Leetcode is ok. My issue with it is some of the prompts are kind of confusing. Some of the solutions are often crowd sourced. Someone will probably post a so

Leetcode is ok. My issue with it is some of the prompts are kind of confusing. Some of the solutions are often crowd sourced. Someone will probably post a solution in your language of choice, but there's not always a good explanation. I much prefer the book Elements of Programming Interviews. It has an accompanying git repo with tests that you can debug in if you really need to. The solutions usually discuss a couple possible approaches. Following their study guide, I learned about Java data structures that I don't normally use and saw a good variety of problems. Ended up getting a job I was shooting for. Ultimately though, it's not so different from leet code, although I think it is a more effective use of time. I think it is a good idea to do some practice just so you are ready for this type of question.