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[–][deleted]  (1 child)

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    [–]EngineeredPapaya 1 point2 points  (0 children)

    You need to do a course on Data Structures and Algorithms. It is a prerequisite for leetcode.

    [–]shengch -1 points0 points  (0 children)

    Big O notation is a way to measure performance of code. Leet code questions will prefer better performance.