SOJ
https://www.spoj.com/
littlehb 
mdcija780522

10402852@qq.com


POJ 北京大学
http://poj.org/problem?id=3694
littlehb
mdcija780522


HDU 杭电
http://acm.hdu.edu.cn/showproblem.php?pid=4738
littlehb
DsideaL4r5t6y7u!@#

牛客网
https://ac.nowcoder.com/
以QQ进行的第三方登录

LibreOJ
https://loj.ac/
littlehb
mdcija780522

Lightoj
https://lightoj.com/home
10402852@qq.com
mdcija780522


http://uoj.ac
littlehb
mdcija780522


HDU图论题单
https://www.lmlphp.com/user/63129/article/item/825766/