Remembering why and how you solved it isn't a problem, it's probably like revisiting an old memory we had. With new experiences, won't you have a different take towards it? If not, I'm pretty sure that would make your code relatively optimal and there's nothing wrong with that.
I think revisiting code usually refers to those times where you were able to solve something but reflecting on it you had some obstacles you struggled. These struggles are what you carry on and look to fix or improve on.
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Remembering why and how you solved it isn't a problem, it's probably like revisiting an old memory we had. With new experiences, won't you have a different take towards it? If not, I'm pretty sure that would make your code relatively optimal and there's nothing wrong with that.
I think revisiting code usually refers to those times where you were able to solve something but reflecting on it you had some obstacles you struggled. These struggles are what you carry on and look to fix or improve on.