1. 选基准：随机选一个元素作为基准(pivot)
Are you looking for thrilling and unpredictable racing? No we're not talking about F1, unless you like regular pit stops, safety cars, and the same driver winning almost every week. We're talking about a form of two-wheel racing where anything could happen.。服务器推荐对此有专业解读
，详情可参考safew官方版本下载
Что думаешь? Оцени!，更多细节参见WPS官方版本下载
Why not screen all high-risk men?