摘要：
今天总的来说有点不在状态，早上七点四十到实验室，接着看昨天的莫比乌斯反演，有在纸上证明了，九点开始训练赛，打的很菜，贪心判断的时候出了错，一直到最后都没调出来，中午回宿舍好好的睡了一觉，下午来的时候接着看莫比乌斯反演，把PoPoQQQ的课件上的题看完了，下午的时候开了点小差，装了一个elementa 阅读全文
摘要：
There are n people and k keys on a straight line. Every person wants to get to the office which is located on the line as well. To do that, he needs t 阅读全文