Not broken, Visualize the description carefully

Can confirm

just the expected and acual that are swapped in the code. Yours is in "expected". ;)

Nested loops won't work. indexOf has a loop under the hood.

Not an issue (resolved)

You should test the input.

You need to find a O(1) solution. brute force should not pass ;-)

I've separated the core issue out and filed a bug report. Turns out it's a CW platform bug that's independent of languages:

https://github.com/Codewars/codewars.com/issues/922

If we get some good luck @jhoffner should be able to fix this in a few days.

I've added a comment in the main chat :-) thank you for your suggestion :-)

Interesting problem ;-)
I copied this to other katas and submit. It can not pass the tests.
But in this kata it passed all tests.
Perhaps you can report an issue on gitter, let @jhoffner know.

Hi @skeletoo,

I copied your code and the tests into Visual Studio 2015 and it failed the tests with and without the Console.Write(a[i]); so, I'm not sure why it would pass the tests in here.

I haven't got an explaination for you, sorry.

Maybe @jhoffner, @kazk, @smile67, @Voile, @SteffenVogel_79, @donaldsebleung or @gabbek could help?

Closed :)