Hello, Codeforces!
We are happy to invite you to the VII UnBalloon Contest Mirror on May/17/2026 20:00 (Moscow time) . UnBalloon is the competitive programming community of University of Brasília.
This contest is a Codeforces Gym, and therefore is NOT an official Codeforces Round and is NOT rated. The contest will follow standard ICPC rules.
The problems were created and prepared by:
- Alberto Neto (AlbertoTDNeto)
- Arthur Botelho (me)
- Eduardo Freire (duduFreire)
- Eduardo Quirino (cebolinha)
- Lucas Sala (lucassala)
- Pedro Gallo (PedroGallo)
- Ruan Petrus (MagePetrus)
- Wilson Guimarães (Vilsu)
We would like to thank:
- DOM Judge team for the platform used in the on-site contest;
- dario2994 for the brilliant pol2dom tool;
- MikeMirzayanov for the amazing Codeforces and Polygon platforms.
- Maxwell Oliveira (Maxwell01) and Gustavo Leal (gustavoleal) for the on-site support;
- Professor Daniel Porto (dporto) for the help in the contest organization and all other UnBalloon activities.
Most of the problems are aimed at those who are starting their journey in competitive programming. However, we also included a few problems we believe will be an interesting challenge for more experienced participants, such as finalists of ICPC Regionals.
Good luck to all participants!
Note: if you participated in the on-site contest, please don't make any comments regarding the problems in this blog. As soon as the Mirror finishes, we will publish an editorial blog — you may discuss the problems there.
