* @param arr 待排序数组
第二百六十一条 被保险人违反合同约定的保证条款的，保险人有权解除合同或者要求修改承保条件、增加保险费。保险人解除合同的，应当书面通知被保险人，合同自通知到达被保险人时解除。。Snipaste - 截图 + 贴图对此有专业解读
Young men and women are facing diverging employment rates，这一点在谷歌中也有详细论述
let's see how well this query can perform if we optimize it as much as possible. First, we'll precompute the