Project Euler has exactly what you’re asking for. The catch is that you have to solve the problem first before seeing the list of selected solutions. Once you i

Project Euler has exactly what you’re asking for. The catch is that you have to solve the problem first before seeing the list of selected solutions. Once you input the right answer, the solutions there are limited to solutions that have been upvoted, and recent solutions. The recent solutions disappear as new ones arrive, but the upvoted ones stick around. This is a fabulous way to learn new tricks and insights, as long as you’re up for sticking with it. Solving the problems does force you to be invested, and it’s great to see how much better/faster/smaller/smarter some other people’s solutions are once you’ve had to come up with your own way.