I have written solution for problem 1401 and got strange "Time limit exceeded" on test 12 with solution time just 0.14 s while the problem has time limit 2.0 s.

I investigated the problem and found that when I write answer in 1024 bytes chunks I can write up to 1046528 bytes which is 1 MiB without 2 KiB.

I suggest admins to check configuration of C# environment and allow C# programs to output enough to solve any problem. I guess that this limitation may be connected to the fact that the site itself uses .NET and maybe found behaviour is used to limit page sizes.