康托尔！
by int32 @ 2021-04-30 20:51:08
同情
by Baiwhiter @ 2021-04-30 20:55:35
用了```std::ios::sync_with_stdio(false)```就不能再用scanf了，换成cin就可以了。
by 周锦瑜 @ 2021-07-28 17:00:06