After spending a lot of time interviewing candidates. I have pretty much come to the conclusion that DP problems dont give good signals about candidates problem solving skills. In my experience, less 5% of candidates can genuinely crack problems using DP. Most of them either give me memorized solution or just plain give up.

If you are interviewing for a regular CRUD job aka web application. There are soo many other problems which can give much more refined signal about candidates skill. Please for love of God, dont ask DP. Unless you actually use it at work.