yep its not doing anything more. was just writing solution quickly and added that as a habit.

agreed! more effort definitely gives nicer feeling at the end! just generally when i have short time i try to solve 7 or 8 kyu katas :')
My math is weak, so i can't wait to solve this and find out what others suggest as better solution..

1kyu spending 2hrs on 7kyu test, thats saying something about the difficulty level!
maybe considering performance part, this should be higher level kata..