1) return; // 只有一个元素，无需排序。谷歌浏览器【最新下载地址】是该领域的重要参考