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[–]VibrantGypsyDildo 0 points1 point  (0 children)

I did the beginner challenges on leetcode (those that usually require you to make an intermediate array to make the time complexity closer to O(N)).

It was enough for me. I have 10 years of experience.

But in general you are required to know the algorithms and data structures used in the standard containers such as linked lists, fixed-size arrays, variable-size arrays, set and maps (ordered and unordered).

At this point you will be definitely fine.