OP solved it, closing

That isn't an error, the expected result is correct.

:D :D You see, I am from the C/C#-World.....

I'm not sure if it was there when you wrote this comment, but in the description it states: Note: 0! is always equal to 1. Negative values should return null;

Should be good now.

Fixed. Thanks.

That is correct. More accurately, it looks like you didn't pass an argument to the Bomb.CutTheWire().

Yea, I've been noticing this. It's a 406 error. I imagine this is something that can happen if you're attempting to manage multiple subdomains. I imagine the best way to go about it would be a Redirect to www.codewars.com

I believe it will automatically do it

It was a single incident, I haven't tried again since. I switched to daylight mode and used it for a couple minutes and then closed the page. Also, it is good to be back - that 1 kyu has been calling me...

:)

You clicked on daylight mode before closing the page? Was this a single incident or does it always happen? Good to see you back in action BTW.

The issue has been fixed. I didn't notice my solution used for testing was joining the array's to remove overlapping intervals. Thanks for the heads up!

I was training on a kata, submitted, closed the page, then went back directly to the kata's training url and my day mode was not retained and the night mode was active.

This should be fixed now