Be aware that the stack space here can become huge for bigints. It's a better practice to use tail recursion for constant stack space.

Offtopic, but: why do you copy other users' solutions? Or is this your second account?

really 🤣🤣🤣

• There is 1 word that starts with o -> {"o": ["only"]} -> 1 letter prefix, 1 word -> 1 = 1 -> OK
• There are 2 words that start with a -> {"a": ["are","answers]} -> 1 letter prefix, 2 words -> 1 < 2 -> we will add more letters to make subdivisions
• There is 1 word that starts with ar -> {"ar": ["are"]} -> 2 letters prefix, 1 word -> 2 > 1 -> Not OK
• There is 1 word that starts with an -> {"an": ["answers"]} -> 2 letters prefix, 1 word -> 2 > 1 -> Not OK
• There are 2 words that start with s -> {"s": ["some","solutions]} -> 1 letter prefix, 2 words -> 1 < 2 -> we will add more letters to make subdivisions
• There are 2 words that start with so -> {"so": ["some","solutions]} -> 2 letter prefix, 2 words -> 2 = 2 -> OK
• we take all the OK's in one final sorted array -> ["only", "solutions", "some"]
• Mic drop!

only -> beginning = o (1 letter, 1 word) OK \\\ Why 'o'? Its only one word here wtf??

are -> beginning = ar (2 letters, 1 word) not OK \\\ Why 'ar'? Its only one word here wtf??

answers -> beginning = an (2 letters, 1 word) not OK \\\ Why 'an'? Its only one word here wtf??

Whats the logic here? Why dont author explain this in the description..

thanks

Because of the the ascii values of 'l'(108) and 'm'(109). If you sort a list with these strings it will arrange words that start with the same characters by the next. In "solutions" and "some" - 's' and 'o' have the same value, it's the following characters that make the difference.

Why the ouput ["only", "solutions", "some"] insted of ["only","some","solutions"].The test: "only some solutions are answers"

ONLY if their group size (or array length) is equal to the number of shared letters in each beginning

• solutions, some -> beginning = so (2 letters, 2 words) OK
• only -> beginning = o (1 letter, 1 word) OK
• are -> beginning = ar (2 letters, 1 word) not OK
• answers -> beginning = an (2 letters, 1 word) not OK

Why the output is
["only", "solutions", "some"] instead of ["solutions', "some"]
The test:
"only some solutions are answers"

Descriptions says: Group them by their beginning!

Thank you for the remport, I change the ref solution (it was very slow endeed). Now it shouldn't timeout.

Python: The reference solution is really slow. If I run it against itself, I get a timeout. I don't think the ref solution should timeout.

I fixed the description. Thank you for the report

The description says to return an empty list if any cases match, I assume you meant if none of them match?