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GFG article with interesting time complexity (merging std::set in O(1))
Some newbie messaged me with asking for help on this article https://www.geeksforgeeks.org/queries-for-number-of-distinct-elements-in-a-subarray-set-2/.
Can someone explain why time complexity is O(log n) and not O(n)?
Please read it once before downvoting. It is an advanced data structure, that is not well known.
