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They are the types of questions asked by FAANG and the wannabes (cargo cult style) for many years now. There's a site (and other resources) collecting those kinds of problems. They're mostly uninteresting and any CS graduate with a solid data structures and algorithms background (as in the 1xx and probably 3xx level courses, usually 2-3 total over a CS degree) should be able to figure them out if given time. But they aren't given time or they don't have that background or they putzed around in school instead of studying, so people memorize the answers instead for a large number of problems ("grinding") and hope that what they studied are the ones asked.

Leetcode is essentially what a Comp Sci student learns in their 2nd year Algorithms course. There are a few more esoteric algorithms that don't get covered in college and but 90% is stuff I remember from college.

innocent little lamb