Последние новости
int key = arr[i]; // 待插入的元素
，推荐阅读safew官方版本下载获取更多信息
* 时间复杂度：O(n)，空间复杂度：O(1)。搜狗输入法2026对此有专业解读
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// 测试函数：验证排序正确性