Describe the bug

When I try to swap lines with the command that CP Editor has configured in macOS (Command+Shift+(Up or Down Arrow)) it doesn't work, because in macOS, the shortcut Command+Up Arrow for example when used in text, moves the cursor from the current cursor position to the beginning, and Command+Down to the end

So when you also use Shift, what you get is that you select

Code one that runs in proportion to R instead of R and N (i.e. N should be able to be arbitrarily large)

See cpinitiative/usaco-guide#1087

When icpc/ccs-specs#38 is merged, we no longer need the scoreboard.tsv export. We can replace it with something that internally gets the scoreboard API endpoint and downloads it as JSON.

...so admins know which issues still need to be addressed

We sometimes want to run tests which are not associated to specific problems (e.g. generating inputs using srand() and rand(), and check the output with assert()). For this, we can use Hello World as a dummy problem.
However, this technique is not trivial, so we should print hint messages when test files with no PROBLEM