Hello, Codeforces community

I need your advice on how to get the logic from the code. Since most of the time, we first given the logic and then introduced it to the code. But here, many times, I face issues on understanding editorials; hence try to do a dry run of the code either from successful submissions or from the editorial. But some codes use such a large number that I can't do a dry run. Hence, seeking help for the same. I also appreciate it if someone shares their experiences about how they build the logic for a problem.

I really appreciate any help you can provide.