Comment by strikelaserclaw

in my experience, easy problems basically test how well u know the language u code in, they generally involve no knowledge of algorithms or ds. Medium problems generally involve being comfortable applying algo & ds fundamentals to solving problems. Generally, u can solve a medium problem pretty easily in a bad way but u can refine it to whatever degree your skill permits you, they key here is to understand things like space time complexity of your solution and seeing if you can refine it