I think that is the whole point of not giving answers. You should be able to solve a problem in multiple ways and prove correctness. It takes loads of time, b

I think that is the whole point of not giving answers. You should be able to solve a problem in multiple ways and prove correctness. It takes loads of time, but that is the only way to truly learn. Most of students given answers will solve a problem in one way see that answer matches the correct solution and stop there. That is not the way to learn anything. It is the same with software, it takes a lot of time to get good at. In software it is easy to get correct solution with wrong approach, but often people just stop at "make it work" where they should step back and "make it work, make it right, make it fast".