Hi everyone! We are thrilled to invite you to The 3rd Universal Cup, Stage 38: Guangzhou, taking place on May 24th, 2025.

The contest is based on the Finals of the CCPC (China Collegiate Programming Contest), which was held on May 11th, 2025. This is my third time to be a judge on the CCPC Finals, and probably my last experience of my judging experience in high school.

This problem set is prepared by Gellyfish, JohnVictor, EvenImage, Kevin114514, Kubic, Lynkcat, Milmon, ODT, zhoukangyang, Qingyu.

Finally, as a personal note, this contest is the last show of the team Rainow (CF and UCup). I was supposed to enroll in Peking University as an undergraduate in the fall of 2024, and this team that was born during the ICPC World Finals Luxor. However, due to some silly policy reasons and problems arising from within CCF, I ended up losing the opportunity to enroll in Peking University as part of the national training team. As a result, this team did not make it to the ICPC/CCPC tournament by any chance due to the problems I had. I wrote more stories (without any spoilers on the problem set) on Zhihu in Chinese, and I will post an English version on my personal blog after the contest.