Auto Submission during the Test time-out

You typed the code, but never submitted or compiled it, i.e., never clicked Run Code or Submit 

HackerRank will submit the last version of the typed code if the Test times out.

You typed the code and clicked on the Submit button. After submitting, if you updated/tweaked the code but never re-submitted or compiled it again:

HackerRank will submit the previously submitted code (not the tweaked code) if the Test times out and gets closed automatically.

You typed the code and clicked on the Run Code button. However, you didn’t click on the Submit button.

HackerRank will submit the latest compiled version.