This editorial corresponds to 2018 Chinese Multi-University Training, BeihangU Contest (stage 5), which was held on Aug 6th, 2018. Moreover, this problem set was also used as Jingzhe Tang Contest 1 in Petrozavodsk Winter Camp on Jan 30th, 2019.

This post will try to elaborate on notes, solutions and maybe some data generating. Before that finishes, you can refer to an old published material.