Not necessarily. Leetcode problems go from “just iterate over the collection collecting some data as you go” to “Knuth solved this once and thankfully he wrote

Not necessarily. Leetcode problems go from “just iterate over the collection collecting some data as you go” to “Knuth solved this once and thankfully he wrote it down in a book for us mortals”. Maybe part of the problem with these threads is that posters don’t clarify exactly what they’re complaining about.