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I prefer the ordered version.

three most difficult things in CS:

2) Naming Things

1) Cache Invalidation

4) off by one errors

3) Concurrency

Another version, about distributed systems:

There are only two hard problems in distributed systems:

2. Exactly-once delivery

1. Guaranteed order of messages

2. Exactly-once delivery

two most difficult things in CS:

0) naming things

1) cache invalidation

42) asynchronous callbacks

2) off by one errors

They are likely making a joke about caching the answer

What does HTH mean?

"Hope this helps" (sometimes used sarcastically)

Hope That Help, HTH.

"Hope this helps"

I see it with HAND "have a nice day" too

I've always read it as "Happy To Help".

I see that's wrong, but ignorance has made the internet seem just that little bit warmer all these years!

I think it could probably mean "Happy to help" if said in response to a thanks of some sort. Saying it before someone has said thanks is a bit presumptuous. :-)