Hi guys.\n\nLately I\'m feeling that the difficulty of leet code problems are not rated fairly.\n\nI see some hard problems that are not that difficult, but I see some medium problems that are just unsolvable. Same goes to easy vs. medium.\n\nFor example, inorder/preorder to binary tree was really difficult in my opinion. Even after looking at the solution, I still can\'t wrap my head around with it.\n\nWhat do you guys think?

Hi guys.\n\nLately I\'m feeling that the difficulty of leet code problems are not rated fairly.\n\nI see some hard problems that are not that difficult, but I s