User login [Techarena Training Camp HSE Day 3: Yoeng-Jin Chu, First Division]

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.