[dekhn]

If you omit the decrement, it's an infinite loop for n>1, presumably, you are detecting that?

[bugfix-66]

The server is checking the output of the function.

Here is an example of what's running behind the scenes, to help you understand:

https://bugfix-66.com/contribute

The above code is what's being used for Bug #1:

https://bugfix-66.com/a6cb1e062ae0fdc47b43ec489aa40a958db728...

Is that pretty clear?