User login [Brazil Training Camp 2026. Day 5]

Note that:

Your solutions are running under Linux, so take into account that any compiler-dependent features that work, for ex., under MSVC, may not work under the different OS and compiler.
To check actual limitations (Time Limit, Memory Limit, Source Limit etc) use Summary tab.
You may download all samples and attachements from the contest tasks using Attachments tab.
The Run On The Samples feature runs the solution only on samples. It does not affects the standings. If all samples are passed, you get Accepted for testing verdict.