I guess this really depends on how complicated the problem really is and can you really know everything before you code. I have very limited memory, so I often

I guess this really depends on how complicated the problem really is and can you really know everything before you code. I have very limited memory, so I often write out pseudocode/notes about some properties to help my reasoning. For some problems, I will write scripts to try out some idea, verify my assumptions, while thinking about the problem.