Can confirm. I started messing with leetcode and brushing up on some algorithm stuff lately. It's been about 4-5 years since I took an algorithm class and I've lost nearly all of my knowledge because it's just not something used in the kind of programming I do. I do feel myself regaining those skills, but I don't know if having a degree is exactly the reason why I am regaining those skills, because it has still been difficult reacclimating myself.