Question on problem 29 or rather LINQ

1. I do not know.
2. Try it out.
3. Even if the online parsers / compilers do not support it, you can run it locally on your machine and copy&paste the results and then submit as solution.

That's right :) sorry, here are not that many C# specialists.

I browsed existing solutions for you and tried one of them.

Seems like LINQ is working pretty fine - try yourself!

as using array with bubble sort or selection sort

generally nowadays no one is expected to write sorting or hashtables from scratch. Though you are free to solve any way you like... if site doesn't support something, you still can run solution locally as gardengnome hints and store solution here just for reference.