Thanks for the response! I appreciate your concern about posting code online. I’m going to respectfully disagree. At least in the case of the archived problems.
Project Euler problems are a great thing to add to a portfolio. I can’t control whether other people look up my solutions to the problems, but I know I don’t look for solutions online when solving the problems myself.
Totally agree that not having access to the answers is important. You SHOULD struggle when trying to solve the Project Euler problems.