CodeRishi37/leet-code-tracker ? reverse-engineered prompt

Build me a simple Java console app for tracking LeetCode style problems. I want to be able to add a problem with its number, name, topic, and difficulty, then update its status to completed, attempted, or given up. It should let me delete entries, search by problem number, topic, name, difficulty, or whether it is solved or unsolved, and show all saved problems in a few different views.

I also want a stats screen that shows how many problems I have total, how many are solved versus unsolved, my solving percentage, and a breakdown by difficulty. Please make the data save permanently to a local file so it loads again when I reopen the app. Keep it clean and easy to use from the terminal, and if you need to look up anything current in the docs, feel free to do that.