Has anyone here participated in the IOI or another international programming olympiad?

Hi everyone!

Has anyone here participated in the IOI or another international programming olympiad?What books, websites, or courses helped you the most?I already know Python at an advanced level, but I'm only a beginner in C++. My family is struggling with loans and debt. During my summer vacation, I work night shifts to help my parents pay them off. My biggest dream is to become good enough to win a medal at IOI, build a career in programming, and eventually free my parents from debt.That's why I want to use every hour I have as effectively as possible. If you've been through this journey, I'd be very grateful for any advice or resources that helped you.