still took me some time to understand the correct order of events :)

I was also mislead by the description of the last example, where it says "the possible result contains negative number". It would be less confusing if it said "the possible result contains a number that is not positive".

I just fixed that specific error and now the author's solution passes again.
But I didn't dig deep enough into the anti-cheating code to be confident that I fixed everything.

You should not be throwing an Error, you should be returning undefined.

ok

fixed

you can work thu this like so

1. !! is shorter than a 5-character chunk, so it must be padded with u chars
2. decode !!uuu
3. convert to bytes: [33, 33, 117, 117, 117]
4. subtract 33 from each byte: [0, 0, 84, 84, 84]
5. create 32-bit integer: (0 * 85**4) + (0 * 85**3) + (84 * 85**2) + (84 * 85**1) + (84 * 85**0) = 614124
6. break the 32-bit integer up into 4 bytes (this is an exercise for you). you will get: [0, 9, 94, 236]
7. because 3 u were added to the padding, drop 3 bytes from your result: [0, 9, 94, 236] becomes [0]
8. encode [0] as ascii string: '\0' or '\x00' or '\u0000' – each are equivalent

answer: <~!!~> decodes to a string with a single null byte: '\0'

Yep. Thank you. Fixed now.

I modify the description add some text like above ;-)

the lucky man in first round is always the first man(element 0).
The process of game is:

 +----->  lucky man send $100 
 |  --->  each man grab once[12, 23,34,45,...]  
 |  --->  elect a new lucky man from their grabed money[12, 23,34,45,...]
 +--------start a new round  

Anyway, thanks for your test, solve and feedback ;-)

Sorry, but where is saying 0 is valid value? In the beginning of description, I wrote "positive number"