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If you understand a concept, then you can reason its big O. Memorization implies a superficial understanding that may be revealed later.

Interestingly enough this works both ways. To say more accurately, memorization MAY imply superficial understanding. Memorization (and associated intuitive pattern-matching) may also lead to understanding.

A cheat sheet like this is also good shortcut refreshing one's memory of the concepts if this knowledge is not used on a regular basis.

I agree, our brains are good at recognizing patterns. So some amount of rote memorization of data can help us see these patterns.

I remember learning the 9 * table as a child and suddenly realizing that n * 9 = (n * 10) - n , thinking "hmm, does n * x = n * (x + 1) - n" why yes it does!


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