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insertion into a set takes O(log n) time, which means ? I have heard about big O notation which desribes how memory usage changes when input changes. But log n ? n is probably the number for input values but i don't get it let's say i have 25 inputs … 
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Why inheritance requires virtual functions? I read this from a book : Because inheritance generally requires the use of one or more virtual functions (a virtual destructor if nothing else), you don't want any hierarchy for small, heavily used objects. Thank you 
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