每日一证 5.20

Posted on 2019-05-20 | In ACM , math

欧拉函数性质

$n = \sum_{d|n}{\phi(n)}$

HDU5242

Posted on 2019-05-19 | In ACM , HDU

树上贪心

Posted on 2019-05-19 | In ACM , codeforces

4/5

Posted on 2019-05-18 | In ACM , codeforces

5/6

Posted on 2019-05-05 | In ACM , codeforces , gym

7/12

Posted on 2019-05-04 | In ACM , ZOJ , Team

8/11(13)

组队训练

Posted on 2019-04-14 | In ACM

8easy
怎么还有一个easy都不会啊

Posted on 2019-04-14 | In ACM , Codeforces

沙雕场
我杀我自己

Posted on 2019-04-08 | In ACM , Codeforces

Difficulty: 1800 ～ 2200

Posted on 2019-04-04 | In ACM , Codeforces

Done
F solution2