注意要开$long long$

xiangling @ 2018-10-28 17:12:36

by codesonic @ 2018-10-28 17:18:51

为啥我没开ll过了

by saipubw @ 2019-04-20 01:08:30

实测不需要ll

by saipubw @ 2019-04-20 01:08:49

https://www.luogu.org/recordnew/show/18365359