This is genius

The problem description is NOT totally correct. it's not how many rats died. We have a total of 10 rats. That's it. These rats are put on position numbered from 0 to 9, so total 10 rats.
1000 bottles of wine are also numbered from 0 to 999. Then each bottle of wine is polled into the glasses in front of the rats according to the binary representation of the bottle number, that is: if the bottle number has bit 1 for position i (0<=i<=9), then poll wine into the glass of that position.
The numbers we received should be the position number of the rats.

Any concrete suggestions?

I should be careful, so sorry for my mistake!

What? I just find an error in the original code and report it. People who did't pass the kata won't see the post and my comment. Did I miss anything?

Spoiler flag!

The description needs to be improved, people feels hard to understand the setting and your notation... I major is math so that is not with me, but I think others may suffer.

Now I know why creator feels upset to cheating LOL

You did it right so far, keep going. Maybe you should play with acos more.

I think it will save time, since we only need to evaluate Counter(word) once.