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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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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...
Using Java and backtracking:
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 ?