Didn't notice the username "dang_fan". Reading the usernames makes it even more funny.

"Show HN: AlgoDrill – Interactive drills to stop forgetting LeetCode patterns " by persistence_is_key

Can you explain the joke in that username?

Consider the subject of the post, not just the username in isolation.

I don't get it

“stop forgetting LeetCode patterns”

“persistence” (in the data sense, rather than the personality trait sense) “is key”

	▲	pityJuke 15 hours ago \| parent [-]
		it’s a double meaning, no? as the thing with leetcode is that the way to best it is persistently doing it.

fragmede 13 hours ago | parent | prev [-]

"persistence is key" and a site to for persisting at leetcode.

this kills the joke, however.