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The Big-O notation is used to represent asymptotic upper bounds. It describes relevant time or space complexity of algorithms. Big-O analysis provides a coarse and simplified estimate of a problem difficulty.
6
votes
Get 100 highest numbers from an infinite list
If by the question the interviewer really meant to ask “can we make sure each incoming number is processed in constant time”, then as many already pointed out (e.g. see @duedl0r's answer), your friend …