How to compare two document folders?

Question

Windows

There are 2 folders. The second folder is essentially a sorting of files from the original folder, that is, the files there are the same. I remember exactly that I didn’t delete anything, I just sorted the files (mostly text and folders) for convenience. As a result, the explorer shows that there are 2 more files in the original folder. How / with what software to find out which files were lost during sorting? I will not be able to calm down until I find out what these 2 files are.
PS - there are more than 10000 files.

Answer 1

You can easily find 2 files if there is enough space for a third copy. Copy everything sorted into one new folder. Compare stupidly 1st folder with the 3rd. It is convenient to do this in the FAR manager, but you can also do it with your bare hands using the dichotomy method. If we assume that at the last step one of the 16 files can be easily found visually, then 10 comparisons will be enough to find 1 lost among 16384 files. Two lost - for 20 comparisons, only using hands and eyes, no utilities, no scripting.