LeetCode classifies each of its problems as Easy, Medium, or Hard. This leads to discussions among users about how many of which types of problems to practice. Since even easy problems appear in interviews, it’s important to have a strategy for problems at all difficulty levels:
I can solve some of the medium problems that I attend to, in LeetCode and can never solve the hard ones. Do I have to study more to ace the Google interview until I can solve the hard ones or do I have a chance currently? (answer)
I’m doing most of my writing on Quora this year. For more information, see A Project for 2020.