Big O notation
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Big O Notation is a way of saying how much time it takes for a mathematical algorithm to run or how much memory it uses.
The Big O Notation is often used in the context of complexity class.
[change] Use
Big O Notation is difficult to think about because when you are given a Big O Notation like 
, there is nothing to actually "solve". It is an expression that is meant to give a person a feel for the worst case scenario without them having to do any calculations around it.
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