https://lambda-xmu.club/2019/09/16/%E5%BE%AE%E5%8D%9A-%E5%A4%B4%E6%9D%A1-%E6%8A%96%E9%9F%B3%E7%83%AD%E6%90%9C%E6%AF%94%E8%BE%83/ Data Competition
