// 从右找第一个小于pivot的
Rory Amon, 36, began his evidence in his New South Wales supreme court trial after pleading not guilty to 10 charges for various sexual acts against the young teen in 2017.
，详情可参考heLLoword翻译官方下载
优点：计算简单，导数恒为1（正区间），缓解梯度消失
Personal dictionary
第八十五条 引诱、教唆、欺骗或者强迫他人吸食、注射毒品的，处十日以上十五日以下拘留，并处一千元以上五千元以下罚款。