Hi Codeforces! I am proud to invite you to the online mirror of 2025 Taiwan NHSPC Mock Contest!

The National High School Programming Contest (NHSPC) is an official informatics contest from Taiwan, where the top ten students enter the spring training camp, in which the IOI participants are selected. The NHSPC Mock Contest is a contest prepared by former OI participants from Taiwan, and helps contestants prepare for the official NHSPC which takes place the following week. This year, just like 2024, 2023, 2022, and 2020, we have decided to hold an online mirror on Codeforces, so people around the world can participate.

The mirror on Codeforces Gym takes place on Sunday, December 7, 2025 at 09:00UTC+8, and will last for 5 hours. The scoring is in IOI format, there will be 7-10 problems, each of which has a maximum score of 100 points. There will be subtasks of varying difficulty in each problem, and we hope that the problems will be interesting for contestants at all rating levels. The problem statements will be in English and (Traditional) Chinese.

I would like to thank our team for making this contest possible: becaido, Darren0724, GrandTiger1729, PsychoPinkQ, prairie2022, qwe1rt1yuiop1, hengliao, LittleOrange666, CYhuang, daniel071292, owoovo, Pacybwoah, phoenix0423, PCC, the_coding_pooh, willychan, 110026, pring, dnnnda

We suggest reading all problem statements and we hope you'll enjoy the contest!

Update: Congratulations to Brinton for winning the official contest, and dreamoon_love_AA for winning the mirrored contest!

Editorial is available here (Traditional Chinese).