Dammit I keep overcomplicating these tasks by needlessly employing loops and control flow XD

Python solve 60000000 in 0.00011420249938964844 second on local computer(2013 version Mac Air).

time squaresums.sh 60000000 -> 1, 9, 99, 10954, 59999999 == real 0m0.027s
actually solvable in under 90 mins using a shell script thats about 50x 'better' than 12s.
dudes...

If $1 has spaces you might not get what you expect. Also, it's possible to hit the max command length with this as well.

Using Java and backtracking:

• assertEquals("1 9 99 10954 59999999", d.decompose(60000000));
• Completed in 309.329094 ms (92ms on my own comp)

I can't see your solution, so I can't really say, but this is not a very complex kata.

1s 242ms with me. why 12s ?

Looks nice, but what if directory have a name *.png?

Didn't you have a "#include /cmath/" ('/' instead of '<' because it doesn't show up) in your code?
Otherwise uncomment it in the "Example tests" if it is still commented.
Edit: I just uncommented it.

I think there should be a test that uses the result of a funciton call as an operand. E.g.:

>2 + avg 1 3
    4