I guess it's because it depends on your current rank, you can find something about that in the docs.

I wouldn't say much easier. For some languages, I agree with you, one additional optimisation step is required to avoid timing out.

Thanks!

Do less work instead of working faster
Solving some cases manually may tell you a thing or two about what work needs to be carried out and what doesn't

Thanks!

Thanks!

Thanks!

да, тоже хотелось бы знать