Cool! Glad you liked it!

Marking the issue as resolved.

I updated the kata. Thanks.

Fixed.

I managed to approved them by forking them first. I saw merge conflicts in the description, not sure why though. Thanks for the reminder.

I'm sorry about this. I keep getting a merge error when I try to approve them, even when the diff looks fine. It's a shame, I see some of the forks are 2 years old.

Sorry, I missed that one!

At least share an analysis of the complexity of the algorithm or a real benchmarking comparsion :-)

Those are very interesting cases! The basic test cases were a bit intentional in fact, to allow some more creative solutions. Also because it is difficult to precisly describe what is allowed without using a more mathematical language.

There are a lot of potential variations for new Katas based on the same idea.

Glad you liked it!

I don't know without looking at the code, but

    4 years = 126144000 seconds
   67 days  =   5788800 seconds
    3 hours =     10800 seconds
 48 minutes =      2880 seconds
 56 seconds =        56 seconds
 ------------------------------
   Total    =  131946536

that is not 132030240.

The description specifies it is defined for non-negative integers. I could add a test for that, but this Kata is already published but, unless it is an error I would say it is better not to change the tests. Read it like unspecified behavior.