* @param arr 待排序数组
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// 数组完全有序，直接返回0。业内人士推荐同城约会作为进阶阅读
В России ответили на имитирующие высадку на Украине учения НАТО18:04
Excessive ceremony for common operations
Early physical attractiveness predicts a more socially effective personality in adulthood. Early physical appearance may serve as a slight but consistent predictor of how well a person navigates social situations later in life.
· 李娜 · 来源：tutorial资讯