We need to improve the comments explaining the main ideas / insights of the solution

Should check if problem_dirs is a string before https://github.com/DMOJ/judge-server/blob/master/dmoj/judgeenv.py#L173, otherwise we will be watching nonsense paths,

It would be great to add a subset of the now only jury available stats also to the team and public pages.

I'm thinking of the submission graph over time (but all rejected verdicts bundled into one, of course nothing after the freeze) and the total number of attempts/corrects.

As you can see here, half of download_history.py is not covered by unittests.
At least, I want to test DownloadHistory.get fucntion.

We can test this module by 3 steps.

• Clear utils.cache_dir / 'download-history.jsonl'.
• Execute oj d, or directly instanciate DownloadHistory and

There are two sets of refactoring that can be performed on our codebase to make them more efficient and utilize the full potential offered by Qt Framework. See below:

1. There is no need to explicitly call delete on widgets that are allocated on Heap as long as in their constructor we have specified the parent widget for it. Consider this example below:

class Widget: public QObject