Hi Codeforces! I just started CP from a math competition background in September (?) but only started CF recently and I have been using Java. Would it be a good idea to learn C++? Java has been mostly fine for me at the lower levels, but now that I'm starting to get more experience it might be a good idea to switch over.

Also, do you put your solutions all in one file or a separate file for each solution? I'm currently having them all in separate files but I have to copy over extra functions every time. I'm starting to think one file would be better, but I wanted to hear what other (and probably more experienced) participants think.