Each problem has a lot of solutions, and many of them are correct. One should not expect that every problem has a single correct solution; there are better solutions, there are worse solutions, but there are almost always two or three significantly different solutions, which are all very good, and it is difficult to choose the best one. Be prepared for this, be prepared to see these different solutions and different approaches.

In particular, if you have a bug in the program, then there are usually many ways to fix it. Therefore, do not be surprised if you ask me how to fix the error, and I offer you several ways to fix it.