algorithm - Time complexity of an+b = O(n^2)? -

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I am reading "Introduction to Algorithms" and stuck on Chapter 3, where the authors say "What's more surprising It may be possible that when someone> 0, there is a linear function in a + b o (n ^ 2) "Can anyone prove to prove this?

A linear function is a + b O (n ^ 2) By definition: Enough large N , a + b cn ^ 2 , for example C = 1 .

Note that O (n ^ 2) is upper bound, but not tight


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