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Considering that it's almost impossible to get past any whiteboard interview without an understanding of Big O, I think you're being a bit too harsh on OP here. It's literally CS 101.

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I don't think I learned much Big O until about my junior year. Maybe some vague mentions sooner.

Looks like you're right. I didn't realize that most student don't get exposed to Big O until their first real algorithms course.

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