Maybe it’s a work computer and it’s not their choice.

Than complain to IT, not to me.

Maybe they’re not a computer toucher and do not have confidence touching computers.

When someone tells you to install Linux and reply that you don’t know how, they’re often willing to help.

Maybe they were perfectly happy using these OSs before some stupid new feature was introduced.

That is a perfect reason why they didn’t have to use Linux, but do have to use it now.

Maybe they’re tired or stressed or have no time.

In that case, they’re probably not a gamer, which is the best reason not to switch to Linux. Also, when you buy a new computer, it is probably faster and less stressful to install Linux, than Windows 11 (assuming you want a usable win11, with most spyware disabled).

I’m not too good with java, but it should be something like this:

public static int convertRomanNumeral(string n){Map.of("M","DD","CD","CCCC","D","CCCCC","C","LL","XL","XXXX","L","XXXXX","X","VV","IV","IIII","V","IIIII");.forEach((k,v)->{n=n.replace(k,v);});return n.length();}

Since Roman numerals have an upper bound, the time complexity is always O(1).