[LnxPrgr3]

For functional purposes, I consider myself to know something if I could page in the details well enough to implement it in 5 minutes with Wikipedia or less.

How this plays in interviews is interesting for just how inconsistent it is. Sometimes I win the algorithm lottery and have had reason to implement the obvious solution myself at least once, and the interviewer learns my memory works. Sometimes I don't know what they're going for but come up with a reasonable answer anyway and the interviewer is thrilled I managed to have an independent thought. Sometimes I lose and the interviewer is clearly trying to guide me to the answer they want to see and I have no idea what they're getting at.

Though not quite as bad as a friend failing an interview for not using a hash table, even though the answer he described was a hash table—just with the identity function as the hash.

(Though maybe about as absurd as one interviewer digging for any formal training I might have had in C++. Like you can teach that language in a semester—please. There are maybe 4 proper experts on the planet.)