https://www.cnblogs.com/0xiaoyu/p/12849760.html
https://www.cnblogs.com/0xiaoyu/p/12846839.html
略
https://www.cnblogs.com/0xiaoyu/p/12846858.html
Benelux Algorithm Programming Contest (BAPC) 2015
原文：https://www.cnblogs.com/0xiaoyu/p/12852957.html
