Hi, can you explain me how it work xd? Im newbie :(

bruh, why didn't I think of that.

Why did you use this '^(' ')+$' in regexp?

Not very performant, though.

I'm also

Now I hate myself.

GENIUZZZ

You don't have to declare the type of read s, as it is given by the function type signature.

?= is a lookahead assertion. It checks for the match (with any uppercase letter in this case: [A-Z]) but doesn't include it in the match.

Can somebody explain this /(?=[A-Z])/?

Doesn't seem to have a check for strings with length <= 4.

Best solution IMHO.

Each time I create a chain list with a loop and you a to find the loop's size

You should be able to click "View Solution" right below my comment.