I'm certainly not the only one wondering why you don't use "using namespace std;"

answer me jiangly!

Is it still relevant for div2 in 2024?

Has anyone ever done this?

Every single div1 people that I know IRL or online had coach.

so I think it's extremely hard to improve and get into div1 without proper guidance from coaching.

but I have no affiliation, coaching will not available but still I want to improve, so asking help from people who actually become div1 without coaching.

Clearly, there are certain features in Codeforces that seem to have access limits (opened for 2100+) that are not officially disclosed.

However, here is the list of features that only Div.1 people can use from my observation.

1. Streams — div1 people can advertise their streaming.

2. Uphack — div1 people can hack solution after system test.

3. Problem tag — div1 people can edit problem tags and possibly determine problem rating.

4. Catalog — div1 people can edit catalog.

5. Vote — div1 people vote weighted more than other.

Feel free to share if there is anything not mentioned here; there are probably a lot more.