Hi all,

First off, apologize if it's not the right place to ask this question. How do you guys make sure that you don't forget the solutions or the approaches that you have already solved previously? Obviously, I don't think memorizing the solution is the way to go for algo questions - since it's rare we will be asked for the exact same question.

I found myself run into this problem quite often. Lets say I have solved a problem about Diameter of Binary Tree couple weeks ago. Now, I come across that problem again and I forget about it.

Thanks for all the input guys!